我想让 JLabel 答案在用户按下标签时打印出答案。但我发现第 104 行没有使用 HanoisFrames 的“输入”。它继续使用 0 作为“输入”并打印出“0”。我尝试将第 96 行写为 “私有(private)类MouseHandler扩展了HanoisFrames实现了MouseListener，MouseMotionListener”，我使用了“super(int)”，但它不起作用。我该怎么办？
package Hanois;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Hanoi {
private JFrame frame;
JButton[][] buttons= new JButton[3][3];
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Hanoi window = new Hanoi();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public Hanoi() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 901, 696);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuBar menubar=new JMenuBar();//Menu
frame.setJMenuBar(menubar);
JMenu file= new JMenu("File");
file.setFont(new Font("Segoe UI", Font.PLAIN, 21));
menubar.add(file);
JMenuItem exit= new JMenuItem("Exit");//provide users a way to exit
exit.setFont(new Font("Segoe UI", Font.PLAIN, 21));
file.add(exit);
class exitaction implements ActionListener{
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
}
exit.addActionListener(new exitaction());
JPanel panelone = new JPanel();
frame.getContentPane().add(panelone, BorderLayout.CENTER);
panelone.setBackground(Color.WHITE);
panelone.setLayout(new GridLayout(3,4,3,3));
JPanel paneltwo = new JPanel();
frame.getContentPane().add(paneltwo, BorderLayout.NORTH);
paneltwo.setBackground(Color.WHITE);
JLabel lblFunHanoiTower = new JLabel("Fun Hanoi Tower");
frame.getContentPane().add(paneltwo, BorderLayout.NORTH);
lblFunHanoiTower.setForeground(Color.BLACK);
lblFunHanoiTower.setBackground(SystemColor.activeCaption);
lblFunHanoiTower.setFont(new Font("Viner Hand ITC", Font.PLAIN, 36));
paneltwo.add(lblFunHanoiTower);
ActionListener listener =new ActionListener() {
public void actionPerformed(ActionEvent e) {
for(int row = 0; row < buttons.length ; row++) {
for(int col= 0; col < buttons[0].length ;col++) {
if(e.getSource()==buttons[row][col]){
buttons[row][col].setBackground(Color.lightGray);
HanoisFrames f= new HanoisFrames(((row*3)+(col+3)));
f.setVisible(true);//
}
}
}
}
};
for(int row = 0; row < buttons.length ; row++) {
for(int col= 0; col < buttons[0].length ;col++) {
buttons[row][col] = new JButton("level "+String.valueOf((row*3)+(col+3)-2));
buttons[row][col].setFont(new Font("Tempus Sans ITC", Font.BOLD, 32));
buttons[row][col].setBackground(SystemColor.controlHighlight);
buttons[row][col].setSize(6, 6);
buttons[row][col].addActionListener(listener);
panelone.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
panelone.add(buttons[row][col]);
}
}
}
}
package Hanois;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class HanoisFrames extends JFrame {
private JPanel contentPane;
private JButton ret ;
private JButton next;
private JButton last;
private JLabel answer;
private JMenu menu;
private JButton reset;
private JLabel move;
private JPanel panel;
static int input;
private JLabel lblLevel;
boolean showAnswer=false;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
HanoisFrames frame = new HanoisFrames(input);
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public HanoisFrames(int input) {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 901, 696);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
MouseHandler handler=new MouseHandler();
panel = new JPanel();
contentPane.add(panel, BorderLayout.SOUTH);
panel.setLayout(new GridLayout(2,3));
move = new JLabel(" Move");
panel.add(move);
reset = new JButton("Reset");
panel.add(reset);
answer = new JLabel();
answer.setHorizontalAlignment(SwingConstants.CENTER);
panel.add(answer);
answer.setText("Answer");
answer.addMouseListener(handler);
answer.addMouseMotionListener(handler);
last = new JButton("Last");
panel.add(last);
ret = new JButton("Return");
panel.add(ret);
next = new JButton("Next");
panel.add(next);
lblLevel = new JLabel("LEVEL "+ String.valueOf(input-2));
lblLevel.setHorizontalAlignment(SwingConstants.CENTER);
lblLevel.setFont(new Font("Viner Hand ITC", Font.PLAIN, 36));
contentPane.add(lblLevel, BorderLayout.NORTH);
}
public int hanoiCalculator(int input) {
if (input==0){
return 0;
}else if (input==1){
return 1;
}else{
return 2*(hanoiCalculator(input-1)+1)-1;
}
}
private class MouseHandler implements MouseListener,MouseMotionListener {
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
}
public void mousePressed(MouseEvent e) {
answer.setText("Answer: "+String.valueOf(hanoiCalculator(input)).toString());
}
@Override
public void mouseDragged(MouseEvent e) {
// TODO Auto-generated method stub
}
public void mouseMoved(MouseEvent e) {
// TODO Auto-generated method stub
}
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
public void mouseReleased(MouseEvent e) {
answer.setText("Answer: ");
}
}
}
最佳答案
这里:
public class HanoisFrames extends JFrame {
private JPanel contentPane;
// ...
private JPanel panel;
static int input;
您从未在 HanoiFrames 构造函数中设置输入值，因此它仍然是 int 字段的默认值 0。但即使您确实设置了该字段，因为它是静态字段，在任何 HanoiFrames 中对其进行的任何更改class 将更改所有 HanoiFrames 类中的值，因此它不能是静态字段。
因此，将输入声明更改为非静态:
public class HanoisFrames extends JFrame {
private JPanel contentPane;
private JButton ret;
//.....
private JPanel panel;
private int input; // private non-static field now
并在构造函数中设置它:
public HanoisFrames(int input) {
this.input = input;
这样每个 HanoisFrames 将有一个独特且持久的输入值
<小时/>侧面推荐:
我建议不要创建然后交换一堆 JFrame。相反，将您的代码用于创建 JPanel，然后在需要时使用 CardLayout 交换它们。
关于java - 如何在鼠标监听器中添加参数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56511445/