java - Java中的按钮

Question

这是我的代码的一部分，没有实际的主类，因为它工作正常。我正在尝试编写一个程序，如果您按是（item3），它会说“您知道书名吗？”，但如果您按否（item4），它会询问“您想还书吗”。到目前为止，无论我按下哪个按钮，它都会返回“你知道书名吗？”。我知道这是因为我在这里将 isClicked 更改为 true：'private boolean isClicked = true;' 但我不知道如何改变它，让它做我想要的。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Welcome extends JFrame {
    private JLabel title1, title2; 
    private JButton item3, item4;

    public Welcome(){
        super("Welcome to Andrew's Library");
        setLayout(new FlowLayout());
        setBackground(Color.RED);   

        boolean isClicked = false;
        title1 = new JLabel("Welcome to Andrew's Library!!!");
        title2 = new JLabel("Would you like to check out a book?");
        item3 = new JButton("YES");
        item4 = new JButton("NO");

        add(title1);
        add(title2);
        add(item3);
        add(item4);

        HandlerClass handler = new HandlerClass();

        item3.addActionListener(handler);
        item4.addActionListener(handler);
    }

    private class HandlerClass implements ActionListener{
        private boolean isClicked = true;

        public void actionPerformed(ActionEvent event){

            if(isClicked){
                title1.setText("Do you know the title of the book?");
                title2.setText(null);       
            } else {
                title1.setText(null);
                title2.setText(null);   
                item3.setVisible(false);
                item4.setText("Do you want to return a book?");
            }
        }
    }           
}

Answer 1

也许试试这个？取ActionEvent 参数，看看source 是否等于JButton。

private class HandlerClass implements ActionListener{
  private boolean isClicked = true;
  public void actionPerformed(ActionEvent event){
    if(isClicked){
        title1.setText("Do you know the title of the book?");
        /** TODO uncomment here
        if(item3.equals(event.getSource())
          System.out.println("item3 pressed");
        else
          System.out.println("item4 pressed");
        //*/
    } else {...