topleveldemo.java

来自「java是一种面向对象程序的语言,我这里介绍了有关java课件的许多事例,它能帮」· Java 代码 · 共 34 行

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

public class TopLevelDemo {
    public static void main(String s[]) {
        JFrame frame = new JFrame("TopLevelDemo");

        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        JLabel yellowLabel = new JLabel("I'am JLabel");
        //将JLabel设为不透明，以便修改JLabel的背景色
        //yellowLabel.setOpaque(true);
        yellowLabel.setBackground(Color.yellow);
        yellowLabel.setPreferredSize(new Dimension(200, 180));

        JMenuBar cyanMenuBar = new JMenuBar();
        cyanMenuBar.setOpaque(true);
        cyanMenuBar.setBackground(Color.cyan);
        cyanMenuBar.setPreferredSize(new Dimension(200, 20));

        frame.setJMenuBar(cyanMenuBar);
        frame.getContentPane().add(yellowLabel, BorderLayout.CENTER);

        frame.pack();
        frame.setVisible(true);
    }
}