Overriding method

Hi

In Java I have written the code

class BaseClass
{
	public void Display()
	{
		System.out.println("This is the method of base class");
	}
}

class ChildClass extends BaseClass
{	
	public void Display()
	{
		System.out.println("This is the method of child class");
	}
}

class MainClass
{
	public static void main(String args[])
	{		
		ChildClass c = new ChildClass();
		c.Display();
	}
}

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Here I have declared method Display() in the ChildClass class. Is this the way we can override a method. Aren't we using any keyword like override for overriding the method?