Object Oriented Programming -I — Summer 2023

What is the Java bytecode, and what is the extension of Java bytecode file? Which software is needed to run Java bytecode?

Describe syntax errors (compile errors), runtime errors, and logic errors by giving suitable examples?

Answer in brief (within 50 words): I. Justify Java enables high performance. II. Differentiate between while and do while loop? III. How many times is the println statement executed? for (int i = 0; i < 10; i++) for (int j = 0; j < i; j++) System.out.println(i * j); IV. If the value of variable x is 1 then what will be returned by the following expression: x % 2 = = 0

What is the use of this keyword? How it is different from super keyword?

(i) Given that Thing is a class, how many objects and how many reference variables are created by the following code? Thing item, stuff; item = new Thing(); Thing entity = new Thing(); (ii) Examine following code. Write and justify output. public class MyClass { public static void main(String[] args) { Cc = new C(); System.out.println(c.max(12, 29)); } } class A { int max(int x, int y) { if (x>y) return x; else return y; } } class Bextends A{ int max(int x, int y) { return super.max(y, x) - 10; } } class Cextends B { int max(int x, int y) { return super.max(x+10, y+2); } }

Write a program that defines class named StopWatch. The class contains: • Private data fields startTime and endTime with getter methods.1 • no-arg constructor that initializes startTime with the current time. • Amethod named start() that resets the startTime to the current time. • Amethod named stop() that sets the endTime to the current time. • Amethod named getElapsedTime() that returns the elapsed time for the stopwatch in milliseconds. • Declare object of StopWatch to demonstrate stop watch. Hint: Use System.currentTimeMillis() to get current time in milliseconds.

Create a class called Employee that includes: I. Three instance variables— id (type String), name (type String) and monthly_salary (double). II. Adefault constructor that initializes the three instance variables. III. Asetter and a getter method for each instance variable (for example for id variable void setId(String id), String getId( )). IV. displayEmployee() method for displaying employee details. Write a driver class named EmployeeTest that demonstrates class Employee’s capabilities. Create two Employee objects and display each object’s yearly salary. Then give each Employee a 10% raise and display each Employee’s yearly salary again.

Differentiate between checked and unchecked exception?

Exemplify throw and throws clause of exception handling?

Demonstrate use of try catch block by catching ArithmeticExceptions and InputMismatchExceptions?

Describe thread life cycle with block diagram?

Differentiate between Thread class and Runnable interface for implementing Threads?

Write a program to make calculator that accepts input from commandline? Use java’s exception handling mechanism to handle abnormal situation?

Define Queue interface of java collection classes?

Explain types of polymorphism?

What are the differences between ArrayList and LinkedList? Demonstrates use of ArrayList with example?

Define Object Serialization?

What are the differences between text I/Oand binary I/O?

Describe and demonstrate Binary I/Oclasses of java?

Answer in one line:

Write the name of package in which all collection classes and interface are grouped. (ii) Write the name of collection interface or abstract class which store and process object in a first-in, first-out fashion. (iii) Write the name of method that checks whether the collection contains the specified element.

List JavaFX UI controls?

What do you understand by event source and event object? Explain how to register an event handler object and how to implement a handler interface?

Enlist various Layout panes available in JavaFX?

Discuss JavaFX benefits?

Illustrate basic structure of JavaFX program?