e051. computing elapsed time.txt

这里面包含了一百多个JAVA源文件

// Get current time
    long start = System.currentTimeMillis();
    
    // Do something ...
    
    // Get elapsed time in milliseconds
    long elapsedTimeMillis = System.currentTimeMillis()-start;
    
    // Get elapsed time in seconds
    float elapsedTimeSec = elapsedTimeMillis/1000F;
    
    // Get elapsed time in minutes
    float elapsedTimeMin = elapsedTimeMillis/(60*1000F);
    
    // Get elapsed time in hours
    float elapsedTimeHour = elapsedTimeMillis/(60*60*1000F);
    
    // Get elapsed time in days
    float elapsedTimeDay = elapsedTimeMillis/(24*60*60*1000F);