我这里有一个相当大的设置，但它仍然是一个 WIP。现在我想让我的 GUI 正确显示，并通过单击按钮在面板之间切换。在我的 GUI() 方法中，我使用组布局设置了各种面板。在类(class)结束时，您会注意到我想用来设置各种面板可见或不可见的方法。 LoginP 是我运行代码时想要看到的面板，所以我在 GUI() 方法的末尾调用相应的方法，但由于某种奇怪的原因，当我运行时，就好像根本没有面板一样，只是一个空白的 JFrame。我添加了一个 System.out.println();就在我调用将 LoginP 设置为可见的方法之后(在 GUI() 方法的末尾)，但可惜的是，该行没有打印出来。我确信答案就在我眼前，但我就是看不到。
编辑:对于那些想玩一下的人，这里是所有源文件:http://goo.gl/KjW8cH
//Individual Imports
/*
import java.awt.GroupLayout;
import java.awt.Font;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.JCheckBox;
import javax.swing.JOptionPane;
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
public class GUI extends JFrame
{
/*#################################################################################################################################################################
*#####################################################################################################################################################
*###############################################################################################################################################################*/
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Login Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private JPanel loginP;
private JLabel titleL;
private JLabel instructL;
private JLabel usernameL;
private JLabel passwordL;
private JLabel loginL;
private JButton studentB;
private JButton lecturerB;
private JTextField usernameTF;
private JTextField passwordTF;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Add Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ private JPanel addQP;
private JPanel addQP;
private JLabel instructionsL;
private JLabel txtL;
private JLabel infoL;
private JButton appendB;
private JButton overwriteB;
private JTextField pathTF;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private JPanel questionP;
private JLabel qNumL;
private JLabel groupL;
private JLabel questionL;
private JLabel opt1L;
private JLabel opt2L;
private JLabel opt3L;
private JLabel opt4L;
private JButton opt1B;
private JButton opt2B;
private JButton opt3B;
private JButton opt4B;
String qNumber = "3";
String group = "JDBC";
String question = "This is the question";
String opt1 = "This is option 1";
String opt2 = "This is option 2";
String opt3 = "This is option 3";
String opt4 = "This is option 4";
String a = "a.";
String b = "b.";
String c = "c.";
String d = "d.";
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Viewer Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private JPanel viewerP;
private JLabel aL;
private JLabel bL;
private JLabel cL;
private JLabel dL;
private JButton nextB;
private JButton closeB;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Select Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private JPanel selectQP;
private JLabel instruct1L;
private JLabel askL;
private JCheckBox checkBox1;
private JCheckBox checkBox2;
private JCheckBox checkBox3;
private JCheckBox checkBox4;
private JButton viewB;
private JButton startB;
private JTextField numOfQTF;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mark Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private JPanel markP;
private JLabel percentageL;
private JLabel outOfL;
private JButton backB;
private JButton logOutB;
Connection con;
Statement stmt;
ResultSet rs;
/*#################################################################################################################################################################
*#########################################################################Panels##################################################################################
*###############################################################################################################################################################*/
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Login Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
public GUI()
{
super("Tester");
setLayout(new FlowLayout());
loginP = new JPanel();
add(loginP);
GroupLayout loginPLayout = new GroupLayout(loginP);
loginP.setLayout(loginPLayout);
loginPLayout.setAutoCreateGaps(true);
loginPLayout.setAutoCreateContainerGaps(true);
Font font = new Font("Freestyle Script", Font.PLAIN,80);
titleL = new JLabel("Tester");
titleL.setFont(font);
instructL = new JLabel("Please eneter your name and password and select your login type to login.");
usernameL = new JLabel("Username:");
passwordL = new JLabel("Password:");
loginL = new JLabel("Login as");
studentB = new JButton("Student");
lecturerB = new JButton("Lecturer");
usernameTF = new JTextField("", 100);
passwordTF = new JTextField("", 100);
studentB.addActionListener(new studentH());
lecturerB.addActionListener(new lecturerH());
loginPLayout.setHorizontalGroup(loginPLayout.createSequentialGroup()
.addGroup(loginPLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(usernameL)
.addComponent(passwordL))
.addGroup(loginPLayout.createParallelGroup(GroupLayout.Alignment.CENTER)
.addComponent(titleL)
.addComponent(instructL)
.addComponent(usernameTF)
.addComponent(passwordTF)
.addComponent(loginL)
.addGroup(loginPLayout.createSequentialGroup()
.addComponent(studentB)
.addComponent(lecturerB)))
);
loginPLayout.setVerticalGroup(loginPLayout.createSequentialGroup()
.addComponent(titleL)
.addComponent(instructL)
.addGroup(loginPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(usernameL)
.addComponent(usernameTF))
.addGroup(loginPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(passwordL)
.addComponent(passwordTF))
.addComponent(loginL)
.addGroup(loginPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(studentB)
.addComponent(lecturerB))
);
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Select Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
selectQP = new JPanel();
add(selectQP);
GroupLayout selectQPLayout = new GroupLayout(selectQP);
selectQP.setLayout(selectQPLayout);
selectQPLayout.setAutoCreateGaps(true);
selectQPLayout.setAutoCreateContainerGaps(true);
String cat1 = "Collections";
String cat2 = "Multithreading";
String cat3 = "Networking";
String cat4 = "JDBC";
instruct1L = new JLabel("Select the groups of questions you would like to be tested on");
askL = new JLabel("How many questions would you like?");
checkBox1 = new JCheckBox(cat1);
checkBox2 = new JCheckBox(cat2);
checkBox3 = new JCheckBox(cat3);
checkBox4 = new JCheckBox(cat4);
viewB = new JButton("View Questions");
startB = new JButton("Start Test");
numOfQTF = new JTextField("", 100);
viewB.addActionListener(new viewH());
startB.addActionListener(new startH());
selectQPLayout.setHorizontalGroup(selectQPLayout.createParallelGroup()
.addComponent(instruct1L)
.addComponent(checkBox1)
.addComponent(checkBox2)
.addComponent(checkBox3)
.addComponent(checkBox4)
.addComponent(askL)
.addComponent(numOfQTF)
.addGroup(selectQPLayout.createSequentialGroup()
.addComponent(viewB)
.addComponent(startB))
);
selectQPLayout.setVerticalGroup(selectQPLayout.createSequentialGroup()
.addComponent(instruct1L)
.addComponent(checkBox1)
.addComponent(checkBox2)
.addComponent(checkBox3)
.addComponent(checkBox4)
.addComponent(askL)
.addComponent(numOfQTF)
.addGroup(selectQPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(viewB)
.addComponent(startB))
);
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Add Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
addQP = new JPanel();
add(addQP);
GroupLayout addQPLayout = new GroupLayout(addQP);
addQP.setLayout(addQPLayout);
addQPLayout.setAutoCreateGaps(true);
addQPLayout.setAutoCreateContainerGaps(true);
instructionsL = new JLabel("Please enter the name of the file:");
txtL = new JLabel(".txt");
infoL = new JLabel("You will be logged out after the questions have been added.");
appendB = new JButton("Append Questions");
overwriteB = new JButton("Overwrite Questions");
pathTF = new JTextField("", 100);
appendB.addActionListener(new appendH());
overwriteB.addActionListener(new overwriteH());
addQPLayout.setHorizontalGroup(addQPLayout.createSequentialGroup()
.addGroup(addQPLayout.createParallelGroup(GroupLayout.Alignment.CENTER)
.addComponent(instructionsL)
.addGroup(addQPLayout.createSequentialGroup()
.addComponent(pathTF)
.addComponent(txtL))
.addComponent(infoL)
.addGroup(addQPLayout.createSequentialGroup()
.addComponent(appendB)
.addComponent(overwriteB)))
);
addQPLayout.setVerticalGroup(addQPLayout.createSequentialGroup()
.addComponent(instructionsL)
.addGroup(addQPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(pathTF)
.addComponent(txtL))
.addComponent(infoL)
.addGroup(addQPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(appendB)
.addComponent(overwriteB))
);
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
qNumL = new JLabel("Question Number: " + qNumber);
groupL = new JLabel("Group: " + group);
questionL = new JLabel(question);
opt1L = new JLabel(opt1);
opt2L = new JLabel(opt2);
opt3L = new JLabel(opt3);
opt4L = new JLabel(opt4);
opt1B = new JButton("A");
opt2B = new JButton("B");
opt3B = new JButton("C");
opt4B = new JButton("D");
questionP = new JPanel();
add(questionP);
GroupLayout questionPLayout = new GroupLayout(questionP);
questionP.setLayout(questionPLayout);
questionPLayout.setAutoCreateGaps(true);
questionPLayout.setAutoCreateContainerGaps(true);
optH handler = new optH();
opt1B.addActionListener(handler);
//opt2B.addActionListener(handler);
//opt3B.addActionListener(handler);
//opt4B.addActionListener(handler);
questionPLayout.setHorizontalGroup(questionPLayout.createSequentialGroup()
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(qNumL)
.addComponent(questionL)
.addComponent(opt1B)
.addComponent(opt2B)
.addComponent(opt3B)
.addComponent(opt4B))
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(opt1L)
.addComponent(opt2L)
.addComponent(opt3L)
.addComponent(opt4L))
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.TRAILING)
.addComponent(groupL))
);
questionPLayout.setVerticalGroup(questionPLayout.createSequentialGroup()
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(qNumL)
.addComponent(groupL))
.addComponent(questionL)
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(opt1B)
.addComponent(opt1L))
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(opt2B)
.addComponent(opt2L))
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(opt3B)
.addComponent(opt3L))
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(opt4B)
.addComponent(opt4L))
);
showLoginP();
System.out.println("Im here");
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Viewer Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
qNumL = new JLabel("Question Number: " + qNumber);
groupL = new JLabel("Group: " + group);
questionL = new JLabel(question);
aL = new JLabel("A");
bL = new JLabel("B");
cL = new JLabel("C");
dL = new JLabel("D");
opt1L = new JLabel(opt1);
opt2L = new JLabel(opt2);
opt3L = new JLabel(opt3);
opt4L = new JLabel(opt4);
nextB = new JButton("Next");
closeB = new JButton("Close");
viewerP = new JPanel();
add(viewerP);
GroupLayout viewerPLayout = new GroupLayout(viewerP);
viewerP.setLayout(viewerPLayout);
viewerPLayout.setAutoCreateGaps(true);
viewerPLayout.setAutoCreateContainerGaps(true);
viewerPLayout.setHorizontalGroup(viewerPLayout.createSequentialGroup()
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(qNumL)
.addComponent(questionL)
.addComponent(aL)
.addComponent(bL)
.addComponent(cL)
.addComponent(dL))
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(opt1L)
.addComponent(opt2L)
.addComponent(opt3L)
.addComponent(opt4L))
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.TRAILING)
.addComponent(groupL)
.addGroup(viewerPLayout.createSequentialGroup()
.addComponent(nextB)
.addComponent(closeB)))
);
viewerPLayout.setVerticalGroup(viewerPLayout.createSequentialGroup()
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(qNumL)
.addComponent(groupL))
.addComponent(questionL)
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(aL)
.addComponent(opt1L))
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(bL)
.addComponent(opt2L))
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(cL)
.addComponent(opt3L))
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(dL)
.addComponent(opt4L))
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(nextB)
.addComponent(closeB))
);
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mark Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
markP = new JPanel();
add(markP);
GroupLayout markPLayout = new GroupLayout(markP);
markP.setLayout(markPLayout);
markPLayout.setAutoCreateGaps(true);
markPLayout.setAutoCreateContainerGaps(true);
int percentage = 90;
int correct = 9;
int total = 10;
percentageL = new JLabel("You scored: " + percentage + "%");
outOfL = new JLabel("You have " + correct + " corret answers out of a possible " + total);
backB = new JButton("Back to Group Selection");
logOutB = new JButton("Log Out");
backB.addActionListener(new backH());
logOutB.addActionListener(new logOutH());
markPLayout.setHorizontalGroup(markPLayout.createParallelGroup()
.addComponent(percentageL)
.addComponent(outOfL)
.addGroup(markPLayout.createSequentialGroup()
.addComponent(backB)
.addComponent(logOutB))
);
markPLayout.setVerticalGroup(markPLayout.createSequentialGroup()
.addComponent(percentageL)
.addComponent(outOfL)
.addGroup(markPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(backB)
.addComponent(logOutB))
);
}
showLoginP();
System.out.println("Im here");
/*#################################################################################################################################################################
*#####################################################################Action Listeners############################################################################
*###############################################################################################################################################################*/
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Login Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private class studentH implements ActionListener
{
@Override
public void actionPerformed(ActionEvent event)
{
Student stu = new Student();
String username = usernameTF.getText();
String password = passwordTF.getText();
boolean correct = stu.Student(username, password);
if(correct == true)
{
showSelectQP();
}
else
{
JOptionPane.showMessageDialog(null, "You have entered incorect details. Please try again", "Incorrect Details", JOptionPane.ERROR_MESSAGE);
usernameTF.setText("");
passwordTF.setText("");
}
}
}
private class lecturerH implements ActionListener
{
@Override
public void actionPerformed(ActionEvent event)
{
Lecturer lect = new Lecturer();
String username = usernameTF.getText();
String password = passwordTF.getText();
boolean correct = lect.Lecturer(username, password);
if(correct == true)
{
showAddQP();
}
else
{
JOptionPane.showMessageDialog(null, "You have entered incorect details. Please try again", "Incorrect Details", JOptionPane.ERROR_MESSAGE);
usernameTF.setText("");
passwordTF.setText("");
}
}
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Add Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private class appendH implements ActionListener
{
@Override
public void actionPerformed(ActionEvent event)
{
//Append appen = new Append();
String path = pathTF.getText();
//appen.Append(path);
}
}
private class overwriteH implements ActionListener
{
@Override
public void actionPerformed(ActionEvent event)
{
Overwrite over = new Overwrite();
}
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private class optH implements ActionListener
{
@Override
public void actionPerformed( ActionEvent event )
{
}
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Select Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private class viewH implements ActionListener
{
@Override
public void actionPerformed( ActionEvent event )
{
}
}
private class startH implements ActionListener
{
@Override
public void actionPerformed( ActionEvent event )
{
}
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mark Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private class backH implements ActionListener
{
@Override
public void actionPerformed( ActionEvent event )
{
}
}
private class logOutH implements ActionListener
{
@Override
public void actionPerformed( ActionEvent event )
{
}
}
public void showLoginP()
{
addQP.setVisible(false);
questionP.setVisible(false);
viewerP.setVisible(false);
markP.setVisible(false);
selectQP.setVisible(false);
loginP.setVisible(true);
revalidate();
repaint();
}
public void showAddQP()
{
questionP.setVisible(false);
viewerP.setVisible(false);
markP.setVisible(false);
selectQP.setVisible(false);
loginP.setVisible(false);
addQP.setVisible(true);
}
public void showQuestionP()
{
addQP.setVisible(false);
viewerP.setVisible(false);
markP.setVisible(false);
selectQP.setVisible(false);
loginP.setVisible(false);
questionP.setVisible(true);
}
public void showViewerP()
{
addQP.setVisible(false);
questionP.setVisible(false);
markP.setVisible(false);
selectQP.setVisible(false);
loginP.setVisible(false);
viewerP.setVisible(true);
}
public void showMarkP()
{
addQP.setVisible(false);
questionP.setVisible(false);
viewerP.setVisible(false);
selectQP.setVisible(false);
loginP.setVisible(false);
markP.setVisible(true);
}
public void showSelectQP()
{
addQP.setVisible(false);
//questionP.setVisible(false);
viewerP.setVisible(false);
markP.setVisible(false);
loginP.setVisible(false);
selectQP.setVisible(true);
}
}
最佳答案
这不会回答你的问题，但这里发生了很多事情，我将一次只讨论一部分。首先，不要将 main 方法放在另一个类中，确实没有理由这么做。将其添加到现有的 GUI 类中并删除其他类:
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
GUI gui = new GUI();
gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gui.setSize(600, 400);
gui.setResizable(true);
gui.setVisible(true);
}
});
}
我建议在构造函数上方这样做，这样很容易找到。
编辑:这是一个使用卡片布局的版本。不客气。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
public class GUI extends JFrame {
JComboBox<String> comboBox;
private JPanel cardPanel;
/*#################################################################################################################################################################
*########################################################################Constructors#############################################################################
*###############################################################################################################################################################*/
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Login Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private JPanel loginP;
private JLabel titleL;
private JLabel instructL;
private JLabel usernameL;
private JLabel passwordL;
private JLabel loginL;
private JButton studentB;
private JButton lecturerB;
private JTextField usernameTF;
private JTextField passwordTF;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Add Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ private JPanel addQP;
private JPanel addQP;
private JLabel instructionsL;
private JLabel txtL;
private JLabel infoL;
private JButton appendB;
private JButton overwriteB;
private JTextField pathTF;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private JPanel questionP;
private JLabel qNumL;
private JLabel groupL;
private JLabel questionL;
private JLabel opt1L;
private JLabel opt2L;
private JLabel opt3L;
private JLabel opt4L;
private JButton opt1B;
private JButton opt2B;
private JButton opt3B;
private JButton opt4B;
String qNumber = "3";
String group = "JDBC";
String question = "This is the question";
String opt1 = "This is option 1";
String opt2 = "This is option 2";
String opt3 = "This is option 3";
String opt4 = "This is option 4";
String a = "a.";
String b = "b.";
String c = "c.";
String d = "d.";
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Viewer Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private JPanel viewerP;
private JLabel aL;
private JLabel bL;
private JLabel cL;
private JLabel dL;
private JButton nextB;
private JButton closeB;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Select Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private JPanel selectQP;
private JLabel instruct1L;
private JLabel askL;
private JCheckBox checkBox1;
private JCheckBox checkBox2;
private JCheckBox checkBox3;
private JCheckBox checkBox4;
private JButton viewB;
private JButton startB;
private JTextField numOfQTF;
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mark Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private JPanel markP;
private JLabel percentageL;
private JLabel outOfL;
private JButton backB;
private JButton logOutB;
Connection con;
Statement stmt;
ResultSet rs;
/*#################################################################################################################################################################
*#########################################################################Panels##################################################################################
*###############################################################################################################################################################*/
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Login Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
GUI gui = new GUI();
gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gui.setSize(600, 400);
gui.setResizable(true);
gui.setVisible(true);
}
});
}
public GUI() {
super("Tester");
loginP = new JPanel();
GroupLayout loginPLayout = new GroupLayout(loginP);
loginP.setLayout(loginPLayout);
loginPLayout.setAutoCreateGaps(true);
loginPLayout.setAutoCreateContainerGaps(true);
Font font = new Font("Freestyle Script", Font.PLAIN,80);
titleL = new JLabel("Tester");
titleL.setFont(font);
instructL = new JLabel("Please eneter your name and password and select your login type to login.");
usernameL = new JLabel("Username:");
passwordL = new JLabel("Password:");
loginL = new JLabel("Login as");
studentB = new JButton("Student");
lecturerB = new JButton("Lecturer");
usernameTF = new JTextField("", 100);
passwordTF = new JTextField("", 100);
studentB.addActionListener(new studentH());
lecturerB.addActionListener(new lecturerH());
loginPLayout.setHorizontalGroup(loginPLayout.createSequentialGroup()
.addGroup(loginPLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(usernameL)
.addComponent(passwordL))
.addGroup(loginPLayout.createParallelGroup(GroupLayout.Alignment.CENTER)
.addComponent(titleL)
.addComponent(instructL)
.addComponent(usernameTF)
.addComponent(passwordTF)
.addComponent(loginL)
.addGroup(loginPLayout.createSequentialGroup()
.addComponent(studentB)
.addComponent(lecturerB)))
);
loginPLayout.setVerticalGroup(loginPLayout.createSequentialGroup()
.addComponent(titleL)
.addComponent(instructL)
.addGroup(loginPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(usernameL)
.addComponent(usernameTF))
.addGroup(loginPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(passwordL)
.addComponent(passwordTF))
.addComponent(loginL)
.addGroup(loginPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(studentB)
.addComponent(lecturerB))
);
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Select Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
selectQP = new JPanel();
GroupLayout selectQPLayout = new GroupLayout(selectQP);
selectQP.setLayout(selectQPLayout);
selectQPLayout.setAutoCreateGaps(true);
selectQPLayout.setAutoCreateContainerGaps(true);
String cat1 = "Collections";
String cat2 = "Multithreading";
String cat3 = "Networking";
String cat4 = "JDBC";
instruct1L = new JLabel("Select the groups of questions you would like to be tested on");
askL = new JLabel("How many questions would you like?");
checkBox1 = new JCheckBox(cat1);
checkBox2 = new JCheckBox(cat2);
checkBox3 = new JCheckBox(cat3);
checkBox4 = new JCheckBox(cat4);
viewB = new JButton("View Questions");
startB = new JButton("Start Test");
numOfQTF = new JTextField("", 100);
viewB.addActionListener(new viewH());
startB.addActionListener(new startH());
selectQPLayout.setHorizontalGroup(selectQPLayout.createParallelGroup()
.addComponent(instruct1L)
.addComponent(checkBox1)
.addComponent(checkBox2)
.addComponent(checkBox3)
.addComponent(checkBox4)
.addComponent(askL)
.addComponent(numOfQTF)
.addGroup(selectQPLayout.createSequentialGroup()
.addComponent(viewB)
.addComponent(startB))
);
selectQPLayout.setVerticalGroup(selectQPLayout.createSequentialGroup()
.addComponent(instruct1L)
.addComponent(checkBox1)
.addComponent(checkBox2)
.addComponent(checkBox3)
.addComponent(checkBox4)
.addComponent(askL)
.addComponent(numOfQTF)
.addGroup(selectQPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(viewB)
.addComponent(startB))
);
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Add Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
addQP = new JPanel();
GroupLayout addQPLayout = new GroupLayout(addQP);
addQP.setLayout(addQPLayout);
addQPLayout.setAutoCreateGaps(true);
addQPLayout.setAutoCreateContainerGaps(true);
instructionsL = new JLabel("Please enter the name of the file:");
txtL = new JLabel(".txt");
infoL = new JLabel("You will be logged out after the questions have been added.");
appendB = new JButton("Append Questions");
overwriteB = new JButton("Overwrite Questions");
pathTF = new JTextField("", 100);
appendB.addActionListener(new appendH());
overwriteB.addActionListener(new overwriteH());
addQPLayout.setHorizontalGroup(addQPLayout.createSequentialGroup()
.addGroup(addQPLayout.createParallelGroup(GroupLayout.Alignment.CENTER)
.addComponent(instructionsL)
.addGroup(addQPLayout.createSequentialGroup()
.addComponent(pathTF)
.addComponent(txtL))
.addComponent(infoL)
.addGroup(addQPLayout.createSequentialGroup()
.addComponent(appendB)
.addComponent(overwriteB)))
);
addQPLayout.setVerticalGroup(addQPLayout.createSequentialGroup()
.addComponent(instructionsL)
.addGroup(addQPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(pathTF)
.addComponent(txtL))
.addComponent(infoL)
.addGroup(addQPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(appendB)
.addComponent(overwriteB))
);
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
qNumL = new JLabel("Question Number: " + qNumber);
groupL = new JLabel("Group: " + group);
questionL = new JLabel(question);
opt1L = new JLabel(opt1);
opt2L = new JLabel(opt2);
opt3L = new JLabel(opt3);
opt4L = new JLabel(opt4);
opt1B = new JButton("A");
opt2B = new JButton("B");
opt3B = new JButton("C");
opt4B = new JButton("D");
questionP = new JPanel();
// add(questionP);
GroupLayout questionPLayout = new GroupLayout(questionP);
questionP.setLayout(questionPLayout);
questionPLayout.setAutoCreateGaps(true);
questionPLayout.setAutoCreateContainerGaps(true);
optH handler = new optH();
opt1B.addActionListener(handler);
//opt2B.addActionListener(handler);
//opt3B.addActionListener(handler);
//opt4B.addActionListener(handler);
questionPLayout.setHorizontalGroup(questionPLayout.createSequentialGroup()
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(qNumL)
.addComponent(questionL)
.addComponent(opt1B)
.addComponent(opt2B)
.addComponent(opt3B)
.addComponent(opt4B))
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(opt1L)
.addComponent(opt2L)
.addComponent(opt3L)
.addComponent(opt4L))
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.TRAILING)
.addComponent(groupL))
);
questionPLayout.setVerticalGroup(questionPLayout.createSequentialGroup()
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(qNumL)
.addComponent(groupL))
.addComponent(questionL)
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(opt1B)
.addComponent(opt1L))
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(opt2B)
.addComponent(opt2L))
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(opt3B)
.addComponent(opt3L))
.addGroup(questionPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(opt4B)
.addComponent(opt4L))
);
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Viewer Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
qNumL = new JLabel("Question Number: " + qNumber);
groupL = new JLabel("Group: " + group);
questionL = new JLabel(question);
aL = new JLabel("A");
bL = new JLabel("B");
cL = new JLabel("C");
dL = new JLabel("D");
opt1L = new JLabel(opt1);
opt2L = new JLabel(opt2);
opt3L = new JLabel(opt3);
opt4L = new JLabel(opt4);
nextB = new JButton("Next");
closeB = new JButton("Close");
viewerP = new JPanel();
GroupLayout viewerPLayout = new GroupLayout(viewerP);
viewerP.setLayout(viewerPLayout);
viewerPLayout.setAutoCreateGaps(true);
viewerPLayout.setAutoCreateContainerGaps(true);
viewerPLayout.setHorizontalGroup(viewerPLayout.createSequentialGroup()
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(qNumL)
.addComponent(questionL)
.addComponent(aL)
.addComponent(bL)
.addComponent(cL)
.addComponent(dL))
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(opt1L)
.addComponent(opt2L)
.addComponent(opt3L)
.addComponent(opt4L))
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.TRAILING)
.addComponent(groupL)
.addGroup(viewerPLayout.createSequentialGroup()
.addComponent(nextB)
.addComponent(closeB)))
);
viewerPLayout.setVerticalGroup(viewerPLayout.createSequentialGroup()
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(qNumL)
.addComponent(groupL))
.addComponent(questionL)
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(aL)
.addComponent(opt1L))
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(bL)
.addComponent(opt2L))
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(cL)
.addComponent(opt3L))
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(dL)
.addComponent(opt4L))
.addGroup(viewerPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(nextB)
.addComponent(closeB))
);
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mark Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
markP = new JPanel();
GroupLayout markPLayout = new GroupLayout(markP);
markP.setLayout(markPLayout);
markPLayout.setAutoCreateGaps(true);
markPLayout.setAutoCreateContainerGaps(true);
int percentage = 90;
int correct = 9;
int total = 10;
percentageL = new JLabel("You scored: " + percentage + "%");
outOfL = new JLabel("You have " + correct + " corret answers out of a possible " + total);
backB = new JButton("Back to Group Selection");
logOutB = new JButton("Log Out");
backB.addActionListener(new backH());
logOutB.addActionListener(new logOutH());
markPLayout.setHorizontalGroup(markPLayout.createParallelGroup()
.addComponent(percentageL)
.addComponent(outOfL)
.addGroup(markPLayout.createSequentialGroup()
.addComponent(backB)
.addComponent(logOutB))
);
markPLayout.setVerticalGroup(markPLayout.createSequentialGroup()
.addComponent(percentageL)
.addComponent(outOfL)
.addGroup(markPLayout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(backB)
.addComponent(logOutB))
);
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Card Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cardPanel = new JPanel(new CardLayout(0,0));
JPanel[] cards = new JPanel[6];
String[] titles = new String[6];
cards[0] = loginP;
cards[1] = selectQP;
cards[2] = addQP;
cards[3] = questionP;
cards[4] = viewerP;
cards[5] = markP;
titles[0] = "loginP";
titles[1] = "selectQP";
titles[2] = "addQP";
titles[3] = "questionP";
titles[4] = "viewerP";
titles[5] = "markP";
for(int i = 0; i < cards.length; i++) {
cardPanel.add(cards[i], titles[i]);
}
//You can remove this once you are satisfied card layout works with your buttons - this is just for the combobox I added
setLayout(new BorderLayout());
add(cardPanel, BorderLayout.CENTER);
comboBox = new JComboBox<>(titles);
comboBox.addActionListener(new CardListener());
add(comboBox, BorderLayout.NORTH);
//Add this back in once you remove the rest
// add(cardPanel);
pack();
}
//You can remove this once you are satisfied card layout works with your buttons - this is just for the combobox I added
private class CardListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
CardLayout c1 = (CardLayout)(cardPanel.getLayout());
c1.show(cardPanel, (String)comboBox.getSelectedItem());
}
}
/*#################################################################################################################################################################
*#####################################################################Action Listeners############################################################################
*###############################################################################################################################################################*/
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Login Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private class studentH implements ActionListener {
@Override
public void actionPerformed(ActionEvent event) {
Student stu = new Student();
String username = usernameTF.getText();
String password = passwordTF.getText();
boolean correct = stu.Student(username, password);
if(correct == true) {
changeCard("selectQP");
}
else {
JOptionPane.showMessageDialog(null, "You have entered incorect details. Please try again", "Incorrect Details", JOptionPane.ERROR_MESSAGE);
usernameTF.setText("");
passwordTF.setText("");
}
}
}
private class lecturerH implements ActionListener {
@Override
public void actionPerformed(ActionEvent event) {
Lecturer lect = new Lecturer();
String username = usernameTF.getText();
String password = passwordTF.getText();
boolean correct = lect.Lecturer(username, password);
if(correct == true) {
changeCard("addQP");
}
else {
JOptionPane.showMessageDialog(null, "You have entered incorect details. Please try again", "Incorrect Details", JOptionPane.ERROR_MESSAGE);
usernameTF.setText("");
passwordTF.setText("");
}
}
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Add Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private class appendH implements ActionListener {
@Override
public void actionPerformed(ActionEvent event) {
//Append appen = new Append();
String path = pathTF.getText();
//appen.Append(path);
}
}
private class overwriteH implements ActionListener {
@Override
public void actionPerformed(ActionEvent event) {
// Overwrite over = new Overwrite();
}
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private class optH implements ActionListener {
@Override
public void actionPerformed( ActionEvent event ) {
}
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Select Question Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private class viewH implements ActionListener {
@Override
public void actionPerformed( ActionEvent event ) {
}
}
private class startH implements ActionListener {
@Override
public void actionPerformed( ActionEvent event ) {
}
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mark Panel ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private class backH implements ActionListener {
@Override
public void actionPerformed( ActionEvent event ) {
}
}
private class logOutH implements ActionListener {
@Override
public void actionPerformed( ActionEvent event ) {
}
}
private void changeCard(String newCardName) {
CardLayout c1 = (CardLayout)(cardPanel.getLayout());
c1.show(cardPanel, newCardName);
}
}
关于java - JFrame/JPanel 未以组布局显示，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27027220/