java基础练习22-1-16

swich年龄 九九乘法表 空心菱形

import java.util.Scanner;

public class Demo1 {
    public static void main(String[] args) {
        d3();
    }

    /**
     * swich年龄
     */
    public static void d1() {
        Scanner scanner = new Scanner(System.in);
        int yue = scanner.nextInt();
        if (yue >= 4 && yue <= 10) {
            int nianling = scanner.nextInt();
            if (nianling >= 60) {
                System.out.println(20);
            } else if (nianling >= 18) {
                System.out.println(60);
            } else {
                System.out.println(30);
            }
        } else {
            int nianling = scanner.nextInt();
            if (nianling >= 18 && nianling <= 60) {
                System.out.println(40);
            } else {
                System.out.println(20);
            }
        }
    }

    /**
     * 九九乘法表
     */
    public static void d2() {
        for (int i = 1; i <= 9; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print(j + "+" + i + "=" + j * i + "\t");
            }
            System.out.println();
        }
    }

    /**
     * 空心菱形
     */
    public static void d3() {
        int tol = 14;
        for (int i = 0; i < tol * 2 - 1; i++) {
            if (i < tol) {
                for (int k = 0; k < tol - i - 1; k++) {
                    System.out.print(" ");
                }
                for (int j = 0; j < (i + 1) * 2 - 1; j++) {
                    if (j == 0 || j == (i + 1) * 2 - 1 - 1) {
                        System.out.print("*");
                    } else {
                        System.out.print(" ");
                    }
                }
            } else {
                for (int k = 0; k < i - tol + 1; k++) {
                    System.out.print(" ");
                }
                for (int j = (tol * 2 - 1 - i) * 2 - 1; j > 0; j--) {
                    if (j == (tol * 2 - 1 - i) * 2 - 1 || j == 1) {
                        System.out.print("*");
                    } else {
                        System.out.print(" ");
                    }
                }
            }

            System.out.println();
        }
    }
}