//Calculator.java
public interface Calculator {
    public void add();
    public void minus();
}

//MyCalculatorAdapter.java
public class MyCalculatorAdapter implements Calculator {
    private Add addOperator;
    private Minus minusOperator;
    public MyCalculatorAdapter(Add addOperator, Minus minusOperator) {
        this.addOperator = addOperator;
        this.minusOperator = minusOperator;
    }
    public MyCalculatorAdapter(double arg1, double arg2) {
        this.addOperator = new Add(arg1, arg2);
        this.minusOperator = new Minus(arg1, arg2);
    }
    public void add() {
        addOperator.add();
    }
    public void minus() {
        minusOperator.minus();
    }
}