A constructor initializes an object during creation.
It has the same name as the class.
Constructors have no return type (not even void).
The Rectangle class in the following uses a constructor to set the dimensions:
class Rectangle {
double width;
double height;
Rectangle() {
width = 10;
height = 10;
}
double area() {
return width * height;
}
}
public class Main {
public static void main(String args[]) {
Rectangle mybox1 = new Rectangle();
double area;
area = mybox1.area();
System.out.println("Area is " + area);
}
}
When this program is run, it generates the following results:
Area is 100.0