Abstract Methods at a glance

Abstract method is a method which does not have any body (i.e. implementation).

• Abstract class means it can not be extended(instantiated)
• Abstract method means it should be overridden.

Abstract method examples -

public void erase(); --- ABSTRACT METHOD DOES NOT SPECIFY BODY,NO BRACES ALSO.
Some examples of abstract methods are :

int area();
private String brand();

SYNTAX : (ACCESS MODIFIER) RETURN TYPE NAME OF METHOD() SEMI COLON

• Access modifier is optional
• Return type is mandatory
• Method name is mandatory
• No Braces ,Should end with semicolon

If a method inside a class is declared as abstract ,that class should be marked as abstract,other wise it will throw an error.

package Test;
public class Board {
int height;
int width;
abstract void write(); --error message will be shown as "The abstract method write in type Board can only be defined by an abstract class"