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:
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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:
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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:
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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。