interface Java Keyword

The interface keyword is used to declare a new Java interface, which is a collection of methods.
Interfaces are a powerful feature of the Java language. Any class may declare that it implements one or more
interfaces, meaining it implements all of the methods defined in those interfaces.

Examples

public interface IPolygon
{
public float getArea();
public int getNumberOfSides();
public int getCircumference();
}

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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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