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## What is parameter in Java?

A parameter is **a value that you can pass to a method in Java**. Then the method can use the parameter as though it were a local variable initialized with the value of the variable passed to it by the calling method.

## What is scanner in Java?

The Java Scanner class is **used to collect user input**. Scanner is part of the java. util package, so it can be imported without downloading any external libraries. Scanner reads text from standard input and returns it to a program.

## How do you compare two numbers in Java?

To compare integer values in Java, we can use either **the equals() method or == (equals operator)**. Both are used to compare two values, but the == operator checks reference equality of two integer objects, whereas the equal() method checks the integer values only (primitive and non-primitive).

## How do you get the perimeter of a circle?

Learn that the perimeter of a circle has its own special name, called “circumference.” The symbol is a capital C. It is calculated using the formula Pi x diameter, or **3.14 x d = C**. It can also be calculated by Pi x (2 x radius) = C or 3.14 x (2 x r) = C.

## What is area formula?

The most basic area formula is the formula for the area of a rectangle. Given a rectangle with length l and width w, the formula for the area is: **A = lw (rectangle)**. … As a special case, as l = w in the case of a square, the area of a square with side length s is given by the formula: A = s^{2} (square).

## How do you find the area of a circle with the diameter?

The formula for the area A as a function of the diameter d of a circle is given by A **= π (d/2)^2.**