In: Computer Science
In Java please.
Part I:
Part II:
Main.java
import java.util.*;
import java.lang.*;
public class Main
{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("enter any two strings");
        String s1 = sc.nextLine();
        String s2 = sc.nextLine();
        String con = s1+s2;
        System.out.println("concatenated string is: "+ con);
        if(s1.equalsIgnoreCase(s2))
        {
            System.out.println("Both strings are equal");
        }
        else{
            System.out.println("Both strings are equal");
        }
        System.out.println("String when converted to upper case:");
        System.out.println(s1.toUpperCase());
        System.out.println(s2.toUpperCase());
        System.out.println("after replacing d with e");
        System.out.println(s1.replace('d','e'));
        System.out.println(s2.replace('d','e'));
        System.out.println("enter third string");
        String s3 = sc.nextLine();
        if(s1.endsWith(s3))
        {
            System.out.println(s1+"ends with "+s3);
        }
       else{
            System.out.println(s1+" doesnt ends with "+s3);
        }
       if(s2.endsWith(s3))
       {
               System.out.println(s2+"ends with "+s3);
        }
       else{
            System.out.println(s2+"doesnt ends with "+s3);
        }
        
    }
}
PLEASE DO COMMENT IN CASE OF ANY
DOUBTS.