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我通过使用 log4j 和简单文件读写创建日志来比较 Java 程序延迟

     String content = "Writing";

    File file = new File("D://filename.txt");

    // if file doesnt exists, then create it
    if (!file.exists()) {
        file.createNewFile();
    }

    FileWriter fw = new FileWriter(file);
    BufferedWriter bw = new BufferedWriter(fw);


    long startTimeF=System.nanoTime();
    for(int i=0;i<10;i++)   
    {
        bw.write(content);

    }
    bw.close();
    long endTimeF=System.nanoTime();
    System.out.println("Time elapsed for file write:"+(endTimeF-startTimeF));
    long startTimeL=System.nanoTime();
    for(int i=0;i<10;i++)   
    {
        _logger.info("Writing..:"+strDate); }
    long endTimeL=System.nanoTime();

    System.out.println("Time elapsed for logger    ="+(endTimeL-startTimeL));

o / p：文件写入经过的时间：1826647记录器经过的时间= 3909112

假设我交换我喜欢的台词

长 startTimeL=System.nanoTime();

    for(int i=0;i<10;i++)   
    {
        _logger.info("writing..:"+strDate); }
    long endTimeL=System.nanoTime();

    System.out.println("Time elapsed for logger    ="+(endTimeL-startTimeL));

    long startTimeF=System.nanoTime();
    for(int i=0;i<10;i++)   
    {
        bw.write(content);

    }
    bw.close();
    long endTimeF=System.nanoTime();
    System.out.println("Time elapsed for file write:"+(endTimeF-startTimeF));

o / p：记录器经过的时间= 4018071文件写入经过的时间：3115210

 What cause to get different output by only inter changing lines....(using Asynchronous Logging) ?
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