Java Coding Problems

Useful snippets of code

As a bonus, let's look at several snippets of code that are commonly needed when working with reflection and constructors.

First, let's fetch the number of available constructors:

Class<Car> clazz = Car.class;Constructor<?>[] cnstrs = clazz.getConstructors();System.out.println("Car class has "   + cnstrs.length + " constructors"); // 4

Now, let's see how many parameters have each of these four constructors:

for (Constructor<?> cnstr : cnstrs) {  int paramCount = cnstr.getParameterCount();  System.out.println("\nConstructor with "     + paramCount + " parameters");}

In order to get details about each parameter of a constructor, we can call Constructor.getParameters(). This method returns an array of Parameter (this class ...