How do I copy one file contains to another file

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
 
class CopyFileContentsInOtherFile {
 
 public static void main(String[] args) {
 
  try
  {
   File f1=new File(args[0]);
   File f2=new File(args[1]);
 
   if(f1.exists()==false)
   {
    System.out.println("Can't Copy Source File Not Exists");
    System.exit(0);
   }
   if(f2.exists()==true)
   {
    System.out.println("Can't Copy Destination File Exists");
    System.exit(0);
   }
 
   FileInputStream fis=new FileInputStream(f1);
   FileOutputStream fos=new FileOutputStream(f2);
 
   int x;
   while((x=fis.read())!=-1) {
    fos.write(x);
   }
   
   System.out.println("Contents of file '"+f1+"' are copied in '"+f2+"' successful...");
   fis.close();
   fos.close();
  }
  catch(Exception ee) { 
   System.out.println(ee);
  }
 }
 
}