Category: Java

Control visibility with public, private, protected, and package-private.

Hide fields and expose controlled getters/setters.

Reuse behavior with extends and an “is-a” relationship.

Understand single, multilevel, and hierarchical inheritance in Java.

Replace a parent method in a subclass with @Override.

Use parent references to call overridden methods on child objects.

Solve problems by methods calling themselves with a base case.

Create blueprints with classes and instances with objects.

Initialize objects with constructors when using new.

Refer to the current object with this.