Java Thread - Exercises, Practices, Solutions
Java Thread Exercises [7 exercises with solution]
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In computer science, a thread of execution is the smallest sequence of programmed instructions that can be managed independently by a scheduler, which is typically a part of the operating system. The implementation of threads and processes differs between operating systems.
A thread is a thread of execution in a program. The Java Virtual Machine allows an application to have multiple threads of execution running concurrently.
Every thread has a priority. Threads with higher priority are executed in preference to threads with lower priority. Each thread may or may not also be marked as a daemon. When code running in some thread creates a new Thread object, the new thread has its priority initially set equal to the priority of the creating thread, and is a daemon thread if and only if the creating thread is a daemon.
1. Write a Java program to create a basic Java thread that prints "Hello, World!" when executed.
2. Write a Java program that creates two threads to find and print even and odd numbers from 1 to 20.
3. Write a Java program that sorts an array of integers using multiple threads.
4. Write a Java program that performs matrix multiplication using multiple threads.
5. Write a Java program that calculates the sum of all prime numbers up to a given limit using multiple threads.
6. Write a Java program to implement a concurrent web crawler that crawls multiple websites simultaneously using threads.
7. Write a Java program that creates a bank account with concurrent deposits and withdrawals using threads.
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Java: Tips of the Day
IsPowerOfTwo
Checks if a value is positive power of two.
To understand how it works let's assume we made a call IsPowerOfTwo(4).
As value is greater than 0, so right side of the && operator will be evaluated.
The result of (~value + 1) is equal to value itself. ~100 + 001 => 011 + 001 => 100. This is equal to value.
The result of (value & value) is value. 100 & 100 => 100.
This will value the expression to true as value is equal to value.
public static boolean isPowerOfTwo(final int value) {
return value > 0 && ((value & (~value + 1)) == value);
}
Ref: https://bit.ly/3sA5d4I
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