不成熟的印章

import java.awt.*;
import javax.swing.*;
public class Test  {
    String[] str={"1","2","3","4","5","6","7","8","0"};
    int i=0;
    JLabel[]Jl=new JLabel[9];
    JPanel jp;
    JLabel[]J2=new JLabel[2];
    JLabel[]J3=new JLabel[2];
    Test(){
        int i;
        JFrame f=new JFrame("0-9");
        f.setDefaultCloseOperation(3);
        f.setSize(100,100);
       
        f.setVisible(true);
        Container cc=f.getContentPane();
        aa();
        cc.setLayout(new BorderLayout());
        for(i=0;i<2;i++){
            J2[i]=new JLabel("--------------------------");
            J3[i]=new JLabel("|");
           
        }
        cc.add(J2[0],"North");
        cc.add(J2[1],"South");
        cc.add(J3[0],"West");
        cc.add(J3[1],"East");
       
       
        cc.add(jp);
    }
   
   
        void aa(){
           
            int i=0;
            jp=new JPanel(new GridLayout(3,3,3,3));
           
            for(i=0;i<str.length;i++)
            {
                Jl[i]=new JLabel(str[i]);
                jp.add(Jl[i]);
               
            }
        }
       
       
   

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        new Test();
       
        }

    }