class Box
{ double width;
double height;
double depth;
Box( double w, double h, double d)
{ System.out.println("constructing box");
width=w;
height=h;
depth=d;
}
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
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