JAVA - Abstraction

Question

I am little confused about abstraction in java.

I have checked many pages stating that abstraction is data hiding(Hiding the implementation).

What I understa

Answer 1

It is not hiding the information from you, but from the client of your abstraction. Take a look at this example.

public class Demo {
    Client client = new Client(new Implementation());
}

public interface Abtraction {
    void doWork();
}

public class Implementation implements Abtraction{
    @Override
    public void doWork() {
        //doingTheWork
    }
}

public class Client{
    private Abtraction theAbstraction;

    public Client(Abstraction theAbstraction){
        this.theAbstraction = theAbstraction;
    }
}

The class Client is unaware of the implementation of Abstraction, this means that the Demo class can provide different implementations of Abstraction without messing up the Client.