Java实现的猜数字游戏示例

package com.example.test;
import java.util.Random;
import java.util.Scanner;
public class NumberCode {
  int[] Nums = new int[4];
  int[] inputNumsArray = new int[4];
  int difficultyLevel;
  int difficulty;
  int aA = 0;
  int bB = 0;
  String numberStr = "";
  String str = "";
  /**
   * 生成随机数
   */
  public int[] randNums(int n) {
    for (int i = 0; i < Nums.length; i++) {
      Random ran = new Random();
      int a = ran.nextInt(10);
      if (i - 1 != -1) {
        for (int j = 0; j < i; j++) {
          if (a == Nums[j]) {
            i--;
            break;
          } else {
            Nums[i] = a;
          }
        }
      } else {
        Nums[i] = a;
      }
    }
    return Nums;
  }
  /**
   * 选择游戏难度 
   */
  public int selectLevel() {
    // 接受一个数字
    // 1：Easy 可以猜12次
    // 2：Common 可以猜9次
    // 3：Hard 可以猜7次
    @SuppressWarnings("resource")
    Scanner scan = new Scanner(System.in);
    System.out
        .println("请选择难度系数(输入数字)，1：Easy 可以猜12次;2：Common 可以猜9次;3：Hard 可以猜7次");
    difficulty = scan.nextInt();
    switch (difficulty) {
    case 1:
      difficultyLevel = 12;
      break;
    case 2:
      difficultyLevel = 9;
      break;
    case 3:
      difficultyLevel = 7;
      break;
    default:
      break;
    }
    return difficultyLevel;
  }
  /**
   * 接受用户输入的数字
   */
  public int[] inputNums(int n) {
    @SuppressWarnings("resource")
    Scanner scan = new Scanner(System.in);
    int b = scan.nextInt();
    for (int i = 0; i < inputNumsArray.length; i++) {
      int c = (int) ((int) b / Math.pow(10, 3 - i));
      inputNumsArray[i] = c;
      b = (int) (b - c * Math.pow(10, (3 - i)));
    }
    return inputNumsArray;
  }
  /**
   * 数字比对的方法
   */
  public String compare(int[] answer, int[] inputs) {
    for (int i = 0; i < answer.length; i++) {
      if (inputs[i] == answer[i]) {
        aA += 1;
        continue;
      } else {
        for (int j = 0; j < answer.length; j++) {
          if (inputs[i] == answer[j]) {
            bB += 1;
          }
        }
      }
    }
    str = "" + aA + "A " + bB + "B ";
    return str;
  }
  /**
   * 整个游戏过程代码 
   */
  public void play() {
    randNums(4);
    for (int i = 0; i < Nums.length; i++) {
      numberStr = numberStr + Nums[i];
    }
    selectLevel();
    System.out.println("你选择了难度系数:" + difficulty + " 共有:" + difficultyLevel
        + "次机会。");
    for (int i = 0; i < difficultyLevel; i++) {
      inputNums(4);
      int chanceNums = difficultyLevel - i - 1;
      compare(Nums, inputNumsArray);
      if (aA != 4) {
        if (chanceNums == 0) {
          System.out.println("机会用完了,答案是:" + numberStr);
          break;
        } else {
          System.out.println(str + " 你还有" + chanceNums + "次机会");
        }
        aA = 0;
        bB = 0;
      } else if (aA == 4) {
        System.out.println("恭喜你，答对了");
        break;
      }
    }
  }
  public static void main(String[] args) {
    NumberCode a = new NumberCode();
    a.play();
  }
}