java编程 在Applet启动后，在窗体中显示一个9*9乘法表

import javax.swing.*;
public class Exercise{
public static void main(String []args){
String outString=" Multiplication table\n";
outString+="---------------------------------------------------\n";
outString+=" |";
for(int j=1;j<10;j++){
outString+=" "+j;
}
outString+="\n";
for(int j=1;j<10;j++){
outString+=j+" |";
for(int i=1;i<10;i++){
if(i*j<10)
outString+=" "+j*i;
else
outString+=" "+j*i;
}outString+="\n";
}

JOptionPane.showMessageDialog(null,outString,"",JOptionPane.INFORMATION_MESSAGE);
System.exit(0);
}
}

你下错一个软件！