Sumbody plis explain this statement

Question

An abstract method is a method that is declared without an implementation (without braces, and followed by a semicolon): abstract void walk();

Answer 1

abstract mean incomplete. You use them to implement something in your main code.

Eg. Class A {abstract void walk(); }
Class B : A { implement walk method here }

I don't know in java. In C# abstract can inherit but can't use by instantiation.

Answer 2

https://www.tutorialspoint.com/java/java_abstraction.htm

Answer 3

I'm not sure but...
classes are blueprints so u could create multiple objects based on it. when your objects have different behavior. you just create an abstract behavior (method) for it in the class . and in your objects you give them specific behavior