Question

I am trying to add some buttons but it only shows button3 , I don't know why I didn't found any duplicate with other question

How I can make each one of these buttons to show(when someone clicked them) on a label the value of a variable? Please if anyone can help

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是想看到所有按钮，您可以尝试这样做：

删除您的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);
}

我强烈建议您先阅读有关swing布局的文档： A Visual Guide to Layout Managers

swing java multiple buttons gui

1 个答案: