abstract means what in Java?

[radhika743]

Friends, what is the meaning of abstract in Java?

We see abstract class, abstract method...

What is the word mean abstract?

[Laxminarayanak]

Abstract class is a class that provides some invariant functionality but leaves implementation of other members to inheriting classes. You can accomplish this through the use of abstract classes, which are classes that must be inherited.

Abstract classes are similar to interfaces, but share many features with classes. An abstract class cannot be instantiated on its own; it must be inherited first. Abstract classes can provide all, some, or none of the actual implementation of a class. Like interfaces, they can specify members that must be implemented in inheriting.

Abstract method is the element or member function in abstract class. Abstract Class should have at least one abstract mehtod in it.

The word Abstract in oops refers to hiding of the implementation.

[sk_kireeti]

I completely agree with Laxmi Narayana.

[avadhoot.dharmadhikari]

Take a simple example in real life different companies make bikes like as Hero-Honda,Bajaj,Suzuki,& so on.But in all example one commone thing is bike and so bike is the example of abstract.Actually abstract means we define one object or one behaviour which is must implement with your other behaviours.
Means bike is common to all but herohonds presends different functionality with bike,suzuke present some different function than other & so on.i hope you all understand what is abstract which i said.

[hemanthjava]

A class containing abstract method is must be declared as Abstract. It serves as a template. An Abstract class can't be instantiated. Abstract class must be extended/subclassed for it to be implemented. A class may be declared abstract even if it has no abstract methods. This prevents it from being instantiated. Abstract class is a class that provides some general functionality but leaves specific implementation to its inheriting classes.

Example of Abstract class:

abstract class AbstractClassExample{

protected String name;
public String getname() {
return name;
}
public abstract void function();
}

Example: Vehicle is an abstract class and Bus Truck, car etc are specific implementations

For more information check out

Abstract class and interface

[rk_ramakrishnamca]

Good Explanations.