Get method by parameter type

import java.lang.reflect.Method;

public class Main {
  public static void main(String[] args) throws Exception {
    MyClass object = new MyClass();
    Class clazz = object.getClass();

    Method method = clazz.getMethod("add", new Class[] { int.class, int.class });
    Object result = method.invoke(object, new Object[] { 10, 10 });
    System.out.println("Result = " + result);

    method = clazz.getMethod("multiply", new Class[] { int.class, int.class });
    result = method.invoke(object, new Object[] { 10, 10 });
    System.out.println("Result = " + result);

  }

}
class MyClass{

  public int add(int numberA, int numberB) {
    return numberA + numberB;
  }

  public int multiply(int numberA, int numberB) {
    return numberA * numberB;
  }

  public double div(int numberA, int numberB) {
    return numberA / numberB;
  }
}