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

Flashcards

Polymorphism in Java

The ability of an object to take on many forms. Methods with the same name can behave differently depending on the object they are called upon.

Java Applet Image in Circle

A Java program that displays a graphic image inside a circle using Java's AWT or Swing libraries.

Spy Number in Java

A number where the sum of its digits equals the product of its digits.

Java Pattern Printing Program

A Java program to display a specific numerical pattern in a triangular formation, progressively increasing elements per row.

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Java vs. C++

A comparison of two popular programming languages highlighting their core differences and strengths, focusing on language type, paradigm, and other key attributes.

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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.