java 数字识别算法_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。