Talha Malik

To create a circle in Java there are various functions available. These are the fillOval() function, the drawRoundRect() function, and the draw() function

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.

Generic graphs can be implemented with generic classes and HashMaps. They can store data of different types, such as int, string, custom objects, etc.

Optional.ofNullable() Method in Java is used for the implementation of both null and not null values. The optional.empty() method appears for the null values

To implement a callback function in Java, the approach involves creating a function as a first-class entity, which is then invoked from a second class.

The covariant return type in Java deals with non-primitive data types like arrays, lists, and classes. It makes the code look cleaner and more usable.