If Else if in Java [duplicate]

Dears, Could you please help me to solve these lines?

import java.util.Scanner;
public class InputOutput {
public static void main(String[] ar) {
Scanner inp = new Scanner(System.in);
System.out.println("Enter User Name");
String UserName=inp.nextLine();
 if (UserName=="Ramsid") {
    System.out.println("This is Admin User");
 }
 else if(UserName=="nv"){
    System.out.println("This is Operator User");
 }
 else if (UserName=="abc") {
    System.out.println("This is Super User");
 }
 else {
    System.out.println("User Not Exist");
      }
 }

I am getting always "User Not Exist"