import javax.swing.*;
public class MyFrame extends JFrame{
piublic MyFrame(){
this.setTitle("这是我第一个窗口");
this.setSize(300,300);
this.setResizable(false);
this.setVisible(true);
}
public static void main(String args[]){
MyFrame frame1=new MyFrame();
}
}
import java.awt.*;
public class ContenPaneDemo extends JFrame{
public ContentPaneDemo(){
super("我喜欢的第一个明星张国荣");
Container contentPane=this.getContentPane();//这代码有什么作用
contentPane.setBackground(Color.cyan);
this.setSize(300,300);
this.setResizable(false);
this.setVisible(true);
public static void main(String args[]){
ContentPaneDemo lesile=new ContentPaneDemo();
}
}