java第十周作业

编写一个方法，实现冒泡排序（由小到大），并调用该方法
package Lianxi;
import java.util.Arrays;

public class test{

    public static void main(String[] args) {
        int[] array = {2, 6, 7, 9, 8, 5};
        
        bubble(array);
    }

    private static void bubble(int[] array) {
        for (int i = 0; i < array.length - 1; i++) {
            for (int j = 0; j < array.length - 1 - i; j++) {
                if (array[j] > array[j + 1]) {
                    int temp = array[j];
                    array[j] = array[j + 1];
                    array[j + 1] = temp;
                }
            }
        }
        System.out.println(Arrays.toString(array));
        for (int i = 0; i < array.length; i++) {
            System.out.println(array[i]);
        }

    }
}

 

 

package Lianxi;


public class test2  {

    public static void main(String[] args) {
        System.out.println("请输入数字");
        int b=5;
        jiecheng(b);
    }

    public static void jiecheng(int a) {
        int b;
        int c=1;
        c=a;
        for(b=1;b<a;b++) {
            c *= b;
        }
            System.out.println(c);

    }
}

 

 

package Lianxi;

import java.util.Scanner;

public class test3 {
    public static void pd(int year) {
        if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
            System.out.println(year + "是闰年");
        }
        else {
            System.out.println(year + "是平年");
        }
    }


    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("输入年份");
        pd(input.nextInt());
    }

}

 

package Lianxi;

import java.util.Random;
import java.util.Scanner;



public class test4{

    public static void SY() {
        Scanner input = new Scanner(System.in);
        System.out.println("<<<<<<<<<<欢迎使用会员抽奖系统>>>>>>>>>>");
        System.out.println("    1.登录");
        System.out.println("    2.注册");
        System.out.println("    3.幸运抽奖");
        System.out.println("    4.退出");
        System.out.println("    请输入数字编号进行操作");
        int i = input.nextInt();
        switch (i) {
            case 1:
                login();
                break;
            case 2:
                reg();
                break;
            case 3:
                lucky();
            default:
                System.out.println("输入错误，请重新输入！");
                SY();

        }

    }

    private static void lucky() {
        // 输入四位会员卡号，如果百位数等于随机数，幸运会员。否则不是。同时也要询问是否返回主菜单
        Scanner input = new Scanner(System.in);
        Random r = new Random();
        int luck = r.nextInt(10);
        System.out.println("请输入四位会员卡号");
        int id = input.nextInt();
        if (luck == id) {
            System.out.println("恭喜您是幸运会员");
        } else {
            System.out.println("对不起您不是幸运会员");
        }
        returnMain();
    }

    public static void returnMain() {
        Scanner input = new Scanner(System.in);
        System.out.println("是否返回主菜单？（Y/S）");
        if (input.next().equalsIgnoreCase("Y"))
            SY();
        else
            System.out.println("谢谢使用");
    }

    public static void reg() {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("输入要注册的用户名");
        String uname = input.next();
        System.out.println("输入注册密码");
        String upwd = input.next();
        System.out.println("注册成功");
        returnMain();

    }

    public static void login() {
        Scanner input = new Scanner(System.in);
        System.out.println("输入用户名");
        String uname = input.next();
        System.out.println("输入密码");
        String upwd = input.next();
        if (uname.equals("123") && upwd.equals("123")) {
            System.out.println("输入正确");
        } else {
            System.out.println("输入错误");
        }
        returnMain();
    }

    public static void main(String[] args) {
        SY();

    }

}