1. The equals method in Java compares object references using ==, while for String it compares character values using equals(). The getClass() and instanceof operators can be used to check the type of an object. 2. Polymorphism allows a parent class reference to refer to a child class object without knowing the exact type. 3. Java APIs like String, ArrayList, HashMap are commonly used generic collections that can store different object types.

1.  TIPS
 Java TIPS
Java α Java
Java
1.
java.lang.Object equals ==
java.lang.String ==
equals java.lang.String
equals String char
getClass instanceof
getClass java.lang.Class
instanceof
getClass true instanceof
true
2.
A B A B
A B
B A

2. 3.
Java API
String
String
4.
Eclipse Serialize
5.
Swing

Java API ArrayList HashMap
Vector ArrayList TreeMap
HashMap HashMap



Exception
 GUI
GUI GUI

3. GUI
GUI

System.out.println
Java JUnit


1.
GRASP
2.
3.
Visitor
4. package private
protected package private
 /GRASP

4. GRASP
 GOF
※ GOF
new
new
Factory
 GOF
 GOF

 Dependency Injection
DI XML XML
DI DI
XML

5.  Aspect Oriented Programing
AOP OOP
Aspect OOP
…
7
100 200
AOP
100 1
AOP
 O/R
OOP RDBMS
OOP RDBMS
OOP RDBMS O/R
Object RDBMS O/R
RDBMS
 Java
 JDK 5.0
Sun Ease of Development
j2se1.5.x
JDK 5.0
Generics for foreach
 Java SE 6.0 Javascript
Java SE 6.0
 Swing Apprication Framework

6. Swing Java SE 7.0
API
ver0.2
 Web
 Java
Java Form
G1
Java Servlet Java
HTML Java JSP
 Web
SOAP XML
REST HTTP CRUD

 Oracle
Oracle
Oracle
Oracle Sequence
Oracle
SGA

ER
CREATE