java识别一篇文章中某单词出现个数的方法

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);  }}

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);  }}

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+"/" ");      }  }}