Whats New in Java 5, 6, & 7 (Webinar Presentation - June 2013)

What’s New in Java 5, 6 & 7
Delivered by DevelopIntelligence

About DevelopIntelligence
Provide highly-customized, role-based, project-
centric learning solutions to software teams
Specialize in areas of Java, Open Source, Web
Development, and Mobile
Delivered training to over 40,000 engineers
worldwide
Headquartered in Boulder CO

About Kelby Zorgdrager
President of DevelopIntelligence
Working with and teaching
Java since 1996 (1.0.1)
Former Sun Microsystems Java Platform
engineer
Delivered training to over 5,000 engineers
worldwide
Copyright DevelopIntelligence LLC

Webinar Topics
In this presentation, we will cover:
Current State of Java
Newish Language Features
Questions at the end
DevelopIntelligence http://www.DevelopIntelligence.com 4

Objectives
When we are done, you should be:
Familiar with current state of Java
Aware of new features

Current State of Java

Java SE 5.0
Significant revamp of Java
Not largest revamp in terms of new APIs
Significance lies in new language features
Released Sept 2004 - Code named “Tiger”
EOL’d Oct 30, 2009
Current version 1.5 update 22

Java SE 6
Focused on refreshing APIs, internals, and
Scripting support
Released Dec 2006 - Code named “Mustag”

Java SE 7
Focused on simplifying
language, APIs, internals, and dynamic
language support
Released July 2011 - Code named “Dolphin”

Breadth of Java Across Versions
10DevelopIntelligence http://www.DevelopIntelligence.com
8 22 59 76 135 166 203 209202
477
1524
1840
2723
3279
3793
4024
0
500
1000
1500
2000
2500
3000
3500
4000
4500
1.0.2 1.1 1.2 1.3 1.4 1.5 1.6 1.7
Amount
Java Version
Growth of Java
Packages
Classes

Growth of Java Across Versions
0
275
268
129
178
123 122
103
0
236
319
121
148
120
116
106
0
50
100
150
200
250
300
350
1.0.2 1.1 1.2 1.3 1.4 1.5 1.6 1.7
PercentageGrowth
Version
Growth of Java
Package Growth
Class Growth

Language Features
“newish”

General Language Niceties

Single Static Import [1.5]
provide direct access to static variables and methods

On-Demand Static Import [1.5]

Literals [1.7]

Simplification of Strings [1.7]
Strings are constants - And - treated like
primitives (at least from a coding perspective)
But until Java 7 – weren’t supported in switch
statements
String a = “Hello”;
. . .
switch(a) {
case “hello”:
case “Hello”:
case “HELLO”
//do something
break;
default:
//do something else
break;
}

Autoboxing [1.5]

Collection Autoboxing [1.5]

Autoboxing Support
Primitive Type Reference Type
boolean java.lang.Boolean
byte java.lang.Byte
short java.lang.Short
int java.lang.Integer
long java.lang.Long
float java.lang.Float
double java.lang.Double
char java.lang.Character

For-each Loop [1.5]

Iterable For-each Loop [1.5]

Variable Method Arguments [old way]

varargs [1.5]

enums

Working with an Enum
Enums are types – provide type safety for a
closed set of values
Values are instances of an enum type
Stored as static final fields in type
Defined in terms of
name - stringified representation of field name
ordinal - position in set
Referencable through dot-notation
Are switchable

enum [1.5]

Working with an Enum [cont.]
Reference using dot notation
Enums have some predefined static methods
values – retrieves all enum instances
valueOf - transforms String value into enum instance
Have some predefined instance methods
name – upper-case name of enum instance
toString
equals
hashCode

Accessing an Enum Value

Enum Switch Example

Enum Method Example
Prints:
SUNDAY
MONDAY
TUESDAY
WEDNESDAY
THURSDAY
FRIDAY
SATURDAY

Typesafe Collections

Typesafe Collection Advantages
Adds compile time type safety to collections
Type safety simplifies collection interactions (ie:
iterating)
No advantages (or disadvantages) in speed or
performance

Simple List Example [Old way]

Simple List Example [1.5]

Simplification of Generics [1.7]
1.5 way of declaring and initializing a collection:
List<String> list = new ArrayList<String>();
Compiler should be “smart enough” to infer type
from declaration
1.7 way of declaring and initializing:
List<String> list = new ArrayList<>();

Annotations

Annotations
Metadata facility for Java
Allowing you to provide additional data alongside Java
classes
Similar to Javadoc “metadata” facility
Expanded and formalized mechanism
“Competes” with Doclet / XDoclet
Recognized by Java compiler and other tools

@Override Example [1.5]

Covariant Returns

Covariant Returns
What are they?
Allows return type of inherited method to be narrowed
Applies to method over-riding not over-loading
Why do they exist?
Needed to support generics mechanism
Removes narrowing cast on polymorphic returns
Prevents run-time ClassCastExceptions on returns
Provides compile-time type dependency checking

Covariant Return Example [1.5]

43
Auto-Closing Resources
DevelopIntelligence http://www.DevelopIntelligence.com

Simplification of try/catch [1.7]
There’s a lot of try/catch/finally boiler-plate code
out there
Why not let the compiler generate it for you?
FileInputStream fis;
try {
fis = new FileInputStream(“/tmp/myfile.txt”);
…
} catch(IOException ioe) {
…
} finally {
fis.close()
}
try (InputStream fis =new FileInputStream(“/tmp/myfile.txt”)) {
…
}
New way

Simplification of try/catch [1.7]
Do we really need all those catches?

How DevelopIntelligence Can Help?
FAST: We can provide customized on-site training within
two weeks to help with tight deadlines.
CUSTOMIZED: Complete customization of the training
you need at no additional costs to your organization.
AFFORDABLE: We have the most flexible pricing
module in the industry and can work with any budget.
CONTACT US: 877-629-5631
dave@developintelligence.com
kelby@developintelligence.com

Win a Free Safari Account
Question:
“What date did the FCS of JDK 1.0 occur”
Post your answer to:
LinkedIn:
http://www.linkedin.com/company/developintelligence
Twitter: http://twitter.com/DevIntelligence
All correct answers will be entered into a raffle –
winners will be announced Monday June 17

Whats New in Java 5, 6, & 7 (Webinar Presentation - June 2013)

Recomendados

Recomendados

Mais conteúdo relacionado

Mais procurados

Mais procurados (20)

Semelhante a Whats New in Java 5, 6, & 7 (Webinar Presentation - June 2013)

Semelhante a Whats New in Java 5, 6, & 7 (Webinar Presentation - June 2013) (20)

Último

Último (20)

Whats New in Java 5, 6, & 7 (Webinar Presentation - June 2013)

Notas do Editor