Question

Create an application that uses a constructor and two different methods.

JAVA

Answer 1

Java Console Application that calculates area of a square:

import java.util.Scanner;

//Class definition
class Square
{
   //Private instance variable
   private double side;
  
   //Default Constructor
   public Square()
   {
       //Set side value
       setSide(1.0);
   }
  
   //Argument Constructor
   public Square(double tSide)
   {
       //Set side value
       setSide(tSide);
   }
  
   //Set method for side
   public void setSide(double tSide)
   {
       //Set side value
       side = tSide;
   }
  
   //Get method for side
   public double getSide()
   {
       //Get side value
       return side;
   }
  
   //Computing area
   public double computeArea()
   {
       //Computing area
       return side*side;
   }
  
   //Returning string version
   public String toString()
   {
       return "Square Side: " + side + " \t Area of the Square: " + computeArea();
   }
}

//Driver class
public class SquareTest
{
   // set up GUI components and instantiate new MyRectangle
   public static void main( String args[] )
   {
       Scanner input = new Scanner( System.in );
      
       // create a new Square with no initial values
       Square square = new Square();

       System.out.print( "Please enter a double value for the side of the square: " );
       double double1 = input.nextDouble();

       square.setSide( double1 );

       System.out.println( square ); // see the results of the test

   } // end main
  
} // end class SquareTest

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Sample Run: