import java.awt.*;import javax.swing.*; public class JFrameDemo extends Frame{ public static void main(String[] args) {  JFrameDemo frame = new JFrameDemo ("My Frame");  frame.setSize(200,200);  frame.setBackground(Color.red);  frame.setLayout(null);  frame.setVisible(true);  Panel panel = new Panel();  panel.setSize(100, 100);  panel.setBackground(Color.yellow);  frame.add(panel);  //frame.show(); }  public JFrameDemo (String str) {  super(str); }}   谁都会写但这可以说是最最原始的......GUI的HelloWorld吧!

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