Object Oriented Programming in Java — Summer 2025

Do as directed.

We can’t extend _____ class in java. ii) _____ class is the cosmic super class of all classes in java. iii) We can’t create objects of concrete class in java.(True/False) iv) We can’t use multiple inheritance in java.(True/False)

Write the correct syntax to write 7 as octal constant in java. vi) Define Garbage collection. vii) What is the size of char data type in java?

List and explain buzzwords of java.

Explain use of static, final, this and super keywords in java.

What are constructors? Explain overloading of constructors with a suitable example.

i) Give difference between following

String and StringBuffer

== and equals() (String class) ii) What is an array? How can we use array in java? Explain for each loop to use with array.

What is an interface? How it overcomes the problem of multiple inheritances in java? Explain with example.

What is package? How can we create and import packages in java? Explain with suitable example.

What are abstract classes in java? How it can be useful? Explain with example.

Explain boxing, unboxing and auto-boxing in java.

What is an exception? How can we handle exceptions in java? Explain with a suitable example.

Explain collection framework in java. Discuss any two interfaces of collection framework.

What is a thread? What are the different ways of creating threads in java? Explain anyone with a suitable example.

What are custom exceptions? How it is useful? Explain with example.

Write a program to copy contents of one file to another. Name of both the files must be passed from command line. Implement necessary exception handling.

What is thread synchronization? Explain with a suitable example.

Explain generics in java. How can we define a generic class in java? Explain with code snippet.

What are InputStream, OutputStream, Reader and Writer class in java. Explain any one with its methods.