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package com.shxy.code;
import java.io.BufferedOutputStream;  
import java.io.BufferedReader;  
import java.io.File;  
import java.io.FileInputStream;  
 
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.io.InputStream;  
import java.io.InputStreamReader;  
import java.util.zip.Adler32;  
import java.util.zip.CheckedOutputStream;  
 
import org.apache.tools.zip.ZipEntry;  
import org.apache.tools.zip.ZipOutputStream;  
 
/** 
 * ÎļþÏà¹Ø²Ù×÷£¨£© 
 * @author gaoyusi 
 * 
 */ 
public class FileHelper {  
 
    /** 
     * ½«ÎļþÓÉÖ¸¶¨Â·¾¶¿½±´µ½Ö¸¶¨Â·¾¶ 
     * Èç¹ûÖ¸¶¨Â·¾¶Îļþ²»´æÔÚ£¬Ôò×Ô¶¯´´½¨¸ÃÎļþ 
     * @param src ÎļþµÄԴ·¾¶ 
     * @param dis Îļþ¸´ÖƵÄÄ¿µÄ·¾¶ 
     */ 
    public void copyFile(String src, String dis) throws IOException{  
        File srcFile=new File(src);  
        File disFile=new File(dis);  
        //ÕÒ²»µ½Ô´Îļþ  
        if(!srcFile.exists()){  
            throw new IOException("ÕÒ²»µ½Ô´Îļþ£¡");  
        }  
        try{  
            //create distinct file  
            createNewFile(disFile);  
   


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package com.yzy;
import java.util.regex.*;
public class Test {
 /**
  * @param args
  */
 public static void main(String[] args) {
  Pattern p=Pattern.compile("^[a-z]+");
  Matcher m=p.matcher("a233"); //true
  //Matcher m=p.matcher("2233") ......

Effective Java ѧϰ±Ê¼Ç(4)

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ÓÐʱ£¬ÎÒÃÇ»áдһЩ¹¤¾ßÀ࣬Èçjava.lang.Math »òÊÇ java.util.Arrays, ÕâЩÀàÖж¼ÊǾ²Ì¬º¯Êý£¬ÔÚÉè¼ÆµÄʱºò£¬ÕâЩÀಢ²»ÊÇÓÃÀ´±»ÊµÀý»¯µÄ¡£Õâ¸öʱºò£¬¾ÍºÜÓбØÒª°Ñ¹¹Ô캯Êý˽Óл¯¡£
public class UtilityClass {
private UtilityClass() {
throw new Assertion ......

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JavaÃæÏò¶ÔÏó±à³Ì 6.3 ·½·¨¸²¸Ç£¨Override£©

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