本文實例講述了java識別一篇文章中某單詞出現個數的方法。分享給大家供大家參考。具體如下：
1. java代碼：
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.regex.Pattern;public class Select { public static void main(String[] args) { int num = 0; //定義：字節讀取流 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) { //創建字符解析器 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; //定義：字節讀取流 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) { //創建字符解析類 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."; //聲明并初始化字符串str1 String str2 = "How to use StringTokenizer?StringTokenizer?"; //聲明并初始化字符串str2 StringTokenizer strT1 = new StringTokenizer(str1," ,.!"); //創建StringTokenizer類的對象strT1,并構造字符串str1的分析器 //以空格符、","、"."及"!"作為定界符 StringTokenizer strT2 = new StringTokenizer(str2," ?"); //創建StringTokenizer類的對象strT2,并構造字符串str2的分析器 //以空格符及"?"作為定界符 int num1 = strT1.countTokens(); //獲取字符串str1中語言符號的個數 int num2 = strT2.countTokens(); //獲取字符串str2中語言符號的個數 System.out.println("str1 has "+num1+" words.They are:"); while(strT1.hasMoreTokens()) { //利用循環來獲取字符串str1中下一個語言符號,并輸出 String str = strT1.nextToken(); System.out.print("/""+str+"/" "); } System.out.println("/nstr2 has "+num2+" words.They are:"); while(strT2.hasMoreTokens()) { //利用循環來獲取字符串str2中下一個語言符號,并輸出 String str = strT2.nextToken(); System.out.print("/""+str+"/" "); } }}希望本文所述對大家的java程序設計有所幫助。
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