练习

package com.tang.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();
        }
    }
}