Instantiate a class by name stores in String

For beginners like me that are not very familiar with object oriented concepts, it might be impossible to imagine that Java has a capability to instantiate a class by its name stored in a string variable. However, this is totally possible in Java or even in other programming languages with utilizing reflector/reflection concept.

Take a look at below example,

	public class A {
	private int x;

	public void setX(int x) {
	this.x = x;
	}

	public int getX() {
	return this.x;
	}
	}

view raw A.java hosted with ❤ by GitHub

Now the objective is to create an instance of class A which its name stored in variable, this code does that.

	public class Test {
	public void main(String[] args) {
	String className = "A";
	Class myClass = Class.forName(className);
	//Now need to make an object
	// This is a general Object type, must convert to call method.
	Object obj = myClass.newInstance();
	A aClass = (A) obj;
	//Shorter way
	A aClass = (A) Class.forName(className).newInstance();
	}
	}