11.7 使用调试器

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import javax.swing.*;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener; public class BuggyButtonTest {    public static void main(String[] args) { EventQueue.invokeLater(new Runnable() {     @Override     public void run() {  BuggyButtonFrame frame = new BuggyButtonFrame();  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  frame.setVisible(true);     } });    }} class BuggyButtonFrame extends JFrame {    private static final int W = 300;    private static final int H = 200;    public BuggyButtonFrame(){ setTitle("BuggyButtonTest"); setSize(W,H);  BuggyButtonPanel panel = new BuggyButtonPanel(); add(panel);    }} class BuggyButtonPanel extends JPanel{    public BuggyButtonPanel(){ ActionListener listener = new ButtonListener();  String [] colors = new String[]{"Yellow","Blue","Red"}; for(int i = 0; i < colors.length; i++){     JButton b = new JButton(colors[i]);     add(b);     b.addActionListener(listener); }    }     private class ButtonListener implements ActionListener{ @Override public void actionPerformed(ActionEvent e) {     String arg = e.getActionCommand();      String [] colors = new String[]{"yellow","blue","red"};     Color[] colorObjs = new Color[]{Color.YELLOW,Color.BLUE,Color.RED};      for(int i = 0;i < colors.length; i++){  if(arg.equals(colors[i])){      setBackground(colorObjs[i]);  }     } }    }}

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🍓 断点：希望在某一句执行前查看的位置，点击行号左侧，出现红色小圆圈即可（需要在执行前或执行到这一句前加断点）

🍓 IDEA 调试方式1：右键+DEBUG 按钮

🍓 IDEA 调试方式2：点击 main 左侧小图标 + DEBUG 按钮

比如点击这个位置

🍓 查看参数方式 1：下方控制台 Debug->Debugger->右下角查看

🍓 查看参数方式 2：鼠标光标移动到变量上查看

此处发现起的名称不同，把公共名称改为在外侧定义数组，防止重复书写字符串出错

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import javax.swing.*;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener; public class BuggyButtonTest {    public static void main(String[] args) { EventQueue.invokeLater(new Runnable() {     @Override     public void run() {  BuggyButtonFrame frame = new BuggyButtonFrame();  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  frame.setVisible(true);     } });    }} class BuggyButtonFrame extends JFrame {    private static final int W = 300;    private static final int H = 200;    public BuggyButtonFrame(){ setTitle("BuggyButtonTest"); setSize(W,H);  BuggyButtonPanel panel = new BuggyButtonPanel(); add(panel);    }} class BuggyButtonPanel extends JPanel{    public BuggyButtonPanel(){ ActionListener listener = new ButtonListener();  for(int i = 0; i < colors.length; i++){     JButton b = new JButton(colors[i]);     add(b);     b.addActionListener(listener); }    }     final String [] colors = new String[]{"Yellow","Blue","Red"};    private class ButtonListener implements ActionListener{ @Override public void actionPerformed(ActionEvent e) {     String arg = e.getActionCommand();      final Color[] colorObjs = new Color[]{Color.YELLOW,Color.BLUE,Color.RED};      for(int i = 0;i < colors.length; i++){  if(arg.equals(colors[i])){      setBackground(colorObjs[i]);  }     } }    }}

❤🧡💛💚💙💜🤎🖤❤🧡💛💚💙💜🤎🖤❤🧡💛💚💙💜🤎🖤

🍉 小贴士：相似的代码尽量用循环处理，公共的变量使用全局变量（成员变量）定义

相关内容：选择 《Java核心技术 卷1》查找相关笔记

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