swing java多按钮gui

Question

我正在尝试添加一些按钮，但它只显示 button3 ，我不知道为什么 我没有发现任何与其他问题重复的问题

如何使这些按钮中的每一个在标签上显示（当有人单击它们时）变量的值？ 如果有人可以帮忙，请帮忙

import java.awt.Container;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.GroupLayout;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;

public class gui extends JFrame {

    public gui() {

        initUI();
    }

    private void initUI() {

        JButton quitButton = new JButton("Quit");
        JButton button1 = new JButton("button1");
        JButton button2 = new JButton("button2");
        JButton button3 = new JButton("button3");

        quitButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent event) {
                System.exit(0);
            }
        });

        button1.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent event) {
                System.exit(0);
            }
        });

        createLayout(quitButton);
        createLayout(button1);
        createLayout(button2);
        createLayout(button3);

        setTitle("example");
        setSize(500, 300);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    private void createLayout(JComponent... arg) {

        Container pane = getContentPane();
        GroupLayout gl = new GroupLayout(pane);
        pane.setLayout(gl);

        gl.setAutoCreateContainerGaps(true);

        gl.setHorizontalGroup(gl.createSequentialGroup()
                .addComponent(arg[0])
        );

        gl.setVerticalGroup(gl.createSequentialGroup()
                .addComponent(arg[0])
        );
    }

    public static void main(String[] args) {

        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                gui ex = new gui();
                ex.setVisible(true);
            }
        });
    }

Answer 1

如果您不知道并且只想查看所有按钮，您可以这样尝试：

• 删除你的 createLayout()

• 将您的 initUI() 方法替换为：

  private void initUI() {
  
      JButton quitButton = new JButton("Quit");
      JButton button1 = new JButton("button1");
      JButton button2 = new JButton("button2");
      JButton button3 = new JButton("button3");
      JPanel panel = new JPanel();
  
      quitButton.addActionListener(new ActionListener() {
  
          @Override
          public void actionPerformed(ActionEvent event) {
              System.exit(0);
          }
      });
  
      button1.addActionListener(new ActionListener() {
  
          @Override
          public void actionPerformed(ActionEvent event) {
              System.exit(0);
          }
      });
  
      getContentPane().add(panel);
  
      panel.add(quitButton);
      panel.add(button1);
      panel.add(button2);
      panel.add(button3);
  
      setTitle("example");
      setSize(500, 300);
      setLocationRelativeTo(null);
      setDefaultCloseOperation(EXIT_ON_CLOSE);
  }
  

我强烈建议您首先阅读有关摇摆布局的文档： A Visual Guide to Layout Managers