java MasterMindResource泄漏？

Question

我的代码运行良好，但在我使用扫描仪的每一行中，它都会警告我存在“资源泄漏；'userGuess'从未关闭过”我不明白这意味着什么，可能需要一些帮助来解决它。此外，如果我的代码中还有其他值得修复的地方，我可以使用帮助。请注意，我对Java编程的知识有限。我也无法让我的TryCounter++工作

package masterMind2_1;

import java.util.Scanner;

public class MasterMind2_1 {

    public static void main(String[] args) {
            System.out.println("This is MasterMind, a logic game");
            System.out.println("To win you must guess correctly where each number is(The Numbers Range from 1-4)");
            System.out.println("You will be told if you get one correct");
            System.out.println("You will only get 10 tries, then you lose");
            System.out.println("Lets begin");



            //Declare Array
            int [] answerArray;

            answerArray= new int [4];
            //Initialize Array
            //Change these value to change the answers needed to win
            answerArray[0]=2;
            answerArray[1]=3;
            answerArray[2]=2;
            answerArray[3]=2;
//          //Create Board
//          System.out.println("-- -- -- --");



            boolean guessedAll = false;
             int guessedCount=0;
             int tryCounter=0;
             while(tryCounter<9 || !guessedAll){
                 System.out.println("What is the first Number?");
            Scanner userGuess = new Scanner(System.in);
            int num = userGuess.nextInt();
            if (num==answerArray[0]) {
                guessedCount++;
            }
            System.out.println("What is the Second Number?");
            Scanner userGuess1 = new Scanner(System.in);
            int num1 = userGuess1.nextInt();
            if (num1==answerArray[1]) {
                guessedCount++;
            }           
            System.out.println("What is the Third Number?");
            Scanner userGuess2 = new Scanner(System.in);
            int num2 = userGuess2.nextInt();
            if (num2==answerArray[2]) {
                guessedCount++;
            } 
            System.out.println("What is the Fourth Number?");
            Scanner userGuess3 = new Scanner(System.in);
            int num3 = userGuess3.nextInt();
            if (num3==answerArray[3]) {
                guessedCount++;
            } 
            System.out.println("Your guess was "+ num+"  "+num1+"  "+num2+"  "+num3);
            if (num==answerArray[0]) {
                System.out.println("First number was correct");
            } else {
                System.out.println("First number was incorrect");
            }
            if (num1==answerArray[1]) {
                System.out.println("Second number was correct");
            } else {
                System.out.println("Second number was incorrect");
            }
            if (num2==answerArray[2]) {
                System.out.println("Third number was correct");
            } else {
                System.out.println("Third number was incorrect");
            }
            if (num3==answerArray[3]) {
                System.out.println("Fourth number was correct");
            } else {
                System.out.println("Fourth number was incorrect");
            }
            if (guessedCount==4) {
                System.out.println("YAY you won!!");
                guessedAll=true;
                tryCounter=10;
            } else {
                System.out.println("Try again, except this time don't fail!");
                guessedAll=false;
                tryCounter++;
                guessedCount=0;
            }

            }//What if I collected all of the values first 
        }    //then told them if they were right or Wrong?
             //Black and White Pegs?
             //Fix TryCounter...Why isn't it working
    }

谢谢你的帮助

Answer 1

错误消息告诉您，您从未在扫描仪对象上调用^{}方法。更糟糕的问题是，当您只需要一个扫描仪时，就创建了多个扫描仪

至于tryCounter不起作用

while(tryCounter<9 || !guessedAll)

如果条件的任何一部分为真，这将继续循环。我的猜测是!guessedAll在9次猜测之后评估为真，所以循环继续运行。您需要将||更改为&&以使其在9次尝试后停止循环。（此外，打印出变量的值或使用调试器，以便在预期的情况下验证它们是否正在更改。）