7. Complete the following: a. Create a package named shape. b. Create some classes in the package representing some common shapes like Square, Triangle, and Circle. c. Import and compile these classes in other program.

/*Mainclass.java*/
import shape.Square;
import shape.Triangle;
import shape.Circle;
public class MainClass
{
public static void main(String args[])
{
Square square=new Square();
Triangle triangle=new Triangle();
Circle circle=new Circle();
square.getData((float)5.5);
System.out.println("The area of square is:"+square.area());
triangle.getData((double)20.56,(double)23.90);
System.out.println("The area of triangle is:"+triangle.area());
circle.getData((double)5.5);
System.out.println("The area of circle is:"+circle.area());
}
}

/*Square.java*/
package shape;
public class Square
{
float side;
public void getData(float temp)
{
side=temp;
}
public double area()
{
return (side*side);
}
}


/*Triangle.java*/
package shape;
public class Triangle
{
double base;
double height;
public void getData(double temp1,double temp2)
{
base=temp1;
height=temp2;
}
public double area()
{
return ((1.0/2.0)*(base*height));
}
}


/*Circle.java*/
package shape;
public class Circle
{
double radius;
double height;
public void getData(double temp)
{
radius=temp;
}
public double area()
{
return ((3.1427*(2.0*radius)*(2.0*radius))/4.00);
}
}