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。