LoopExample改进版

经过一番查书与改进，终于把这个程序改了出来了

 import javax.swing.*;public class aa {public static void main(String[] args){int n,j,k,space;String result=(String)JOptionPane.showInputDialog(null,"请输入一个数","输入对话框",JOptionPane.PLAIN_MESSAGE,null,null,null);n=Integer.parseInt(result);space=40;for(j=0;j<=n;j++,space-=1){for(int i=0;i<space;i++)System.out.print(" ");for(k=1;k<=2*j+1;k++)System.out.print("*");System.out.print("\n");}}}