[Java/UnitTest] Calculator Class

In the Main\Java, we add a class

/**
 * Created by nhien.truong on 2/27/14.
 */
public class Calculator {

    /**
     * return a/b
     * @param a
     * @param b
     * @return
     */
    public double  divide(double a, double b){
        return a/b;
    }

    /**
     * return a+b
     * @param a
     * @param b
     * @return
     */
    public double add(double a, double b){
        return a+b;
    }

    /**
     * return a*b
     * @param a
     * @param b
     * @return
     */
    public double multiply(double a, double b){
        return a*b;
    }

    /**
     * return subtract
     * @param a
     * @param b
     * @return
     */
    public double subtract(double a, double b){
        return a-b;
    }
}