我用 GUI 创建了一个简单的猜谜游戏。问题是，每当我最大化窗口时，整个 GUI 都会卡在顶部中间。我想知道如何将其居中以及如何使其变大。代码如下:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class GuessingGameNew implements ActionListener {
private final double VERSION = 2.3;
//Initializing Main Window and Difficulty Window
JFrame window = new JFrame("Guess The Number " + VERSION);
JFrame DiffFrame = new JFrame("Difficulty");
JButton btnNewGame = new JButton("New Game");
JButton btnInstruction = new JButton("Instructions");
JButton btnDifficulty = new JButton("Change Difficulty");
JButton btnAbout = new JButton("About");
JButton btnExit = new JButton("Exit");
JButton btnOK = new JButton("Ok");
JButton btnDiff[] = new JButton[6];
//Making Panel for Main Menu Buttons
JPanel pnlMainMenu = new JPanel();
//Making Panel for Difficulty Buttons
JPanel pnlDifficulty = new JPanel();
int diff = 10;
int tries;
int Secret;
int Guess;
int option = 0;
boolean Cancel = false;
GuessingGameNew() { //constructor
//Setting Main Window properties
window.setSize(400, 300);
window.setLocation(500, 260);
window.setLayout(new FlowLayout(FlowLayout.CENTER));
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DiffFrame.setSize(230, 210);
DiffFrame.setLocation(530, 230);
DiffFrame.setLayout(new BorderLayout());
//MainMenu Panel Layout and adding Main Menu Buttons
// GridLayout(int rows, int columns, int Horizontal_Gap, intVertical_Gap)
pnlMainMenu.setLayout(new GridLayout(5, 1, 2, 8));
pnlMainMenu.add(btnNewGame);
pnlMainMenu.add(btnInstruction);
pnlMainMenu.add(btnDifficulty);
pnlMainMenu.add(btnAbout);
pnlMainMenu.add(btnExit);
pnlMainMenu.setBackground(Color.red);
//Setting Layout for Difficulty Panel
pnlDifficulty.setLayout(new GridLayout(6, 1, 2, 2));
btnDiff[0] = new JButton("Very Easy (0 - 3)");
btnDiff[1] = new JButton("Easy (0 - 50)");
btnDiff[2] = new JButton("Medium (0 - 100)");
btnDiff[3] = new JButton("Hard (0 - 500)");
btnDiff[4] = new JButton("Very Hard (0 - 1000)");
btnDiff[5] = new JButton("Custom (0 - ?)");
btnNewGame.addActionListener(this);
btnInstruction.addActionListener(this);
btnDifficulty.addActionListener(this);
btnAbout.addActionListener(this);
btnExit.addActionListener(this);
btnOK.addActionListener(this);
for(int i=0; i<6; i++) {
btnDiff[i].addActionListener(this);
pnlDifficulty.add(btnDiff[i]);
}
window.add(pnlMainMenu);
window.setVisible(true);
}
public void actionPerformed(ActionEvent click) {
System.out.println("Action Performed");
if(click.getSource() == btnNewGame) {
NewGame();
}
if(click.getSource() == btnExit) {
option = JOptionPane.showConfirmDialog(null, "Are you sure you want to exit?", "Exit Game" ,JOptionPane.YES_NO_OPTION);
if(option == JOptionPane.YES_OPTION)
System.exit(0);
}
if(click.getSource() == btnInstruction) {
JOptionPane.showMessageDialog(null,
"Game:" + "\nClick New Game to start a new game.\nGuess a number between 0 and the selected number. Keep Guessing until you get it correct."
+ "\n\nDifficulty:" + "\nYou can change the difficulty of the game\n in the Main Menu to a Custom range or a \npreset range."
, "Instructions", JOptionPane.INFORMATION_MESSAGE);
}
if(click.getSource() == btnAbout) {
JOptionPane.showMessageDialog(null,JOptionPane.INFORMATION_MESSAGE);
}
if(click.getSource() == btnDifficulty) {
Change_Difficulty();
}
for(int i=0; i<6; i++) {
if(click.getSource() == btnDiff[i]) {
if(click.getSource() == btnDiff[0])
diff = 3;
if(click.getSource() == btnDiff[1])
diff = 50;
if(click.getSource() == btnDiff[2])
diff = 100;
if(click.getSource() == btnDiff[3])
diff = 500;
if(click.getSource() == btnDiff[4])
diff = 1000;
if(click.getSource() == btnDiff[5])
diff = Custom();
DiffFrame.setVisible(false);
}
}
}
public void NewGame() {
tries = 1;
Guess = 101;
Secret = (int)((Math.random()) * (diff + 1));
Cancel = false;
while(Guess != Secret) {
try {
if(tries == 1) {
Guess = Integer.parseInt(JOptionPane.showInputDialog(null, "Try: 1" + "\nGuess a number between 0 and " + diff, "Guess?", JOptionPane.PLAIN_MESSAGE));
tries++;
} else {
if(Guess > Secret)
Guess = Integer.parseInt(JOptionPane.showInputDialog(null, "Try: " + tries + "\n" + Guess + "\nGuess Lower..."));
else if(Guess < Secret)
Guess = Integer.parseInt(JOptionPane.showInputDialog(null, "Try: " + tries + "\n" + Guess + "\nGuess Higher..."));
tries++;
}
} catch(NumberFormatException e) {
if(e.getMessage() == "null") {
option = JOptionPane.showConfirmDialog(null, "Are you sure you want to go back to the Main Menu?", "Cancel?", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);
if(option == JOptionPane.YES_OPTION) {
Cancel = true;
break;
}
}
JOptionPane.showMessageDialog(null, "Error: " + e.getMessage() + "\nEnter whole numbers only!");
}
}
if(!Cancel) {
tries--;
JOptionPane.showMessageDialog(null, Guess + " is Correct!!\nYou WON in " + tries + " tries.", "Winner", JOptionPane.INFORMATION_MESSAGE);
option = JOptionPane.showConfirmDialog(null, "Do you want to try again?", "Try Again?", JOptionPane.YES_NO_OPTION, JOptionPane.PLAIN_MESSAGE);
if(option == JOptionPane.YES_OPTION)
NewGame();
}
}
public void Change_Difficulty() {
DiffFrame.add(pnlDifficulty, BorderLayout.CENTER);
DiffFrame.setVisible(true);
}
public int Custom() {
try {
diff = Integer.parseInt(JOptionPane.showInputDialog(null, "Enter a number that you want to be the range (0 to ?)", diff));
} catch(NumberFormatException e) {
}
return diff;
}
public static void main(String[] args) {
new GuessingGameNew();
}
}
最佳答案
您正在设置 FlowLayout :
window.setLayout(new FlowLayout(FlowLayout.CENTER));
此布局没有垂直对齐的概念，只有在超出水平空间时才会换行其内容。设置对齐方式仅适用于水平行为。
I would like to know how to center it in the middle and how to make it bigger.
如果删除该行，则默认的 CENTER 位置 BorderLayout将使用，它水平和垂直居中并拉伸(stretch)组件:
关于java - 居中 GUI，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45111156/