如何读取文件并按输出打印输出时间 [英] How DO YOU READ a FILE and PRINT OUT TIME as OUTPUT

问题描述

if（outputStream！= null）{

outputStream.close（）;

}

}



}

else {

扫描仪linReader =新扫描仪（输入文件）;

long start_time =系统。 currentTimeMillis（）;





while（linReader.hasNext（））

{

String line = linReader.nextLine（）;

System.out.println（line）;

}

linReader.close（ ）;

long estimatedTime = System.currentTimeMillis（） - start_time;

System.out.println（估计时间）;









}



}

}

>



我尝试过：



如何将时间打印出来

解决方案

你的初始提示是m essage（s）在错误的地方，应该是：

 System.out.print（ 输入输入文件名）; 
  String  inputfile = k.next（）; 
 System.out.print（ 输入输出文件名）; 
 字符串 outputfile = k.next（）; 

您还计算经过的时间在字符模式下处理文件时的每个字节应该是：

  int  c; 
  while （（c = inputStream.read（））！=  -   1 ）{
 outputStream.write（c）; 
}  //   while循环应该在这里结束 
  long  estimatedTime = System.currentTimeMillis（） -  start_time; 
 System.out.println（估计时间）; 

轻松发现1）正确缩进代码，2）仔细阅读你所写的内容。

if(outputStream != null){
outputStream.close();
}
}

}
else{
Scanner linReader = new Scanner(inputfile);
long start_time = System.currentTimeMillis();


while (linReader.hasNext())
{
String line = linReader.nextLine();
System.out.println(line);
}
linReader.close();
long estimatedTime = System.currentTimeMillis() - start_time;
System.out.println(estimatedTime);




}

}
}
>

What I have tried:

how do I will print it out the time

解决方案

You have your initial prompt message(s) in the wrong place, it should be:

System.out.print("Enter an input file name");
String inputfile = k.next();
System.out.print("Enter an output file name");
String outputfile = k.next();

You are also calculating the elapsed time for each byte when processing the file in character mode, it should be:

int c;
while((c = inputStream.read()) != -1) {
    outputStream.write(c);
} // while loop should end here
long estimatedTime = System.currentTimeMillis() - start_time;
System.out.println(estimatedTime);

Easily spotted by 1) indenting your code properly, and 2) reading carefully through what you have written.

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