J003_打印图形

题目描述

用“*”打印图形

1、打印正方形（四行四列的*）

public static void square(int n){
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= n;j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }

2、打印长方形

public static void lon(int a,int b){
        for (int i = 1; i <= a; i++) {
            for (int j = 1; j <= b; j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }

3、打印三角形

public static void three(int n){
        for (int i = 1; i <= n; i++) {
            for (int j = 1;j <= n - i;j++){
                System.out.print(" ");
            }
            for (int k = 1; k <= 2 * i -1;k++){
                System.out.print("*");
            }
            System.out.println();
        }
    }

测试程序

public static void main(String[] args) {
        //图形打印
        //test
        square(4);
        System.out.println("----------");
        lon(3,4);
        System.out.println("----------");
        three(4);
    }