10.打印三角形

package com.duan.struct;

public class TestDemo {
     public static void main(String[] args) {
        //打印三角形 5行

        for (int i = 1; i <= 5; i++) {
            for (int j = 5; j >= i; j--) {
                System.out.print(" ");
            }
            for (int j = 1; j <= i; j++) {
                System.out.print("*");
            }
            for (int j = 1; j < i; j++) {
                System.out.print("*");
            }
            
            System.out.println();
        }
    }
}

结果：
     *
    ***
   *****
  *******
 *********