Java If else statement on string value with Scanner input [duplicate]

I have made a calculator programme and with scanner I am taking the user input and storing that input in a variable and comparing that using if else statement. If the user says " Yes" then I will run specific method accrodingly else I will exit the programme. But I am not able to comare the user value here in If statement. Please have a quick look on my programme made:

public static void main(String[] args) {
        // TODO Auto-generated method stub
    
        
        Scanner sc = new Scanner(System.in);
        System.out.println("Do you want to use my calculator? Y/N");
        String value = sc.next();          
        
        if(value == "Y") {
        System.out.println("Which method you want to use? 1.Add 2.Subtract 3.Multiplication 4. Division 5.Modulus");
        String b = sc.next();
        
        System.out.println("Please enter 1st number");
        int x = sc.nextInt();
        
        System.out.println("Please enter 2nd number");
        int y = sc.nextInt();
    
        
        add(x, y);
        subtraction(x, y);
        multiplication( x, y);
        division(x, y);
        modulus (x,y);
        }
        else
        {
            String c = "You can exit the programme";
        }
      }