扫描仪永远不会关闭

Question

我正在开发游戏，但扫描仪遇到了一个小问题。我收到了一个从未关闭过的资源泄漏扫描程序。

但是我认为我的扫描仪在没有关闭之前就可以正常工作。但是现在不是。有人可以帮我吗？

import java.util.Scanner;

public class Main {

    public static final boolean CHEAT = true;

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        int amountOfPlayers;
        do {
            System.out.print("Select the amount of players (1/2): ");
            while (!scanner.hasNextInt()) {
                System.out.println("That's not a number!");
                scanner.next(); // this is important!
        }

        amountOfPlayers = scanner.nextInt();
        while ((amountOfPlayers <= 0) || (amountOfPlayers > 2));
        System.out.println("You've selected " + amountOfPlayers+" player(s)."); 
    }
}

Answer 1

我假设您正在使用Java 7，因此会收到编译器警告，当您不关闭资源时，通常应在finally块中关闭扫描程序。

Scanner scanner = null;
try {
    scanner = new Scanner(System.in);
    //rest of the code
}
finally {
    if(scanner!=null)
        scanner.close();
}

甚至更好：使用新的 Try with
resource语句

：

try(Scanner scanner = new Scanner(System.in)){
    //rest of your code
}