计算字符串方法中的单词?

I was wondering how I would write a method to count the number of words in a java string only by using string methods like charAt, length, or substring.

我想知道如何编写一个方法，仅通过使用charAt、length或子字符串等字符串方法来计算java字符串中的单词数。

Loops and if statements are okay!

循环和if语句都可以!

I really appreciate any help I can get! Thanks!

我真的很感激我能得到的任何帮助!谢谢!

19 个解决方案

#1

public static int countWords(String s){

    int wordCount = 0;

    boolean word = false;
    int endOfLine = s.length() - 1;

    for (int i = 0; i < s.length(); i++) {
        // if the char is a letter, word = true.
        if (Character.isLetter(s.charAt(i)) && i != endOfLine) {
            word = true;
            // if char isn't a letter and there have been letters before,
            // counter goes up.
        } else if (!Character.isLetter(s.charAt(i)) && word) {
            wordCount++;
            word = false;
            // last word of String; if it doesn't end with a non letter, it
            // wouldn't count without this.
        } else if (Character.isLetter(s.charAt(i)) && i == endOfLine) {
            wordCount++;
        }
    }
    return wordCount;
}

#2

This would work even with multiple spaces and leading and/or trailing spaces and blank lines:

这甚至适用于多个空格和前导和/或后置空格和空行:

String trim = s.trim();
if (trim.isEmpty())
    return 0;
return trim.split("\\s+").length; // separate string around spaces

Hope that helps. More info about split here.

希望有帮助。更多关于拆分的信息。

#3

Hi I just figured out with StringTokenizer like this:

大家好，我刚刚用StringTokenizer算出

String words = "word word2 word3 word4";
StringTokenizer st = new Tokenizer(words);
st.countTokens();

#4

Simply use ,

简单的使用,

str.split("\\w+").length ;

#5

public static int countWords(String str){
        if(str == null || str.isEmpty())
            return 0;

        int count = 0;
        for(int e = 0; e < str.length(); e++){
            if(str.charAt(e) != ' '){
                count++;
                while(str.charAt(e) != ' ' && e < str.length()-1){
                    e++;
                }
            }
        }
        return count;
    }

#6

 private static int countWordsInSentence(String input) {
    int wordCount = 0;

    if (input.trim().equals("")) {
        return wordCount;
    }
    else {
        wordCount = 1;
    }

    for (int i = 0; i < input.length(); i++) {
        char ch = input.charAt(i);
        String str = new String("" + ch);
        if (i+1 != input.length() && str.equals(" ") && !(""+ input.charAt(i+1)).equals(" ")) {
            wordCount++;
        }
    }

    return wordCount;
 }

#7

Algo in O(N)

算法在O(N)

 count : 0;

 if(str[0] == validChar ) :
      count++;
 else :
      for i = 1 ; i < sizeOf(str) ; i++ :

          if(str[i] == validChar AND str[i-1] != validChar)

             count++;

          end if;

      end for;

 end if;

 return count;

#8

    import com.google.common.base.Optional;
    import com.google.common.base.Splitter;
    import com.google.common.collect.HashMultiset;
    import com.google.common.collect.ImmutableSet;
    import com.google.common.collect.Multiset;

    String str="Simple Java Word Count count Count Program";
    Iterable<String> words = Splitter.on(" ").trimResults().split(str);


    //google word counter       
    Multiset<String> wordsMultiset = HashMultiset.create();
    for (String string : words) {   
        wordsMultiset.add(string.toLowerCase());
    }

    Set<String> result = wordsMultiset.elementSet();
    for (String string : result) {
        System.out.println(string+" X "+wordsMultiset.count(string));
    }


add at the pom.xml
<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>r09</version>
</dependency>

#9

Counting Words in a String:
This might also help -->

计算字符串中的单词:这可能也有帮助——>

package data.structure.test;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class CountWords {

    public static void main(String[] args) throws IOException {
// Couting number of words in a string
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("enter Your String");
        String input = br.readLine(); 

        char[] arr = input.toCharArray();
        int i = 0;
    boolean notCounted = true;
    int counter = 0;
    while (i < arr.length) {
        if (arr[i] != ' ') {
            if (notCounted) {
                notCounted = false;
                counter++;
            }
        } else {
            notCounted = true;
        }
        i++;
    }
    System.out.println("words in the string are : " + counter);
}

}

#10

Use

使用

myString.split("\\s+");

This will work.

这将工作。

#11

public class TestStringCount {

  public static void main(String[] args) {
    int count=0;
    boolean word= false;
    String str = "how ma ny wo rds are th ere in th is sente nce";
    char[] ch = str.toCharArray();
    for(int i =0;i<ch.length;i++){
        if(!(ch[i]==' ')){
            for(int j=i;j<ch.length;j++,i++){
                if(!(ch[j]==' ')){
                    word= true;
                    if(j==ch.length-1){
                        count++;
                    }
                    continue;
                }
                else{
                    if(word){
                        count++;
                    }
                    word = false;
                }
            }
        }
        else{
            continue;
        }
    }
    System.out.println("there are "+(count)+" words");      
    }
}

#12

import java.util.; import java.io.;

进口java.util。;进口. io .;

public class Main {

公开课主要{

public static void main(String[] args) {

    File f=new File("src/MyFrame.java");
    String value=null;
    int i=0;
    int j=0;
    int k=0;
try {
    Scanner  in =new Scanner(f);
    while(in.hasNextLine())
    {
    String a=in.nextLine();
    k++; 
    char chars[]=a.toCharArray();
    i +=chars.length;
    }
    in.close();
    Scanner in2=new Scanner(f);
    while(in2.hasNext())
            {

        String b=in2.next();
        System.out.println(b);
        j++;
            }
   in2.close();

    System.out.println("the number of chars is :"+i);
    System.out.println("the number of words is :"+j);
    System.out.println("the number of lines is :"+k);





}
catch (Exception e) {
    e.printStackTrace();

}


}

}

}

#13

There is a Simple Solution You can Try this code

有一个简单的解决方案，您可以尝试这段代码

    String s = "hju   vg    jhdgsf  dh gg    g g  g  ";

    String[] words = s.trim().split("\\s+");

    System.out.println("count is = "+(words.length));

#14

public static int countWords(String input) {
        int wordCount = 0;
        boolean isBlankSet = false;
        input = input.trim();

        for (int j = 0; j < input.length(); j++) {
            if (input.charAt(j) == ' ')
                isBlankSet = true;
            else {
                if (isBlankSet) {
                    wordCount++;
                    isBlankSet = false;
                }
            }

        }

        return wordCount + 1;
    }

#15

My idea of that program is that:

我对这个项目的想法是:

package text;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class CoutingWords {

    public static void main(String[] args) throws IOException {
        String str;
        int cWords = 1;
        char ch;

        BufferedReader buffor = new BufferedReader(new InputStreamReader(System.in));

        System.out.println("Enter text: ");
        str = buffor.readLine();

        for(int i =0; i<str.length(); i++){
            ch = str.charAt(i);
            if(Character.isWhitespace(ch)){ cWords++; }
        }
        System.out.println("There are " + (int)cWords +" words.");
    }
}

#16

I'm new to * but I hope my code helps:

我是*网站的新手，但我希望我的代码能帮上忙:

private int numOfWordsInLineCounter(String line){

     int words = 0;

         for(int i = 1 ; i<line.length();i++){
         Character ch  = line.charAt(i-1);
         Character bch = line.charAt(i);
             if(Character.isLetterOrDigit(ch) == true && Character.isLetterOrDigit(bch)== false ) words++;
             if(i == line.length()-1 && Character.isLetterOrDigit(bch))words++;
         }
     return words;
 } 

#17

A string phrase normaly has words separated by space. Well you can split the phrase using the spaces as separating characters and count them as follows.

一个字符串短语通常用空格隔开。你可以用空格来分隔短语，把字符数出来，如下所示。

import java.util.HashMap;

import java.util.Map;

public class WordCountMethod {

    public static void main (String [] args){

        Map<String, Integer>m = new HashMap<String, Integer>();
        String phrase = "hello my name is John I repeat John";
        String [] array = phrase.split(" ");

        for(int i =0; i < array.length; i++){
            String word_i = array[i];
            Integer ci = m.get(word_i);
            if(ci == null){
                m.put(word_i, 1);
            }
            else m.put(word_i, ci+1);
        }

        for(String s : m.keySet()){
            System.out.println(s+" repeats "+m.get(s));
        }
    }

} 

#18

Taking the chosen answer as a starting point the following deals with a few English language issues including hyphenated words, apostrophes for possessives and shortenings, numbers and also any characters outside of UTF-16:

以选定的答案为出发点，下面讨论了一些英语语言问题，包括连字符词、占位符和短字符、数字以及UTF-16之外的任何字符:

public static int countWords(final String s) {
    int wordCount = 0;
    boolean word = false;
    final int endOfLine = s.length() - 1;

    for (int i = 0; i < s.length(); i++) {
        // if the char is a letter, word = true.
        if (isWordCharacter(s, i) && i != endOfLine) {
            word = true;
            // if char isn't a letter and there have been letters before,
            // counter goes up.
        } else if (!isWordCharacter(s, i) && word) {
            wordCount++;
            word = false;
            // last word of String; if it doesn't end with a non letter, it
            // wouldn't count without this.
        } else if (isWordCharacter(s, i) && i == endOfLine) {
            wordCount++;
        }
    }
    return wordCount;
}

private static boolean isWordCharacter(final String s, final int i) {
    final char ch = s.charAt(i);
    return Character.isLetterOrDigit(ch)
            || ch == '\''
            || Character.getType(ch) == Character.DASH_PUNCTUATION
            || Character.isSurrogate(ch);
}

#19

if(str.isEmpty() || str.trim().length() == 0){
   return 0;
}
return (str.trim().split("\\s+").length);