﻿ Java exercises: Print the area and perimeter of a rectangle - w3resource

# Java Exercises: Print the area and perimeter of a rectangle

## Java Basic: Exercise-13 with Solution

Write a Java program to print the area and perimeter of a rectangle.

Java: Perimeter of a rectangle

A perimeter is a path that surrounds a two-dimensional shape. The word comes from the Greek peri (around) and meter (measure). The perimeter can be used to calculate the length of fence required to surround a yard or garden. Following image represents the perimeter of a rectangle.

Java: Area of a rectangle

In Euclidean plane geometry, a rectangle is a quadrilateral with four right angles. To find the area of a rectangle, multiply the length by the width.
A rectangle with four sides of equal length is a square.
Following image represents the area of a rectangle.

Pictorial Presentation:

Sample Solution:

Java Code:

``````public class Exercise13 {

public static void main(String[] strings) {

final double width = 5.6;
final double height = 8.5;

double perimeter = 2*(height + width);

double area = width * height;

System.out.printf("Perimeter is 2*(%.1f + %.1f) = %.2f \n", height, width, perimeter);

System.out.printf("Area is %.1f * %.1f = %.2f \n", width, height, area);
}
}
```
```

Sample Output:

```Perimeter is 2*(8.5 + 5.6) = 28.20
Area is 5.6 * 8.5 = 47.60
```

Flowchart:

Java Code Editor:

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## Java: Tips of the Day

similarity:

Returns an array of elements that appear in both arrays.
Use Arrays.stream().filter() to remove values that are not part of second, determined using Arrays.stream().anyMatch().

```public static <T> T[] similarity(T[] first, T[] second) {
return Arrays.stream(first)
.filter(a -> Arrays.stream(second).anyMatch(b -> Objects.equals(a, b)))
// Make a new array of first's runtime type, but empty content:
.toArray(i -> (T[]) Arrays.copyOf(new Object[0], i, first.getClass()));
}
```

Ref: https://bit.ly/3CJ7huF