java控制台打印心型 java代码打印

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恋上一只猪 2023-05-23 14:37:34

1.打印等腰三角形

import java.util.Scanner;//引入Scanner包，用于输入值
public class HomeWork01 {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入打印的等腰三角形的行数:");
        int line=sc.nextInt();
        for (int i = 0; i < line; i++) {//控制打印的行数
            for (int j = 1; j <line-i; j++) {
                System.out.print(" ");//打印空格
            }
            for (int k= 0; k<=i ; k++) {
                System.out.print("* ");//打印*加空格
            }
            System.out.println();//换行
        }
    }
}

输入需要打印的行数n，即可打印出n行的等腰三角形

2. 打印菱形

import java.util.Scanner;
public class HomeWork02 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输出打印菱形的边长：");
        int bian = sc.nextInt();
        for (int i = 0; i < bian; i++) {
            for (int j = 1; j < bian - i; j++) {
                System.out.print(" ");
            }
            for (int k = 0; k <= i; k++) {
                System.out.print("* ");
            }
            System.out.println();
        }
        for (int i = 0; i < bian; i++) {
            for (int j = 0; j <= i; j++) {
                System.out.print(" ");
            }
            for (int k = 1; k < bian - i; k++) {
                System.out.print("* ");
            }
            System.out.println();
        }
    }
}

//打印菱形的方法和打印等腰三角形的方法如出一辙，只不过是到了n行的时候继续打印n+1行，然后打印*的个数减一。
输入要打印菱形的边数n，这里演示n=10；运行结果如下：

3.打印平行四边形

import java.util.Scanner;

public class HomeWork03 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输出打印平行四边形的边长：");
        int line = sc.nextInt();
        for (int i = 0; i < line; i++) {
            for (int j = 0; j <line-i ; j++) {
                System.out.print(" ");
            }
            for (int k = 0; k < line; k++) {
                System.out.print("* ");
            }
            System.out.println();
        }
    }
}