java辨識一篇文章中某單字出現個數的方法

本文實例講述了java辨識一篇文章中某單字出現個數的方法。分享給大家供大家參考。具體如下：

1. java程式碼：

 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.StringTokenizer;import java.util.regex.Matcher;import java. .Pattern;public class Select { public static void main(String[] args) { int num = 0; //定義：位元組讀取流FileInputStream fis; try { //此處的路徑需要根據具體情況來進行修改fis = new FileInputStream("H://TankWar1.9//src/ /Tank.java"); DataInputStream dis = new DataInputStream(fis); String line = null; while ((line = dis.readLine()) != null) { //建立字元解析器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.StringTokenizer;import java.util.regex.Matcher;import java. .Pattern;public class Select { public static void main(String[] args) { int num = 0; //定義：位元組讀取流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) { //建立字元解析類別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."; //宣告並初始化字串str1 String str2 = "How to use StringTokenizer?StringTokenizer?"; //宣告並初始化字串str2 StringTokenizer strT1 = new StringTokenizer(str1," ,.!"); //建立StringTokenizer類別的物件strT1,並建構字串str1的分析器//以空格符號、","、"."及"!"定界符StringTokenizer strT2 = new StringTokenizer(str2," ?"); //建立StringTokenizer類別的物件strT2,並建構字串str2的分析器//以空格符及"?"為定界符int num1 = strT1.countTokens(); //取得字串str1中語言符號的個數int num2 = strT2.countTokens(); //取得字串str2中語言符號的個數System.out.println("str1 has "+num1+" words.They are:"); while(strT1.hasMoreTokens()) { //利用迴圈來取得字串str1中下一個語言符號,並輸出String str = strT1.nextToken(); System.out.print("/"" +str+"/" "); } System.out.println("/nstr2 has "+num2+" words.They are:"); while(strT2.hasMoreTokens()) { //利用迴圈來取得字串str2中下一個語言符號,並輸出String str = strT2.nextToken(); System.out.print("/""+str+"/" "); } }}

希望本文所述對大家的java程式設計有幫助。