![]() The resulting main() would be just a menu. For example, if you were to add support for parallelograms and trapezoids, you might have a conflict for a variable named height, if you lumped everything into main(). I recommend splitting each calculation into a separate function, to ensure that they do not interfere with each other. I don't see any reason why the inputs should be restricted to ints. Should you later decide to add validation and error handling, you can implement it in one central place. It is called when an instance of the class is created. ![]() constructor is a block of codes similar to the method. Constructor is use to initialize the value for object attributes. a Scanner object using a constructor // which takes the System.in object. In this program we use constructor to find the area of rectangle. Program to demonstrate how to Calculate Area and Perimeter of Rectangle in. Since there are so many places where you write () followed by scanner.nextInt(), it makes sense to write a function for that. Example 2: Java Program to Find Area of Rectangle Using Constructor. Not only is it easier to see the patten at a glance, it is also more efficient, in that it compiles to a single tableswitch opcode. The compiler will embed just one long string constant in the bytecode.)Ī chain of if-elses would be better written using a switch block. "Enter 3 to find the area of a Triangle or " + "Enter 2 to find the area of a Square, " + "Enter 1 to find the area of a Rectangle, " + Instead of writing the menu as a very long string, it would be more manageable to split it: ("Welcome to the Area Calculator! " + You would be better off naming the class AreaCalculator, which would be more meaningful than Main. Making a package for a one-class program seems like overkill. Int radius = Integer.parseInt(scanner.next()) ("Please enter the radius of the circle: ") Int triangleHeight = Integer.parseInt(scanner.next()) ("Please enter the height of the triangle: ") Int triangleBase = Integer.parseInt(scanner.next()) ("Please enter the base of the triangle: ") Int lengthOfASide = Integer.parseInt(scanner.next()) Int width = Integer.parseInt(scanner.next()) ![]() ("Please enter the width of the rectangle: ") Int length = Integer.parseInt(scanner.next()) ("Please enter the length of the rectangle: ") Int userInput = Integer.parseInt(scanner.next()) Now this length and width of a rectangle values are stored in two variables length and width of data type double. ("Welcome to the Area Calculator! Enter 1 to find the area of a Rectangle, Enter 2 to find the area of a Square, Enter 3 to find the area of a Triangle or Enter 4 to find the area of a Circle") To calculate area of rectangle first user enters the length and width of a rectangle using nextDouble () method of Scanner class. Enter the length of Rectangle: 2 Enter the width of Rectangle: 8 Area of Rectangle is:16.0 Program 2: class AreaOfRectangle2. How to write a java program to calculate the total surface area of a cylinder Well That’s quite simple here we share in three different ways to write Java code for the total surface area of a cylinder. Scanner scanner = new Scanner(System.in) Get length and breadth of a rectangle (using scanner class) Calculate area by. What this does is that it prompts the user to select a shape, and asks for the details needed to calculate the area of that specific shape. Using this example you will learn Java Program to find area of Rectangle. ![]() Import is a simple Area Calculator coded in Java. There are maybe so many methods in order to write the java program to find the area of a rectangle. Also, this program finds the volume of a cube. Java program to calculate the area of a rectangle. Here is a Java program that finds the area, perimeter, and diagonal of a rectangle. ![]()
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