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B M S INSTITUTE OF TECHNOLOGY & MANAGEMENT

YELAHANKA, BENGALURU Ȃ 560064.

DEPARTMENT OF COMPUTER SCIENCE & ENGINEERING

MODULEWISE NOTES OF

Advanced Java & J2EE -15CS553

[As per Choice Based Credit System (CBCS) scheme] (Effective from the academic year 2017 -2018)

SEMESTER V

Prepared by,

Mr. Muneshwara M S

Asst. Prof, Dept. of CSE

- 560064.

VISION AND MISSION OF THE CS&E DEPARTMENT

Vision

To develop technical professionals acquainted with recent trends and technologies of computer science to serve as valuable resource

for the nation/society.

Mission:

Facilitating and exposing the students to various learning opportunities through dedicated academic teaching, guidance and

monitoring.

VISION AND MISSION OF THE INSTITUTE

Vision

To emerge as one of the finest technical institutions of higher learning, to develop engineering professionals who are technically

competent, ethical and environment friendly for betterment of the society.

Mission

Accomplish stimulating learning environment through high quality academic instruction, innovation and industry-institute interface

Modulewise Notes : Advanced Java & J2EE-17cs553

Dept. of CS&E,BMSIT&M Page 1 By. Muneshwara M S, Asst. Prof

MODULE -1

Enumerations, Autoboxing, and Annotations(Metadata)

Enumerations

Enumerations included in JDK 5. An enumeration is a list of named constants.

It is similar to final variables.

Enum in java is a data type that contains fixed set of constants. An enumeration defines a class type in Java. By making enumerations into classes, so it can have constructors, methods, and instance variables.

An enumeration is created using the enum keyword.

Ex: enum Apple { Jonathan, GoldenDel, RedDel, Winesap, Cortland } The identifiers Jonathan, GoldenDel, and so on, are called enumeration constants. Each is implicitly declared as a public, static final member of Apple. Enumeration variable can be created like other primitive variable. It does not use the new for creating object.

Ex:Apple ap;

Ap is of type Apple, the only values that it can be assigned (or can contain) are those defined by the enumeration. For example, this assigns: ap = Apple.RedDel;

Example Code-1

enum Apple { Jonathan, GoldenDel, RedDel, Winesap, Cortland } class EnumDemo public static void main(String args[])

Apple ap;

ap = Apple.RedDel;

System.out.println("Value of ap: " + ap);

// Value of ap: RedDel ap = Apple.GoldenDel; if(ap == Apple.GoldenDel)

System.out.println("ap contains GoldenDel.\n");

// ap contains GoldenDel. switch(ap) case Jonathan: System.out.println("Jonathan is red."); break; case GoldenDel: System.out.println("Golden Delicious is yellow.");// Golden Delicious is yellow break;

Modulewise Notes : Advanced Java & J2EE-17cs553

Dept. of CS&E,BMSIT&M Page 2 By. Muneshwara M S, Asst. Prof

case RedDel:System.out.println("Red Delicious is red."); break; case Winesap: System.out.println("Winesap is red."); break; case Cortland: System.out.println("Cortland is red."); break;

The values( ) and valueOf( ) Methods

All enumerations automatically contain two predefined methods: values( ) and valueOf( ).

Their general forms are shown here:

public static enum-type[ ] values( ) public static enum-type valueOf(String str) The values( ) method returns an array that contains a list of the enumeration constants. The valueOf( ) method returns the enumeration constant whose value corresponds to the string passed in str.

Example Code-2:

enum Season { WINTER, SPRING, SUMMER, FALL } class EnumExample1 public static void main(String[] args) for (Season s : Season.values())

System.out.println(s);

Season s = Season.valueOf("WINTER");

System.out.println("S contains " + s);

Example Code-3

class EnumExample5 enum Day SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDA Y,

SATURDAY

public static void main(String args[])

Day day=Day.MONDAY;

Modulewise Notes : Advanced Java & J2EE-17cs553

Dept. of CS&E,BMSIT&M Page 3 By. Muneshwara M S, Asst. Prof

switch(day) case SUNDAY: System.out.println("sunday"); break; case MONDAY: System.out.println("monday"); break; default: System.out.println("other day");

Class Type Enumeration

enum Apple Jonathan(10), GoldenDel(9), RedDel(12), Winesap(15),

Cortland(8);

private int price;quotesdbs_dbs7.pdfusesText_5

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