在drJava

Question

我对编程很新，并且遇到了我想出的程序问题。这是一个猜谜游戏，用户必须猜测生成的随机数，你有6次机会。不幸的是，我不太明白这个程序有什么问题。每当我尝试输入＆＃34;是＆＃34;启动程序，没有任何反应。下面列出的是代码，请让我知道我做错了什么。

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

public class Project4{
  public static void main(String[] args){
    Scanner input = new Scanner(System.in);
    System.out.println("Would you like to play a game? (Yes or No)");
    String a1 = input.next().toLowerCase();
    while(a1.equals("Yes")){
               Random secretnum = new Random();
      int num;
      for(int counter=0; counter<2; counter++){
        num = 1+secretnum.nextInt(99);  
      System.out.println("You have 6 chances to guess the secret number");
        System.out.println("Player : guess a number between 1 and 100");
        int num1 = input.nextInt();
        while(num1 != num){
          for(int i = 6; i < 0; i--){
            if(num1 < num){
              System.out.println("Sorry," + num1 + "is too low");
              System.out.println("You have" + i + "strikes left");
            }else{
              if(num1 > num){
                System.out.println("Sorry," + num1 + "is too high");
                System.out.println("You have" + i + "strikes left");
              }
            }
            if(num1 == num){
            System.out.println("Correct! The secret number was" + secretnum);
          }
        }
        if(num1 < 0 || num1 > 100){
          for(int i = 6; i < 0; i--){
          System.out.println("You were supposed to enter a number between 1 and 100");
          System.out.println("You have" + i + "strikes left");

          }
        }
      }
    }
    if(a1.equals("No"));
    System.out.println("Goodbye");
  }
   input.close();
}
}

Answer 1

你的问题在这里：

String a1 = input.next().toLowerCase();
while(a1.equals("Yes")){

第一行将任何输入转换为小写，并将该操作的结果存储到 a1 。

第二行检查 a1 是否等于＆＃34;是＆＃34;。提示：小写字符串几乎不能等于＆＃34; Y es＆＃34;＆＃34;。这是预先降低输入量的重点！

这里真正的答案是：当你不熟悉这些电话的作用时，请研究他们的javadoc！