java - 确定用户输入的句子中的第二个单词

Question

我正在尝试查找句子中输入的第二个单词。我已经确定了第一个单词，但无法找到如何获得第二个单词。这是我尝试过的:

    String strSentence = JOptionPane.showInputDialog(null,
            "Enter a sentence with at" + " least 4 words",
            "Split Sentence", JOptionPane.PLAIN_MESSAGE);

    int indexOfSpace = strSentence.indexOf(' ');

    String strFirstWord = strSentence.substring(0, indexOfSpace);
/*--->*/String strSecondWord = strSentence.substring(indexOfSpace, indexOfSpace);
    Boolean blnFirstWord = strFirstWord.toLowerCase().equals("hello");
    Boolean blnSecondWord = strSecondWord.toLowerCase().equals("boy");

    JOptionPane.showMessageDialog(null, "The sentence entered: " + strSentence 
            + "\nThe 1st word is " + strFirstWord
            + "\nThe 2nd word is " + strSecondWord
            + "\nIs 1st word: hello? " + blnFirstWord
            + "\nIs 2nd word: boy? " + blnSecondWord);

Answer 1

您正在将第二个单词从第一个空格移到第​​一个空格(它将为空)。我建议你一直读到第二个空格或结尾。

 int indexOfSpace2 = = strSentence.indexOf(' ', indexOfSpace+1);
 String strSecondWord = strSentence.substring(indexOfSpace+1, indexOfSpace2);

如果你可以使用 split，你就可以做到

 String[] words = strSentence.split(" ");
 String word1 = words[0];
 String word2 = words[1];