java识别一篇文章中某单词出现个数的方法

本文实例讲述了java识别一篇文章中某单词出现个数的方法。分享给大家供大家参考。具体如下：

1. java代码：

import java.io.datainputstream;
import java.io.fileinputstream;
import java.io.filenotfoundexception;
import java.io.ioexception;
import java.util.stringtokenizer;
import java.util.regex.matcher;
import java.util.regex.pattern;
public class select {
  public static void main(string[] args) {
    int num = 0;
    //定义：字节读取流
    fileinputstream fis;
    try {
      //此处的路径需要根据具体情况来进行修改
      fis = new fileinputstream("h:\\tankwar1.9\\src\\tank.java");
      datainputstream dis = new datainputstream(fis);
      string line = null;
      while ((line = dis.readline()) != null) {
        //创建字符解析器
         stringtokenizer st=new stringtokenizer(line,"!&(){}+-= ':;<> /");
         while(st.hasmoretokens()) { 
           string string=st.nexttoken();
           if(string.equals("if")) { num++; } }
        ;
      }
    } catch (filenotfoundexception e) {
      e.printstacktrace();
    } catch (ioexception e) {
      e.printstacktrace();
    }
    system.out.println(num);
  }
}

2. select.java：

import java.io.datainputstream;
import java.io.fileinputstream;
import java.io.filenotfoundexception;
import java.io.ioexception;
import java.util.stringtokenizer;
import java.util.regex.matcher;
import java.util.regex.pattern;
public class select {
  public static void main(string[] args) {
    int num = 0;
    //定义：字节读取流
    fileinputstream fis;
    try {
      fis = new fileinputstream("h:\\tankwar1.9\\src\\tank.java");
      datainputstream dis = new datainputstream(fis);
      string line = null;
      while ((line = dis.readline()) != null) {
        //创建字符解析类
         stringtokenizer st=new stringtokenizer(line,"!&(){}+-= ':;<> /");
         while(st.hasmoretokens()) { 
           string string=st.nexttoken();
           if(string.equals("if")) { num++; } }
        ;
      }
    } catch (filenotfoundexception e) {
      e.printstacktrace();
    } catch (ioexception e) {
      e.printstacktrace();
    }
    system.out.println(num);
  }
}

3. stringtokenizerdemo.java：

import java.util.*;
public class stringtokenizerdemo
{
  public static void main(string[] args)
  {
      string str1 = "hello world!this is java code,stringtokenizer demo.";
      //声明并初始化字符串str1
      string str2 = "how to use stringtokenizer?stringtokenizer?";
      //声明并初始化字符串str2
      stringtokenizer strt1 = new stringtokenizer(str1," ,.!");
      //创建stringtokenizer类的对象strt1,并构造字符串str1的分析器
      //以空格符、","、"."及"!"作为定界符
      stringtokenizer strt2 = new stringtokenizer(str2," ?");
      //创建stringtokenizer类的对象strt2,并构造字符串str2的分析器
      //以空格符及"?"作为定界符
      int num1 = strt1.counttokens();
      //获取字符串str1中语言符号的个数
      int num2 = strt2.counttokens();
      //获取字符串str2中语言符号的个数
      system.out.println("str1 has "+num1+" words.they are:");
      while(strt1.hasmoretokens())
      {  //利用循环来获取字符串str1中下一个语言符号,并输出
          string str = strt1.nexttoken();
          system.out.print("\""+str+"\" ");
      }
      system.out.println("\nstr2 has "+num2+" words.they are:");
      while(strt2.hasmoretokens())
      {  //利用循环来获取字符串str2中下一个语言符号,并输出
          string str = strt2.nexttoken();
          system.out.print("\""+str+"\" ");
      }
  }
}

希望本文所述对大家的java程序设计有所帮助。