Write a Java program which reads a text file and writes the content into a new file. During the read-write process, convert all the upper case letters into lower case ones. In other words, your programming task is to create a new file with the same content of the original file, only that all the upper case letters are converted into lower case ones in the new file.

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Explanation:

This is the Code to Copy:

package file;

import java. io. BufferedReader;

import java. io. BufferedWriter;

import java. io. DataInputStream;

import java. io. FileInputStream;

import java. io. FileWriter;

import java. io. InputStreamReader;

import java. util. Scanner;

public class file

{

public static void main (String []args)

{

try

{

System. out. print ("Type a file name: ");

//declare scanner for keyboard input

Scanner reader = new Scanner (System. in);

//scan the input file name

String infilename=reader. nextLine ();

//define file stream

FileInputStream fstream = new FileInputStream (infilename);

DataInputStream in = new DataInputStream (fstream);

//define the buffer reader

BufferedReader br = new BufferedReader (new InputStreamReader (in));

String outfilename = "output. txt";

FileWriter fileWriter = new FileWriter (outfilename);

//declare buffer writer for file write

BufferedWriter bufferedWriter = new BufferedWriter (fileWriter);

String strLine, filename;

int status = 0;

int i=0;

//read lines one by one from input file

while ((strLine = br. readLine ()) ! = null)

{

String temp="";

//for each character in a line

for (int k=0; k
{

char c;

c=strLine. charAt (k);

//if the character is uppercase

if (Character. isUpperCase (c))

//make the character lowercase and append it to the output line

temp + =Character. toLowerCase (c);

else

//character is not lowercase. append to the output line without changing it

temp + = c;

}

//write the line to the file

bufferedWriter. write (temp+"/n");

}

//close the input file

in. close ();

//close the output file

bufferedWriter. close ();

}

catch (Exception e)

{

//System. err. println ("Error: " + e. getMessage ());

}

}

}