停止扫描程序读取用户输入java？ [英] Stop scanner from reading user input java?

问题描述

我正在尝试编写此方法，该方法一直向用户读取，直到输入exit字样。我尝试了休息和循环;它不起作用。我正在尝试，但即使输入退出这个词，它也不会停止。任何想法如何解决这一问题？谢谢。

I am trying to write this method, which keeps reading from the user, until the word "exit" is inputted. I tried with a break and for loop; it didn't work. I was trying with while, but it does not stop even when the word "exit" is inputted. Any ideas how to fix this? Thanks.

public void read(Scanner scanner){

while(3<4){
String in = scanner.nextLine();
Scanner scanner_2 = new Scanner(in);

String name = null;

if(scanner_2.hasNext()){
  //create and add the user to the user container class
  name = scanner_2.next();
  System.out.println(name);
}

if(name == exit)
//stop or break the while loop
}
}

推荐答案

name == exit 错误。

你想要

name.equals(exit)

或

name.equals("exit")

取决于exit是变量还是字符串文字， 分别。在Java中， == 表示引用相等（例如，这两个引用是否指向内存中的相同地址），而。等于表示对象等效，开发人员在类中通常覆盖。

depending on whether exit is a variable or a string literal, respectively. In Java, == means reference equality (e.g Are these two references pointing to the same address in memory), whereas .equals means object equivalence, which is typically overriden in the class by the developer.

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