java - 从字符串中提取每个单词

Question

我正在尝试计算字符串中的单词数，找到字符串中每个单词的长度，然后仅使用 String 类确定字符串中的最大单词。我不能使用数组。有谁知道从字符串中提取每个单词的方法？

Answer 1

int indexOfSpace = 0;
int nextIndexOfSpace = 0;

String sentence  = "This is a sentence";

int lastIndexOfSpace = sentence.lastIndexOf(" ");
while(indexOfSpace != lastIndexOfSpace){
    nextIndexOfSpace = sentence.indexOf(" ",indexOfSpace);  
    String word = sentence.subString(indexOfSpace,nextIndexOfSpace);
    System.out.println("Word: " + word + " Length: " + word.length());
    indexOfSpace = nextIndexOfSpace;
}

String lastWord = sentence.subString(lastIndexOfSpace);
System.out.println("Word: " + lastWord + " Length: " + lastWord.length());

您需要按照上述思路做一些事情。由于您的问题似乎是一个家庭作业问题，因此我不会努力调试它。这是我所能回答的似乎是一个家庭作业的问题。

调试它，使用它。

Answer 2

Scanner s= new Scanner("Put your string here");
while(s.hasNext()){
    String word= s.next();
}

仅使用字符串编辑：

String myString = "hello world how are you";
for (int i = 0,                   //start of word
     j = 0;                       //end of word
     i < myString.length();       //make sure we're in bounds
     i = j + 1) {                 //Start from where we left off plus one
                                  //to get rid of space we just found

    j = myString.indexOf(" ", i); //find the next space
    if (j == -1) {                //-1 means no more spaces so we're done
        break;
    }
    String word = myString.substring(i, j); //here is your word
}

Answer 3

使用StringTokenizer

String sentence = "This is a sentence"; 
StringTokenizer t = new StringTokenizer(sentence);
String word ="";
while(t.hasMoreTokens())
{
    word = t.nextToken();
    System.out.println(word);
}

输出应该是

This
is
a
sentence

Answer 4

这可以使用 split(" ")//将字符串（可能是一个句子）按空格拆分为单词并使用数组列表来存储 List words = Arrays.asList(sentence.split(" "));

Answer 5

一个原始版本，可能是有效的，可能是这样的。这假设单词之间有单个空格，包括结尾，可以轻松调整使其完美。

    int wordCount = 0;
    int maxWordLen = 0;
    String longestWord = null;

    if(input != null){//given word
        int currentWordStart = 0;
        for(int i = 0; i < input.length(); i++){
            char currentChar = input.charAt(i);
            if(' ' == currentChar){
                wordCount++;
                String currentWord = input.substring(currentWordStart, i);
                int currentWordLen = i - currentWordStart;
                System.out.println("Word: " + currentWord + ", Length: " + currentWordLen);
                currentWordStart = i + 1;
                if(maxWordLen < currentWordLen){
                    maxWordLen = currentWordLen;
                    longestWord = currentWord;
                }
            }
        }
    }

    System.out.println("Word count: " + wordCount);
    System.out.println("Longest word: " + longestWord + ", Length: " + maxWordLen);