abstract Java Keyword

The abstract keyword may modify a class or a method.
An abstract class can be extended (subclassed) but cannot be instantiated directly.
An abstract method is not implemented in the class in which it is declared, but must be overridden in some
subclass.
Examples
public abstract class MyClass
{
}
public abstract String myMethod();

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case Java Keyword

The case is used to label each branch in a switch statement. Examples int arg = <some value>; switch (arg) { case 1: <statements> break; case 2: <statements> break; default: <statements> break; }

Java Program Structure

The Class Concept

A class is a collection of objects (or values) and a corresponding set of methods. A class encapsulates the data representation and makes data access possible at a higher level of abstraction. Example 1: A set of vehicles with operations for starting, stopping, driving, get km/liter, etc. Example 2: A time interval, start time, end time, duration, overlapping intervals, etc. Example 3: A string, upper case, compare, lower case, etc. str.equals(otherStr) – class/Java style strcmp(str, otherStr) – C style

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