public class StrategyPattern {
    public static void main(String[] args) {
        Strategy add = new AddStrategy();
        Strategy subtraction = new SubtractionStrategy();
        Strategy multiply = new MultiplyStrategy();

        OperationContext context = new OperationContext(add);
        context.Operation(2022, 528);

        context = new OperationContext(subtraction);
        context.Operation(2022, 528);

        context = new OperationContext(multiply);
        context.Operation(2022, 528);
    }
}

class OperationContext {
    private Strategy strategy;

    public OperationContext(Strategy strategy) {
        this.strategy = strategy;
    }

    public void Operation(int a, int b) {
        strategy.TwoNumberOperation(a, b);
    }
}

interface Strategy {
    public void TwoNumberOperation(int a, int b);
}

class AddStrategy implements Strategy {

    @Override
    public void TwoNumberOperation(int a, int b) {
        System.out.println(a + b);
    }
}

class SubtractionStrategy implements Strategy {

    @Override
    public void TwoNumberOperation(int a, int b) {
        System.out.println(a - b);
    }
}

class MultiplyStrategy implements Strategy {

    @Override
    public void TwoNumberOperation(int a, int b) {
        System.out.println(a * b);
    }
}