List and explain various features of java.

Explain the words super, static, and final using examples

Provide the output of the following program for the values of y=0 and y=2:

public class Test {

public static void main(String args[]) {

try {

System.out.println("calling method a");

a(); System.out.println("return from method a");

} catch(ArithmeticException e) {

System.out.println("main: catch");

} finally {

System.out.println("main: finally");

} } public static void a() {

try {

int x=8,y=0;

int z=x/y;

System.out.println("value of z="+z);

} catch(NumberFormatException e) {

System.out.println("method a:catch");

} finally

{ System.out.println("method a:finally");

} }}

Explain both overloading and overriding, and provide an example for each.

Declare a class called employee having employee_id and employee_name as members.

Extend class employee to have a subclass called salary having designation and monthly) salary as members.

Define the following:

1. Required constructor.
2. A method to find and display all details of employees drawing a salary more than 20,000/-.
3. Method main for creating an array for storing these details given as command line arguments and showing usage methods.

Describe abstract class called Shape. This class has three subclasses called: Triangle, Rectangle and Circle. Define one method area () in the abstract class and override this area() in these three subclasses to calculate the area for specific class' object.

Declare a class called coordinate. This is to represent 3 dimensional Cartesian coordinates (x, y and z). Define the following methods:

1. Constructor
2. Display, to print values of members
3. Add_coordinates, to add three such coordinate objects to produce a resultant coordinate object. Generate and handle exceptions if x, y and z coordinate of the result are zero.
4. Main, to show use of the above methods.

Write a java application that has three Buttons labeled: Red, Green, and Blue. The java application should have the following:

When clicking on the background, the color should change accordingly and have a label displaying the color selected.

Write an application that creates and starts three threads.

Each thread is instantiated from the same class.

It executes a loop with 10 iterations.

1. Each iteration displays the string "HELLO"
2. Sleeps for 300 milliseconds.
3. The application waits for all the threads to complete & displays the message "Good Bye...".

Draw a use case diagram for a Library Management System.

Answer the following:

1. Collection in JAVA.
2. Features of Map Interface.