To use the Scanner class in Java, import the scanner class, create an object of the class, and take user input using any function of the Scanner class.

A string is padded with zeros or spaces by using methods like leftPad or padStart using classes from external libraries like Apache Commons or Guava library

To calculate the distance between two points in Java, use the “Math.sqrt((a2-a1)*(a2-a1) + (b2-b1)*(b2-b1));” equation/formula.

In Java, the getActiveCount() method is responsible for providing the number of tasks that are currently/actively running.

The getCompletedCount() method of Java’s ThreadPoolExecutor class is used to keep track of the completed tasks within thread pools.

The mouse listener in Java responds to certain events when a user performs specific tasks through the mouse, such as clicking, entering, pressing, etc.

The for loop reads the code block a specified number of times. It creates a clean code that is easily readable, maintainable, and reusable.