程序代码：

import javax.swing.JOptionPane;

public class Nine
{ 
    static String str="";
    public static void draw(int i,int j)
    {
        if(j<=i)
        {
            str+=i+"*"+j+"="+(i*j);
            str+=i*j>9?" ":"   ";
            draw(i,j+1);  
        } 
    }
    public static void draw(int n)          
    {                                            
        if(n>0)                                 
        {                                      
            draw(n-1);                       
            draw(n,1);                           
            str+="\n";                         
        }                                      
    }                                          
    public Nine()
    {
        draw(9);
        JOptionPane.showMessageDialog(null, "打印结果:\n"+str,"九九乘法表",JOptionPane.INFORMATION_MESSAGE);
        str="";
    }
    public static void main(String[] args)
    { 
        new Nine(); 
    }    
}