Sentinel值关闭FileWriter（Java）

Question

我试图做一个基本的程序，允许用户创建一个文本文件并添加一个单词列表。当用户写入“停止”时 - 文件应该关闭。不幸的是，现在它只是一个无限循环。我在做什么错：

import java.util.Scanner; 
import java.io.*; 


    public class WordList 
    { 
public static void main(String[] args) throws IOException 
{ 
    System.out.println("What would you like to call your file? (include extension)"); 

    Scanner kb = new Scanner(System.in); // Create Scanner 

    String fileName = kb.nextLine(); // assign fileName to name of file 

    PrintWriter outputFile = new PrintWriter(fileName); // Create the file 

    String input; 

    System.out.println("Please enter the next word or stopnow to end"); //Prompt user for a word 

    input = kb.nextLine(); // assign input as the word 

    while (input != "stopnow") 

    { 
    outputFile.println(input); // print input to the file 

    System.out.println("Please enter the next word or stopnow to end"); //Prompt user for a word 

    input = kb.nextLine(); // assign input as the word 

    } 

    outputFile.close(); //Close the File 

    System.out.println("done!"); 




} 

} 

Answer 1

要检查字符串是否相等，使用.equals

while (!input.equals("stopnow"))  
    { 
    outputFile.println(input); // print input to the file  
    System.out.println("Please enter the next word or stopnow to end"); //Prompt user for a word 
    input = kb.nextLine(); // assign input as the word  
    } 

什么目前你正在做的是比较引用。