Calculator Service

public class CalcService {
    // declare input user input vars and operator
    private double a;
    private double b;
    private String operator;

    // getters
    public double getA() {
        return this.a;
    }
    public double getB() {
        return this.b;
    }
    public String getOperator() {
        return this.operator;
    }

    // setters
    public void setA(double a) {
        this.a = a;
    }
    public void setB(double b) {
        this.b = b;
    }
    public void setOperator(String operator) {
        this.operator = operator;
    }
}