BITM Object Oriented Programming in Java

What will convert Java code to byte code?

“Java is architecture-neutral language”. Does this statement conflict with JVM? Give your opinion.

What is the significance of bytecode?

What is the task of scanner class?

How does for each different with for loop?

Define type casting.

Can you convert float to integer implicitly?

How do you handle big numbers? Illustrate with an example.

Write a Java program to find the value of \(a^b\) for given a and b.

Write a Java program that declares and initializes an integer array of size 15 and display only the perfect square integer.

Can you imagine Java Program without this pointer? What is the role of this super keyword? Write a program to create following types of multidimensional array and print the values as follows.

Write a program to find the second largest integer from an array.

Write a Java program to display whether a character is an alphabet or not.

Write a program to create a class student with data member roll and name. Sort the 10 objects of this class on the basis of name.

Define package.

What is the name of class that is base class for all implicit and explicit classes?

When do you use inner class?

What is the role of static field?

Do we need to define default constructor all the time? Justify.

Why main() is declared as static?

Define encapsulation.

Write syntax for defining a package in Java.

Define method overloading.

What is the role of this keyword?

Define and mention the use of final data member, final method and final class.

Write an example program of inner class.

Create a class named Book with instance variables title and price. Add a method named setVar to pass parameters for title and price. Add another method named showVar to display values of these variables. Now in main (), declare 4 objects of book and display the records of book that starts with "Java".

Create a class named college with instance variables cname and crank. Add a method named setCollege with parameters name and rank. Add another method named showRecord to display values of these variables. Now derive a class named student with member variables name and roll. Also add two methods setStudent and displayRecord to set parameters and to display records respectively in student. Now in main (), declare 4 objects of student and display the records of student whose name ends with “ra”.

Differentiate between concrete class and abstract class. Why the process of implementing multiple inheritance using concrete classes is prohibited in Java and how it can be solved using interface? Explain.

Differentiate between super class and sub class.

Create an interface Exam with methods setExam(String division, int mark) and showExam(). Create a class named test that implements the interface Exam and then display the records.

Define Inheritance. List different types of inheritance. Explain the chain of constructor and destructor between sub class and super class.

Differentiate between error and exception.

Write a program to create your own exception as invalid string such that when the string given by user is of odd length.

Differentiate between Checked and Unchecked exception.

Define Exception. Why should we handled an Exception? Write a Java program to create a class Mobile (type, Phone_no). Customize the exception such that if the user give phone_no having less than or greater than 10 digit, then the program has to throw an exception with the message "Invalid Phone number".

What is generic programming?

Write a Java program to display the sum of 5 numbers using generic method.

Why do we need wrapper class? Illustrate with an example.

Write an importance of generic class.

Why do we need wrapper classes? Explain.

Write an example program that contains a generic class.

Write a program to read an integer and if the integer is positive write it to the file “pos.dat” otherwise “neg.dat”.

Create a class name Movie (id, genre). Write the object of Movie class into file named "Comedy.dat" having comedy as genre.