Java中阅读句子的练习

Question

我正在尝试阅读 Java 中的一个句子并知道其中有多少个单词。这就是我所做的：

public class TestWords {
    public static void main(String[] args) {
        System.out.println("Give your phrase");
        Scanner extr=new Scanner(System.in);

        String Phrase;
        Phrase = extr.nextLine();
        int TotalSizeOfPhrase = Phrase.length();

        double number;
        for (int i=0; i < TotalSizeOfPhrase; i++)
        {
            if (Phrase[i] != number &&  Character.isWhitespace(s.charAt(i)))                    
            {
                TotalWords = TotalWords + 1;   
            }
        }
    }
}

我想知道如何编码：

if (Phrase[i]!= 'of an **arbitrary** number && white space')

然后：

TotalWords = TotalWords + 1;

因为当我输入这个时它标志着一个错误：

Character.isWhitespace(s.charAt(i))

Answer 1

有几个错误

    System.out.println("Give your phrase : ");
    Scanner scan = new Scanner(System.in);
    String Phrase;
    Phrase = scan.nextLine();
    System.out.println("Enter age : ");
    int number = scan.nextInt();
    // replace the number with empty string mean nothing
    Phrase = Phrase.replace(String.valueOf(number), "");
    Phrase = Phrase.concat(" "); // add space at end for loop calculation 
    int TotalSizeOfPhrase = 0;   // set tot =0
    int count=0; // a count variable to keep track of the word length
    for (int i=0; i<Phrase.length(); i++)
    {
        count++;
        if(Character.isWhitespace(Phrase.charAt(i)))
        {
            if(count-1>1){ // if size of word ( -1 is there for space size) 
                           // is greater than 1 than increment count
                TotalSizeOfPhrase=TotalSizeOfPhrase+1;                          
            }
            count=0;            
        }
    }
    System.out.println(TotalSizeOfPhrase);
    scan.close();// don't forget

输入：

Hello i'm 20 and I'm a beginner
20

输出：

5

Answer 2

我这样做的方法是用空格分割行（获取单词），将它们添加到数组中，然后得到这个数组长度，该长度等于字数。

Phrase = Phrase.trim(); //make sure there is no spaces at start or end of the line
String[] words = Phrase.split(" "); //get the words 
int word_count = words.length;  //get the word count in line

Answer 3

如果你想得到句子中的单词数，你可以使用这个代码：

int numberOfWords = Phrase.trim().isEmpty() ? 0 : trim.split("\\s+").length;

Answer 4

您可以使用此代码：

public static void main(String[] args) {
    System.out.println("Give your phrase");
    Scanner extr = new Scanner(System.in);

    String Phrase;

    Phrase = extr.nextLine();

    String[] words = Phrase.trim().split(" ");

    System.out.println("Totals Number Of Words: " + words.length);

    for (String word : words) {
        System.out.println(word.trim());
    }

}