Java的SwingGUI入门程序

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

public class SwingDemoMain {
    private static void createGUI(){

        //JFrame指一个窗口，构造方法的参数为窗口标题
        JFrame frame=new JFrame("swing demo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //内容面板(ContentPane)
        Container contentPane=frame.getContentPane();
        contentPane.setLayout(new FlowLayout());

        //向内容面板里添加控件，如JLabel、JButton
        contentPane.add(new JLabel("Hello world"));
        contentPane.add(new JButton("测试"));

        //设置窗口的其它参数，如窗口大小
        frame.setSize(400,300);

        //显示窗口
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                createGUI();
            }
        });
    }
}