Java - 如何清除文本文件而不删除它？ [英] Java - How to Clear a text file without deleting it?

问题描述

我想知道清除文件的最好方法是什么。我知道，Java自动创建一个文件与

  f = new Formatter（jibberish.txt）; 
 s =新的扫描仪（jibberish.txt）; 
  

如果不存在。但是如果存在，我每次运行该程序时都要清除它？这就是我想知道的：再说一遍，如何清除已经存在的文件只是空白？
这是我在想什么：

pre $ public $ clearFile（）{
//通过（s.hasNext（））{
f.format（）;



$ div $解析方案

如果你想清除文件而不删除可能是你可以解决这个问题$ / $>

  public static void clearTheFile（）{
 FileWriter fwOb = new FileWriter（FileName，false）; 
 PrintWriter pwOb = new PrintWriter（fwOb，false）; 
 pwOb.flush（）; 
 pwOb.close（）; 
 fwOb.close（）; 
 
 
 
 
 
 
编辑：抛出异常，所以需要捕获异常
 
I am wondering what the best way to clear a file is. I know that java automatically creates a file with 
f = new Formatter("jibberish.txt");  
s = new Scanner("jibberish.txt");
if none already exists. But what if one exists and I want to clear it every time I run the program? That is what I am wondering: to say it again how do I clear a file that already exists to just be blank? 
Here is what I was thinking: 
public void clearFile(){
    //go through and do this every time in order to delete previous crap
    while(s.hasNext()){
        f.format(" ");
    }
} 

解决方案
If you want to clear the file without deleting may be you can workaround this 
public static void clearTheFile() {
        FileWriter fwOb = new FileWriter("FileName", false); 
        PrintWriter pwOb = new PrintWriter(fwOb, false);
        pwOb.flush();
        pwOb.close();
        fwOb.close();
    }
Edit: It throws exception so need to catch the exceptions

                        
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