1. Effective Java Source: Effective Java, Jason Arnold
Advanced Programming
Effective Java
Source: Effective Java, Jason Arnold
Advanced Programming. All slides copyright: Chetan Arora

2. Advanced Programming. All slides copyright: Chetan Arora
Coding Convention
Function and Class Names
Variable Names: Different convention for local, class and static variables
Length of each function
Object Oriented
Advanced Programming. All slides copyright: Chetan Arora

3. Advanced Programming. All slides copyright: Chetan Arora
Static Factory
public static Boolean valueOf(boolean b) {
return (b ? Boolean.TRUE : Boolean.FALSE); }
Unlike constructors they have names: Better Readability
Can return null
Can return a subclass: compact API.
Control number of instances floating around, Singletons
Caching
Advanced Programming. All slides copyright: Chetan Arora

4. Advanced Programming. All slides copyright: Chetan Arora
Singletons
Single Instance
Private Constructor
Static Factory
Advanced Programming. All slides copyright: Chetan Arora

5. Util Class
Private Constructor

6. public class Person {
private final Date birthDate;
public Person(Date birthDate) {
this.birthDate = birthDate; }
public boolean isBabyBoomer() {
Calendar gmtCal = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
gmtCal.set(1946, Calendar.JANUARY, 1, 0, 0, 0);
Date boomStart = gmtCal.getTime();
gmtCal.set(1965, Calendar.JANUARY, 1, 0, 0, 0);
Date boomEnd = gmtCal.getTime();
return birthDate.compareTo(boomStart) >= 0 && birthDate.compareTo(boomEnd) < 0;

7. Advanced Programming. All slides copyright: Chetan Arora
Static Blocks
class Person {
private final Date birthDate;
public Person(Date birthDate) {
this.birthDate = birthDate; }
//The starting and ending dates of the baby boom.
private static final Date BOOM_START;
private static final Date BOOM_END;
static {
Calendar gmtCal = Calendar.getInstance(TimeZone.getTimeZone("GMT"));
gmtCal.set(1946, Calendar.JANUARY, 1, 0, 0, 0);
BOOM_START = gmtCal.getTime();
gmtCal.set(1965, Calendar.JANUARY, 1, 0, 0, 0);
BOOM_END = gmtCal.getTime();
public boolean isBabyBoomer() {
return birthDate.compareTo(BOOM_START) >= 0 && birthDate.compareTo(BOOM_END) < 0;
Advanced Programming. All slides copyright: Chetan Arora