Question

我正在尝试打印一个演员列表，该程序正在打印所有名称但我收到错误。我需要帮助找到一种方法来打印程序将在姓氏之后结束while循环的名称。

以下是清单：

＆＃13;

Leonardo Dicaprio
Susan Sarandon
Tom Hanks
Robert De Niro
Barack Obama
Helen Keller
Katharine Cornell
Helen Hayes
John Laughlin
Mark Zuckerberg
Joe Lipari
Welker White

＆＃13;

这是我的计划：

＆＃13;

public void printActors() 
	
			throws FileNotFoundException
	{
		Scanner input = new Scanner(new File("actors"));
		 String line = null;
		 while ((line = input.nextLine()) != null) 
		   {
		       System.out.println(line);
		   }
		
	
	}

＆＃13;

这是输出：

＆＃13;

Leonardo Dicaprio
Susan Sarandon
Tom Hanks
Robert De Niro
Barack Obama
Helen Keller
Katharine Cornell
Helen Hayes
John Laughlin
Mark Zuckerberg
Joe Lipari
Welker White
Exception in thread "main" java.util.NoSuchElementException: No line found
	at java.util.Scanner.nextLine(Unknown Source)
	at Game.BaconGame.main(BaconGame.java:26)

＆＃13;

有人可以帮助我这样它可以打印列表上的名字并摆脱错误吗？

Answer 1

使用while (input.hasNextLine())检查输入流中是否存在行（如果找不到行，则Scanner不会返回null，它会抛出NoSuchElementException）< / p>

如果您只想阅读文件而不是解析，我强烈建议您使用FileReader和BufferedReader。

Answer 2

FileReader in = new FileReader("actors");
    BufferedReader br = new BufferedReader(in);
     String line=br.readLine() ;
    while (line != null) {
        System.out.println(line);
        line=br.readLine() ;
    }
    in.close();

或根据您的代码

Scanner input = new Scanner(new File("actors"));
while ((input.hasNextLine())) 
           {
               System.out.println(input.nextLine());
           }

Answer 3

请尝试以下代码：

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class Test {
    public static void main(String[] args) {
        BufferedReader bufferedReader = null;
        try {
            String line;
            bufferedReader = new BufferedReader(new FileReader("actors"));
            while ((line = bufferedReader.readLine()) != null) {
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (bufferedReader != null)
                    bufferedReader.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
}

Answer 4

    public void printActors() throws FileNotFoundException
    {
      Scanner input = new Scanner(new File("c:\\actors.txt"));

      while(input.hasNextLine())
      {

        System.out.println(input.nextLine());
      }
    }

试图从文本文件中打印列表？

4 个答案: