Simple reflection examples.

	//Get class name from object
	public void getClassNameFromObject(){

		Foo f = new Foo();
		try {
			Log.d(TAG, f.getClass().getName());
		} catch ( Exception e){
			Log.d(TAG, ""+e);
		}
	}

--09 16:48:30.784 12379 12379 D hello   : com.test.simpletest.Foo

	//Invoke method on unknown object
	public void invokeMethod(){

		Foo f = new Foo();
		Method m;
		try {
		   m= f.getClass().getMethod("printFoo",new Class[0]);
		   m.invoke(f);
		} catch ( Exception e){
			Log.d(TAG, ""+e);
		}
	}

07-09 16:48:30.784 12379 12379 D hello   : Foo!

//Create object from Class instance
    public void createObjectFromClassInstance(){

        Class c = null;
        Foo f = null;
        //create instance of Class
        try {
            c = Class.forName("com.test.simpletest.Foo");
        } catch ( Exception e){
            Log.d(TAG, ""+e);
        }
        //Create instance of Foo
        try {
            f = (Foo) c.newInstance();
        } catch ( Exception e){
            Log.d(TAG, ""+e);
        }
        f.printFoo();
    }
	

07-09 16:53:33.591 12766 12766 D hello   : Foo!

//Get constructor and create instance
    public void getConstructorAndCreateInstance(){

        Class c = null;

        //create instance of Class
        try {
            c = Class.forName("com.test.simpletest.Foo");
        } catch ( Exception e){
            Log.d(TAG, ""+e);
        }
        //Create instance of Foo
        Foo f1 = null;
        Foo f2 = null;

        Constructor cons[] = c.getConstructors();

        //get all constructors
        try {
            f1 = (Foo) cons[0].newInstance();
            f2 = (Foo) cons[1].newInstance("Foo!");
        } catch ( Exception e){
            Log.d(TAG, ""+e);
        }
        f1.printS();
        f2.printS();
    }
	

07-09 17:19:04.317 14200 14200 D hello   : null
07-09 17:19:04.317 14200 14200 D hello   : Foo!

 출처 : https://www.javacodegeeks.com/2013/09/java-reflection-tutorial.html