Java File concatenation (Multiple file Handling)

Write a JAVA Program which reads a number of text files from the command line and concatenates the contents of the files into the last file entered on the command line.

Example:
Java Concatenate src1.txt src2.txt src3.txt dest.txt
All the contents of the source files should be concatenated and written in destination file.

SOLUTION: 

 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class FileConcatenation {
 public static void main(String[] args){
  
  if(args.length==0){
   System.out.println("Please enter file(s) name in proper format.");
   return;
  }
  
  //File object
  File[] file = new File[args.length];
  int i=0;
  
  for ( i=0; i < args.length; i++ ) {
   file[i] = new File(args[i]);
   //Checking file
   if(file[i].exists()){
    System.out.printf("\n%s exists.",file[i].getName());
    if(file[i].isDirectory()){
     System.out.println(" But it is not a file.");
    }
   }
   else
    System.out.printf("\n%s not exists.",file[i].getName()); 
  }
  System.out.println();
  
  //Reading all files and writing it to the last file
  try{
   //Opening last file for writing
   FileOutputStream fWrite = new FileOutputStream(args[args.length-1]);
   //Reading other files
   int r=0;
   FileInputStream[] fread = new FileInputStream[25];
  
   for ( i = 0; i < args.length - 1; i++ ) {
    fread[i] = new FileInputStream(args[i]);
    //Writing files.
    while((r = fread[i].read())!=-1){
     fWrite.write((char)r);
    }
   }
   System.out.println("\nWriting complected.");
   //Closing files
   fWrite.close();
   for ( i = 0; i < args.length - 1; i++)
    fread[i].close();
   
  }
  catch(Exception e) {
   System.out.println("\nWriting failed.");
  }
 }
}