Anees Asghar

To check if a string is Null, you can use Java’s relational operator “==” or the “Objects.isNull()” method. Both these approaches return a Boolean value.

To flatten a list of lists in Java, you can use methods like flatMap(), forEach(), reduce(), collect(), forEach loop, Guava Library, or Eclipse Collection.

To call a non-static method from another class, first, create the class instance in the other class, then call it depending upon its access modifier.

To add days to a date in Java, use the built-in classes like Calendar, LocalDate, Instant, or the DateUtils class of the Apache Commons Library.

A list containing some other lists as its elements is known as a List of Lists. To create a list of lists in Java, use Arrays.asList(), add(), or Stream.of().

In Java, the pop() method pops and removes a single element at a time and that element is always the topmost element of the stack.

In Java, the “finally” block executes regardless of the exceptions. In the “finally” block, you can specify the code that you want to execute always.

In Java, class attributes are variables contained by a specific class. They represent the characteristics of a class and are also known as fields.