Write a program in Java to demonstrate various operations on string functions.
import java.io.*;
import java.lang.*;

class StringFunctions {
    public static void main(String[] args)throws IOException {
        DataInputStream in = new DataInputStream(System.in);
        System.out.println("Enter first String: ");
        String str1 = in.readLine();

        System.out.println("Enter second string: ");
        String str2 = in.readLine();
        String str3 = str1 + str2;
        System.out.println("Concatenation of strings is: " + str3);

        boolean l = str1.equals(str2);
        System.out.println("String are equal: " + l);
        l = str1.equalsIgnoreCase(str2);
        System.out.println("String are equal ignoring Upper/Lower case: " + l);
        char loc = str1.charAt(2);
        System.out.println("Char at third location of second string is: " + loc);
        System.out.println("Enter the new string of length greater then 5: ");
        String nstr;
        nstr = in.readLine();
        if ((nstr.length())>=5) {
            String s = nstr.substring(2,5);
            System.out.println("Substring from second location to fifth location is: " + s);
            s = nstr.substring(2);
            System.out.println("Substring from second location: " + s);
            s = nstr.replace('a','m');
            System.out.println(s);
            char[] buf = new char[str2.length()];
            nstr.getChars(0,3,buf,0);

            System.out.println(buf);
            byte[] buf1 = new byte[str2.length()];
            nstr.getBytes(0,3,buf1,0);
            System.out.println(buf1);
        }
        else {
            System.out.println("Length of string is less than 5");
        }
    }
}

Output
Enter first String:
Rahul
Enter second string:
Salunkhe
Concatenation of strings is: RahulSalunkhe
String are equal: false
String are equal ignoring Upper/Lower case: false
Char at third location of second string is: h
Enter the new string of length greater then 5:
Salunkhe
Substring from second location to fifth location is: lun
Substring from second location: lunkhe
Smlunkhe
Sal
[B@1be6f5c3