Creating an instance using the class name and calling constructor

I have some requirement to create a instance of a dynamic class(At run time).

Means is there any such ways to create an instance of a particular class by passing the class name dynamically and pass parameters to its constructor too.


You can do it the following way

Class<?> clazz = Class.forName(className);

Constructor<?> constructor= clazz.getConstructor(String.class);

Object obj = constructor.newInstance(new Object[] { constructorArgument });

This will only work for a single string parameter, but you can modify it easily.

Note that the class name has to be a fully-qualified one, i.e. including the namespace. For nested classes, you need to use a dollar (as that's what the compiler uses). For example:

package kodetalk;

public class Clazz


    public static class Nested {}


To obtain the Class object for that, you'd need Class.forName("kodetalk.Clazz$Nested").

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