Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;

public class Main {
    public static void main(String[] argv) throws Exception {
        BufferedReader br = new BufferedReader(new FileReader("in.txt"));
        BufferedWriter bw = new BufferedWriter(new FileWriter("out.txt"));
        int i;
        do {
            i = br.read();
            if (i != -1) {
                if (Character.isLowerCase((char) i))
                    bw.write(Character.toUpperCase((char) i));
                else if (Character.isUpperCase((char) i))
                    bw.write(Character.toLowerCase((char) i));
                else
                    bw.write((char) i);
            }
        } while (i != -1);
        br.close();
        bw.close();
    }
}