测试 菱形的打印 键盘的格式化输出

测试一，键盘的格式化输出

import java.util.Scanner;

public class test01 {
	public static void main(String[] args) {
		Scanner ipt = new Scanner(System.in);
		System.out.println("请输入姓名，年龄，地点：");
		String name = ipt.next();
		int age = ipt.nextInt();
		String place = ipt.next();
		System.out.println("我叫"+name+"我"+age+"岁了我家在"+place);
	}
}

运行效果：

测试二，菱形的打印

import java.util.Scanner;

public class test02 {
	public static void main(String[] args) {
		Scanner ipt = new Scanner(System.in);
		System.out.println("请输入打印的行数：");
		int rows = ipt.nextInt();
		boolean bool = false;
		if (rows%2==0) {
			rows = rows;
			bool = false;
		}else {
			rows = rows+1;
			bool = true;
		}
		
		int index = 0;
		for (int i = 1; i <= rows/2; i++) {
			for (int m = 0; m < rows/2-i; m++) {
				System.out.print(" ");
			}
			for (int n = 1; n <= 2*i-1; n++) {
				System.out.print("*");
				index = n+1;
			}
			System.out.println();
		}
		
		int residue = rows-rows/2;
		if (bool) {
			--residue;
			for (int i = residue,m = 0; i > 0; i--,m++) {
				for (int j = 0; j <= m; j++) {
					System.out.print(" ");
				}
				for (int j = 1; j <= i*2-1; j++) {
					System.out.print("*");
				}
				System.out.println();
			}
		}else {
			for (int i = residue,m = 0; i > 0; i--,m++) {
				for (int j = 0; j < m; j++) {
					System.out.print(" ");
				}
				for (int j = 1; j <= i*2-1; j++) {
					System.out.print("*");
				}
				System.out.println();
			}
		}
		
	}
}

运行效果: