Abstract Class In Java Programming Example Tutorial Code in Eclipse

About Abstract Class In Java Programming with Example, Tutorial and Code in Eclipse.

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Errors & Solutions:

* Issue with final abstract, e.g.
public final abstract class Calculator {
}

* Class cannot be both final and abstract or The class Calculator can be either abstract or final, not both
Solution: We can't put final and abstract together. While putting final can't subclass.
public abstract class Calculator {
}

* Issue with static abstract, e.g.
public static abstract class Calculator {
}

Illegal modifier for the class Calculator; only public, abstract & final are permitted

Solution:

public abstract class Calculator {
}

* Issue we can't instantiate abstract class
* Cannot instantiate the type Calculator
Solution: Don't try to create object of abstract class.
Calculator obj = new Calculator();

Issue, if you not implement the abstract method in abstract class while implementing

Solution: Implement abstract methods in implementation class what we have in abstract class.