Answer:
Kindly go to the explanation part for the code you seek.
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<strLine.length();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());
}
}
}
