This document provides an overview of fundamental Java concepts: - It describes the 8 primitive data types in Java including integers, floating-point numbers, characters, and booleans. - It explains that objects allow encapsulation of data and behaviors through classes and introduces core object-oriented principles like abstraction and polymorphism. - It covers key concepts like creating and using objects, writing classes, defining methods and constructors, and controlling program flow with conditional and repetition statements.

1. Java 1 fundamental reviews

35. Overloading Methods float tryMe (int x) { return x + .375; } Version 1 float tryMe (int x, float y) { return x*y; } Version 2 result = tryMe (25, 4.32) Invocation

49. Static Methods Because it is static, the method could be invoked as: value = Helper.triple (5); public static int triple (int num) { int result; result = num * 3; return result; } class Helper

57. Interfaces public interface Doable { public void doThis(); public int doThat(); public void doThis2 (float value, char ch); public boolean doTheOther (int num); } None of the methods in an interface are given a definition (body) interface is a reserved word A semicolon immediately follows each method header

59. Interfaces public class CanDo implements Doable { public void doThis () { // whatever } public void doThat () { // whatever } // etc. } implements is a reserved word Each method listed in Doable is given a definition