JAVA学习笔记

1、java中引用类型的变量有数组arry[]、字符串String。
2、java中return用于在方法中的返回；而break、continue是用于在循环中的跳出；

1、评委打分（去掉最高分、最低分，求和算平均值）
算平均分可能是小数，所以需乘1.0转换类型

2、解密？

3、双色球中奖系统

package com.rongtong;

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

public class test2 {
    //主方法
    public static void main(String[] args) {
        int[] luckNumbers = createLuckNumber();
       // printArray(luckNumbers);

        int[] userNumbers = userInputNumber();
       // printArray(userNumbers);
        judge(luckNumbers,userNumbers);

    }
    //判断中奖情况、
    public static void judge(int[] luckNumbers,int[] userNumbers) {
        int redHitNumbers = 0;
        int blueHitNumbers = 0;
        for (int i = 0; i < userNumbers.length - 1; i++) {
            for (int j = 0; j < luckNumbers.length - 1; j++) {
                if (userNumbers[i] == luckNumbers[j]) {
                    redHitNumbers++;
                    break;
                }

            }

        }
        blueHitNumbers = luckNumbers[luckNumbers.length - 1] == userNumbers[userNumbers.length - 1] ? 1 : 0;

        if (blueHitNumbers == 1 && redHitNumbers < 3) {
            System.out.println("恭喜您，中了5元小奖！！！");

        } else if (blueHitNumbers == 1 && redHitNumbers == 3 || blueHitNumbers == 0 && redHitNumbers == 4) {
            System.out.println("恭喜您，中了10元小奖！！！");

        } else if (blueHitNumbers == 1 && redHitNumbers == 4 || blueHitNumbers == 0 && redHitNumbers == 5) {
            System.out.println("恭喜您，中了200元奖！！！");

        } else if (blueHitNumbers == 1 && redHitNumbers == 5) {
            System.out.println("恭喜您，中了3000大奖！！！");
        } else if (blueHitNumbers == 0 && redHitNumbers == 6) {
            System.out.println("恭喜您，中了500万超级大奖！！！");

        } else if (blueHitNumbers == 1 && redHitNumbers == 6) {
            System.out.println("恭喜您，中了1000万巨奖！可以享受人生，诗与远方！");
        }else {
            System.out.println("感谢您对福利事业的贡献！");
        }
        System.out.println("中奖号码是：");
        printArray(luckNumbers);
        System.out.println("您投注号码是：");
        printArray(userNumbers);
        System.out.println("您中了" + redHitNumbers +"个红球");
        System.out.println("您是否命中蓝球:" +( blueHitNumbers == 1 ? "是" : "否"));
    }
    //输出数组方法
    public static void printArray(int[] arr){

        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }
        System.out.println();
    }

    //creatLuckNumber方法开始
    public static int[] createLuckNumber(){
        int[] number = new int[7];
        Random r = new Random();
        for (int i = 0; i < number.length - 1; i++) {
            while (true) {
                boolean flage = true;
                int data = r.nextInt(33) + 1;
                for (int j = 0; j < i; j++) {
                    if (number[j] == data) {
                        flage = false;
                        break;
                    }
                }
                if (flage){
                    number[i] = data;
                    break;
                }

            }
        }
        number[number.length - 1] = r.nextInt(16) + 1;
        return number;
    }//creatLuckNumber方法结束

//createUserNumber方法开始
    public static int[] userInputNumber(){
        int[] numbers = new int[7];
        Scanner sc = new Scanner(System.in);
        for (int i = 0; i < numbers.length - 1; i++) {
            System.out.println("接下来请输入"+(i+1)+"个红色球号码（要求不要重复,且在1 - 33内）");
            while(true){
                boolean flage = true;
                int data = sc.nextInt();
                for (int j = 0; j < i; j++){
                    if ((data == numbers[j]) || (data<1 || data > 33)){
                        System.out.println("数据有误，请您重新输入：");
                        flage = false ;
                        break;
                    }
                }
                if (data<1 || data > 33){
                    System.out.println("数据有误，请您重新输入：");
                    flage = false ;

                }
                if (flage){
                    numbers[i] = data;
                    break;
                }
            }
        }
        System.out.println("请输入蓝色球号码：");
        while(true) {
            boolean flage = true;
            int data = sc.nextInt();
            if (data > 16 || data < 1) {
                System.out.println("数据有误，请重新输入：");
                flage = false;
            }
            if (flage){
                numbers[6] = data;
                break;
            }
        }
      return numbers;
    }//createUserNumber方法结束
}

4、定义类总结