Java 调用nextLine（）的扫描程序不会发出NoSuchLineException

我正在尝试制作一个游戏，询问用户的名字，对这个名字表示怀疑，然后问用户三个问题，这是我的代码，上面有三个问题中的两个

private static final Scanner console = new Scanner(System.in);

public static void main(String[] args) {

    System.out.println("Hello user! what is your name? ");
    String Name = console.nextLine();
    System.out.println("Really? " + Name + " is too weird to be a real name.");
    confirmation();
    Mascot();
    Fence();
    System.out.println("Thank you for playing the demo");

    console.close(); 
}

public static void confirmation() {
    
    System.out.print("is that REALLY your name? (type Y/N) ");
    String yN = console.nextLine();
    String a = yN;
    Scanner scanner = new Scanner(a);
    if (scanner.hasNext("Y")) {
        System.out.println("I still dont belive you, so you will have to answer 3 riddles before you can continue to the game");
    } else{
        calledIt();
    }
    scanner.close();
     
}

public static void calledIt() {
    
    System.out.println("I knew it!");
    System.out.print("whats your real name? ");
    String realName =console.nextLine();
    System.out.println("" + realName + "sounds like a real name, but you lied the first time so you will need to answer riddles 3 to continue to the game");
    
}

public static void Mascot() {
    
    System.out.println("what Is our school mascot?");
    String b = console.nextLine();
    if (b.toLowerCase().contains("tiger")){
        System.out.println("Good, next riddle.");

    } else{
        System.out.println("You have failed");
    }
    
}
public static void Fence() {
    System.out.println("What runs around the whole yard without moving?");
    String c = console.nextLine();
    if (c.toLowerCase().contains("fence")){
        System.out.println("Good, next riddle.");

    } else{
        System.out.println("You have failed");
    }
    
}

}

这是当前输出（具有随机名称）

我希望它在确认（）中接受Y或Y作为“是输入”。

---

如果有任何问题回答不正确，程序需要停止，而不是继续下一个问题。因为我与bob回答了第一个问题，所以应该说您失败了，然后停止。

因为您在

确认（）中调用
scanner.close（）
终止了
系统。
流

method，您无法再读取流，因此调用

String realName=console.nextLine（）；

将发出异常

---

解决方案：删除代码中的

scanner.close（）

调用。

与其创建多个扫描仪实例，不如准备一个从System.in读取，并在所有工作完成后将其关闭

private static final Scanner console = new Scanner(System.in);

public static void main(String[] args) {

    System.out.println("Hello user! what is your name? ");
    String Name = console.nextLine();
    System.out.println("Really? " + Name + " is too weird to be a real name.");
    confirmation();
    Mascot();
    System.out.println("Thank you for playing the demo");

    console.close(); 
}

public static void confirmation() {
    
    System.out.print("is that REALLY your name? (type Y/N) ");
    String yN = console.nextLine();
    String a = yN;
    Scanner scanner = new Scanner(a);
    if (scanner.hasNext("Y")) {
        System.out.println("I still dont belive you, so you will have to answer 3 riddles before you can continue to the game");
    } else{
        calledIt();
    }
    scanner.close();
     
}

public static void calledIt() {
    
    System.out.println("I knew it!");
    System.out.print("whats your real name? ");
    String realName =console.nextLine();
    System.out.println("" + realName + "sounds like a real name, but you lied the first time so you will need to answer riddles 3 to continue to the game");
    
}

public static void Mascot() {
    
    System.out.println("what Is our school mascot?");
    String b = console.nextLine();
    if (b.toLowerCase().contains("tiger")){
        System.out.println("Good, next riddle.");

    } else{
        System.out.println("You have failed");
    }
    
}

---

@MentalOverload，好的。您不需要关闭扫描仪的系统。在stream中，当您的程序关闭时，Java虚拟机将为您处理它。如何使它在声明您失败后停止程序

private static final Scanner console = new Scanner(System.in);

public static void main(String[] args) {

    System.out.println("Hello user! what is your name? ");
    String Name = console.nextLine();
    System.out.println("Really? " + Name + " is too weird to be a real name.");
    confirmation();
    Mascot();
    System.out.println("Thank you for playing the demo");

    console.close(); 
}

public static void confirmation() {
    
    System.out.print("is that REALLY your name? (type Y/N) ");
    String yN = console.nextLine();
    String a = yN;
    Scanner scanner = new Scanner(a);
    if (scanner.hasNext("Y")) {
        System.out.println("I still dont belive you, so you will have to answer 3 riddles before you can continue to the game");
    } else{
        calledIt();
    }
    scanner.close();
     
}

public static void calledIt() {
    
    System.out.println("I knew it!");
    System.out.print("whats your real name? ");
    String realName =console.nextLine();
    System.out.println("" + realName + "sounds like a real name, but you lied the first time so you will need to answer riddles 3 to continue to the game");
    
}

public static void Mascot() {
    
    System.out.println("what Is our school mascot?");
    String b = console.nextLine();
    if (b.toLowerCase().contains("tiger")){
        System.out.println("Good, next riddle.");

    } else{
        System.out.println("You have failed");
    }
    
}