如何生成一个随机数后，用户猜测正确的数字？

Question

我已经编写了下面的代码。我已经运行了这个程序，它允许用户猜测正确的数字并成功返回消息。然而，我不能让它重新生成一个新的随机数？我也不能包括一个选项来询问用户是否想退出。请帮忙。谢谢你。

import java.util.*;

class CompterAge {
  public static void main (String[] args) {
    Scanner sc = new Scanner(System.in);

    boolean correctGuess = false;
    
    Random r = new Random();
    int randNum = r.nextInt(100-1+1) + 1;
      
      while (!correctGuess) {
        System.out.println("Guess the computer's age: ");
        int guess = sc.nextInt();
        
        if ((guess > 0) && (guess <= 100)) {
              if (guess > randNum) {
                System.out.println("Your guess is bigger than the number. You should go lower.");
                correctGuess = false;
              } else if (guess < randNum) {
                System.out.println("Your guess is smaller than the number. You should go higher.");
                correctGuess = false;
              } else {
                System.out.println("Congratulations. You got the number! The number is " + randNum);
                System.out.println("Do you wish to continue the game? Yes/No");
                String input = sc.next();
                if (input == "Yes") {
                  correctGuess = false;
                } else {
                  break;
                }
              }
        } else {
        System.out.println("Please enter a number between 1 to 100.");
        correctGuess = false;
        }
      } 
      
}
}

Answer 1

这段代码工作，我已经添加了另一个标志变量，并纠正了一些逻辑错误。见评论。

boolean correctGuess = false;
boolean endGame = false;

Random r = new Random();

while (!endGame){  
    int randNum = r.nextInt(101); //Why did you have (100-1+1) + 1 ?? Simple (101) was enough
    correctGuess = false;
    while (!correctGuess) {
        System.out.println("Guess the computer's age: ");
        int guess = sc.nextInt();
        
        if ((guess > 0) && (guess <= 100)) {
            if (guess > randNum) {
                System.out.println("Your guess is bigger than the number. You should go lower.");
                correctGuess = false;
            } else if (guess < randNum) {
                System.out.println("Your guess is smaller than the number. You should go higher.");
                correctGuess = false;
            } else {
                correctGuess = true; //Will exit the Inner Loop
                System.out.println("Congratulations. You got the number! The number is " + randNum);
                System.out.println("Do you wish to continue the game? Yes/No");
                String input = sc.next().toLowerCase();
                if (input.equals("yes")) { //You can not use == for String Comparisons
                endGame = false;
                } else {
                endGame = true;
                }
            }
        } else {
        System.out.println("Please enter a number between 1 to 100.");
        correctGuess = false;
        }
    } 
}