用java编写一个简单的程序,显示窗口,如图所示,按动按钮后,修改按钮初...

发布网友发布时间：2024-01-19 23:33

共3个回答

热心网友时间：2024-08-08 05:59

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class Button extends JPanel implements ActionListener {

    private JButton button;

    private final String ACCEPT = "接受按键";
    private final String PRESSED = "按钮已按";
    private static final String TITLE = "Button";


    public Button() {
        button = new JButton(ACCEPT);
        button.setVerticalTextPosition(AbstractButton.CENTER);
        button.setHorizontalTextPosition(AbstractButton.CENTER);
        button.setAlignmentX(Component.CENTER_ALIGNMENT);
        button.setMargin(new Insets(20, 20, 20, 20));
        button.addActionListener(this);

        setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
        add(Box.createVerticalGlue());
        add(button);
        add(Box.createVerticalGlue());
    }


    public void actionPerformed(ActionEvent e) {
        button.setText(PRESSED);
    }


    private static void createAndShowGUI() {
        JFrame frame = new JFrame(TITLE);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Button newContentPane = new Button();
        newContentPane.setOpaque(true);

        frame.setContentPane(newContentPane);
        frame.setSize(400, 250);
        frame.setVisible(true);
    }


    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                createAndShowGUI();
            }
        });
    }

}

结果：

点击前：

点击后：

热心网友时间：2024-08-08 05:57

怎么也得给个几十分吧，一都没有....

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;

public class TestFrame extends JFrame
{

int i = 0;

JButton b = null;

public TestFrame()
{
this.setBounds(100, 100, 200, 200);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setLayout(null);
b = new JButton();
b.setBounds(20, 20, 100, 30);
b.setText("按钮");
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
i++;
b.setText("已按" + i + "次");
}
});
this.add(b);
}

/**
* @param args
*/
public static void main(String[] args)
{
TestFrame f = new TestFrame();
}
}

热心网友时间：2024-08-08 06:02

祝你好运气。。。。。。。。。。。。。。。。。