Avoid switch-case condition using design patterns

I have a few classes which represent arithmetic operations (Plus, Minus, Pow...) in Java which extend the same abstract class Operator but they differ in one method -calculate.

I'm trying to find a way to avoid the switch-case conditions in order to implement these classes in the right way using design patterns (new to design patterns), but how do I do it? Or is the switch-case statement is the right way to implement it?

here is the abstract class:

public abstract class Operator {

    private int a, b;
    
    public Operator(int a, int b){
        this.a = a;
        this.b = b;
    }
    
    public float calculate() {
        // here I want to return the result depending on the operator. If Plus extends Operator then the returned value is this.a + this.b
    }
    
    public void print() {
        System.out.println("This is the result : %f", this.calculate());
        
    }
}