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Parameterized constructors

class Box
    {    double width;
          double height;
          double depth;

          Box( double w, double h, double d)
          {    System.out.println("constructing box");

         double volume( )
                   return width*height*depth;
class BoxDemo
               public static void main( String args[])
               {    Box mybox1=new Box(10,20,15);
                     Box mybox2=new Box(3,6,9);
                     double vol;
                     vol=mybox1.volume( );
                     System.out.println("Volume of first box is"+vol);
                     vol=mybox2.volume( );
                     System.out.println("Volume of second box is"+vol);

In a parameterised constructor the parameters are passed while creating a object as done here:
Box mybox1=new Box(10,20,15);
The values 10,20 and 15 are passed to the constructor of class box and width, height and depth of box 1 will be initialized to these values.
Similarly we are passing values 3,6 and 9 for box 2, hence its width,height and depth are initialized to 3, 6 and 9.

hence the output of above program will be:

Volume of first box is3000
Volume of second box is162            

To know about unparameterized constructors click here

This post first appeared on Prepare For Interview And Recruitment Exams While, please read the originial post: here

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Parameterized constructors


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