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JAVA #24 – Abstract Classes in Java

Abstract Classes An abstract class is a class that is declared abstract—it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed. abstract class GraphicObject { int x, y; ... void moveTo(int newX, int newY) { ... } void draw() { . . …

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JAVA #19 – Access Modifiers and More on Classes

Controlling Access to Members of a Class Access level modifiers determine whether other classes can use a particular field or invoke a particular method. There are two levels of access control: At the top level—public, or package-private (no explicit modifier). At the member level—public, private, protected, or package-private (no explicit modifier). A class may be declared …

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