Wittybrains Software Technologies Java Developer Interview Questions and Answers for Experienced

To create a thread in Java, you can extend the Thread class or implement the Runnable interface.

• Extend the Thread class and override the run() method

• Implement the Runnable interface and pass an instance to the Thread constructor

• Start the thread using the start() method

• Example: Thread thread = new Thread(() -> System.out.println("Hello World")); thread.start();

A Java program to calculate the power of a number using recursion.

• Create a recursive function that takes two parameters: the number and the power.

• If the power is 0, return 1.

• If the power is 1, return the number.

• Otherwise, recursively call the function with the number multiplied by itself and the power decreased by 1.

• Return the result.

Print prime numbers between 1-100 alternately using Java.

• Create a function to check if a number is prime or not.

• Use a loop to iterate through numbers 1-100.

• Alternate between printing prime and non-prime numbers.

• Use a boolean variable to keep track of whether the last printed number was prime or not.

A program to print prime numbers between 1-100.

• Iterate from 1 to 100

• For each number, check if it is divisible by any number from 2 to itself-1

• If not divisible by any number, it is a prime number

Overloading is having multiple methods with the same name but different parameters. Overriding is having a method in a subclass with the same name and parameters as a method in its superclass.

• Overloading is compile-time polymorphism while overriding is runtime polymorphism

• Overloading is used to provide different ways of calling a method with different parameters

• Overriding is used to provide a specific implementati...read more