Bonjour
en compilant mon prg,il sort erreur compilation
Exception in thread "main" java.lang.NullPointerException
at Main.main(Main.java:48)

aidez moi svp
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import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class Main 
{
	 @SuppressWarnings("null")
	public static void main(String[]args)
	 {
	  FileInputStream fis;
	  FileOutputStream fos;
	  BufferedInputStream bis = null;
	  BufferedOutputStream bos;
			 
	  try
	  {
	   fis=new FileInputStream(new File("test.txt"));
	   fos=new FileOutputStream(new File("test2.txt"));
	   bos=new BufferedOutputStream(new FileOutputStream(new File("test3.txt")));
	   byte[]buf=new byte[8];
	   long startTime=System.currentTimeMillis();
	   while(fis.read(buf)!=-1)
	   {
		   fos.write(buf);
	   }
	   System.out.println("Temps de lecture+écriture avec FileInputStream et FileOutputStream:"+(System.currentTimeMillis()-startTime));
	   startTime=System.currentTimeMillis();
	   while(bis.read(buf)!=-1)
	   {
		   bos.write(buf);
	   }
	   System.out.println("Temps de lecture+écriture avec BufferedInputStream et BufferedOutputStream:"+(System.currentTimeMillis()-startTime));
	   fis.close();
	   bis.close();
	  }
	  catch(FileNotFoundException e)
	  {
	   e.printStackTrace();
	  }
	 
	    catch(IOException e)
	    {
	     e.printStackTrace();
	    }
	   }
	  }