A program needed to read an integer, but the user entered a string instead, and an error occurred when the program was executed. What kind of error is this?

Explain the use of import statement with an example.

Distinguish between the following:

next() and nextLine()

A student was asked to write a program for computing the area of a rectangle and he, mistakenly, wrote the program to compute the perimeter of a rectangle. What kind of error is this?