Java Programming Quiz

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What is the need for object-oriented programming?

It improves the performance of the program
It reduces the need for memory management
It allows for better organization and management of code by using objects and classes (correct)
It simplifies the syntax of the programming language

How many types of constructors are used in Java?

4: static, final, public, and private constructors
3: public, private, and protected constructors
2: default and parameterized constructors (correct)
1: default constructor only

What is method overriding in Java?

It is a mechanism to access the properties of a class
It allows a subclass to provide a specific implementation of a method that is already provided by its parent class (correct)
It is a technique to define different methods with the same name but different parameters
It is a way to create multiple methods with the same name in a class

What is the difference between interface and abstract class in Java?

An interface can only have abstract methods while an abstract class can have both abstract and concrete methods (D) Signup and view all the answers

What is the difference between Heap and Stack Memory in Java?

Heap memory is used for storing objects and global variables while stack memory is used for storing method calls and local variables (A) Signup and view all the answers

Explain the various forms of inheritance with suitable code segments.

There are 5 types of inheritance in Java: single inheritance, multilevel inheritance, hierarchical inheritance, multiple inheritance (through interfaces), and hybrid inheritance (combination of any of the previous types). Example of single inheritance: <pre><code class="language-java">// Parent class class Animal { void eat() { System.out.println('eating...'); } } // Child class class Dog extends Animal { void bark() { System.out.println('barking...'); } } </code></pre> Signup and view all the answers

Explain the life cycle of a threads.

The life cycle of a thread in Java consists of five states: new, runnable, running, non-runnable (blocked), and terminated. When a thread is created but not yet started, it is in the new state. After invoking the start() method, the thread enters the runnable state where it is ready to run. When the scheduler picks the thread, it enters the running state. A thread can move to the non-runnable state due to reasons such as waiting for I/O operations or acquiring a lock. Finally, the thread enters the terminated state when it finishes its execution. Signup and view all the answers

What is an exception.

An exception in Java is an event that disrupts the normal flow of the program's instructions during execution. It is typically caused by an error or unexpected condition that occurs at runtime. Exceptions can be handled using try-catch blocks to gracefully manage errors and prevent abrupt termination of the program. Signup and view all the answers

What are the differences between C++ and Java.

Some differences between C++ and Java include: <ol> <li>C++ supports multiple inheritance, while Java supports multiple inheritance through interfaces.</li> <li>C++ uses pointers extensively, while Java uses references.</li> <li>C++ supports operator overloading, while Java does not.</li> <li>C++ requires manual memory management using new and delete, while Java has automatic garbage collection.</li> <li>C++ is platform-dependent, while Java is platform-independent due to its bytecode compilation and JVM execution.</li> </ol> Signup and view all the answers

What is threads. Describe how to create a thread with an example.

A thread in Java represents a separate path of execution within a program. Threads allow concurrent execution and can be used to perform multiple tasks simultaneously. Threads can be created by extending the Thread class or implementing the Runnable interface. Example of creating a thread using the Runnable interface: <pre><code class="language-java">public class MyThread implements Runnable { public void run() { System.out.println('MyThread is running...'); } public static void main(String[] args) { MyThread mt = new MyThread(); Thread t = new Thread(mt); t.start(); } } </code></pre> Signup and view all the answers