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import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.RandomAccessFile;
import java.io.Reader;
/**
 *
 * ¶àÖÖ·½Ê½¶ÁÎ ......

JAVA½«ÄÚÈÝ×·¼Óµ½Îļþβ²¿

import java.io.FileWriter;
import java.io.IOException;
import java.io.RandomAccessFile;
/**
 * ½«ÄÚÈÝ×·¼Óµ½Îļþβ²¿
 */
public class AppendToFile
{
    /**
     * A·½·¨×·¼ÓÎļþ£ºÊ¹ÓÃRandomAccessFile
     *
    ......

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long startTime=System.currentTimeMillis(); //»ñÈ¡¿ªÊ¼Ê±¼ä 
doSomeThing(); //²âÊԵĴúÂë¶Î
long endTime=System.currentTimeMillis(); //»ñÈ¡½áÊøÊ±¼ä
System.out.println("³ÌÐòÔËÐÐʱ¼ä£º "+(end-start)+"ms"); ......

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JVMÆô¶¯Ê±»áÓÐÒ»¸öÓÉÖ÷·½·¨(public static void main( ......
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