我无法让StringTokenizer将几行文本分解成单独的标记。输入的文字是

3
monkeys


但是,StringTokenizer显然将其解释为“ 3monkeys”。我需要它是“ 3”和“ monkeys”。因此,由于我需要将字符串“ 3”转换为整数,因此引发了NumberFormatException。

这是我到目前为止的代码。

    Scanner f = new Scanner( new FileInputStream("input.txt" )); // Yes, i have the actual input file path here, but I changed it for this question.
    PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("output.txt")));

    String temp = "";
    //String cString = "";

    while( f.hasNextLine() ) {
        String cString = f.nextLine();
        temp += cString;
    }
    StringTokenizer everythingTokens = new StringTokenizer( temp );
    String[] everything = new String[ everythingTokens.countTokens() ];

    for( int i = 0; i < everything.length; i++ ) {
        everything[ i ] = everythingTokens.nextToken();
    }

    int numberOfPeople = Integer.parseInt( everything[ 0 ] ); // Line where exception occurs.
    out.println( everything[ 0 ] );


错误信息是这个

Exception in thread "main" java.lang.NumberFormatException: For input string: "3monkeys"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:492)
at java.lang.Integer.parseInt(Integer.java:527)
at gift1.main(gift1.java:32)
Java Result: 1


为什么会发生这种情况,我该如何解决?

最佳答案

当您通过temp += cString将每行追加到字符串时,您拥有的是“ 3” +“ monkeys”,即“ 3 Monkeys”。您可以通过在每行之后添加一个空格来解决此问题; temp += cString + " "

08-28 18:32