import java.awt.*;
import javax.swing.*;
public class java0 extends JFrame{
JButton [] an={null,null,null,null,null};
public static void main(String[] args)
{java0 a=new java0();
java0 b=new java0();}
publicjava0(){
an[0]=new JButton("上");
an[1]=new JButton("下");
an[3]=new JButton("左");
an[4]=new JButton("右");
an[5]=new JButton("中");
this.setLayout(new FlowLayout());
this.add(an[0]);
this.add(an[1]);
this.add(an[2]);
this.add(an[3]);
this.add(an[4]);
System.out.print("aaa");
this.setVisible(true);
this.setSize(320,240);
this.setTitle("用户界面");
this.setLocation(100,260);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton b=new JButton("button");
}}