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Java Programming Quiz

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Questions and Answers

What is Polymorphism in Java and provide a simple example?

Polymorphism in Java allows methods to do different things based on the object that it is acting upon. For example, a method draw() can behave differently when called on a Circle object compared to a Rectangle object.

Describe how you would determine if a number is a spy number in Java.

To determine if a number is a spy number, you would extract its digits, calculate both the sum and the product of those digits, and then compare the two values. If they are equal, the number is a spy number.

Explain the differences between Java and C++.

Java is a platform-independent, object-oriented programming language with automatic garbage collection, while C++ is a platform-dependent language that provides both procedural and object-oriented programming capabilities but requires manual memory management.

What are some common string functions in Java and their use cases?

<p>Common string functions in Java include <code>length()</code> to get string length, <code>charAt()</code> to access a specific character, <code>substring()</code> for sub-strings, <code>toLowerCase()</code> to convert to lowercase, and <code>indexOf()</code> to find a character's index.</p> Signup and view all the answers

How can you write a Java program to count the words and characters in a user input string?

<p>You can read the string input using a <code>Scanner</code>, then use <code>split()</code> to divide it into words for counting, and <code>length()</code> to find the number of characters in the string.</p> Signup and view all the answers

Study Notes

Java Questions

Polymorphism in Java: How is polymorphism achieved in Java? Explain with an example.
Applet Program: Write an applet program to draw any image within a circle.
AWT Program: Write an AWT program that prints a message "Hi Nidhi how are you" by clicking a button.
Spy Number: Write a Java program to enter any number, check if it's a "spy number", and explain. (A number is a spy number if the sum of its digits equals the product of its digits). Example: 1124 is a spy number.
Pattern Program: Write a Java program to print the following pattern:
- 1
- 2 3
- 4 5 6
- 7 8 9 10
- 11 12 13 14 15
Java vs C++: How does Java differ from C++?
String Functions: Explain five string functions in Java with examples.
String and Character Counter: Write a Java program to enter any string, count the words, and characters in it.

Additional Notes

Section B: Attempt any three questions. Each question is worth 15 marks.

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Description

Test your knowledge of Java programming concepts with this comprehensive quiz. Covering topics like polymorphism, applets, AWT programs, and string functions, this quiz is designed to challenge your understanding of Java. Perfect for students and enthusiasts looking to enhance their skills.