Answer Posted / sridhar

Inheriting will inherits the constructor as well.

// This program uses inheritance to extend Box.
class Box {
double width;
double height;
double depth;
// construct clone of an object
Box(Box ob) { // pass object to constructor
width = ob.width;
height = ob.height;
depth = ob.depth;
}
// constructor used when all dimensions specified
Box(double w, double h, double d) {
width = w;
height = h;
depth = d;
}
// constructor used when no dimensions specified
Box() {
width = -1; // use -1 to indicate
height = -1; // an uninitialized
depth = -1; // box
}
// constructor used when cube is created
Box(double len) {
width = height = depth = len;
}
// compute and return volume
double volume() {
return width * height * depth;
}
}
// Here, Box is extended to include weight.
class BoxWeight extends Box {
double weight; // weight of box
// constructor for BoxWeight
BoxWeight(double w, double h, double d, double m) {
width = w;
height = h;
depth = d;
weight = m;
}
}
class DemoBoxWeight {
public static void main(String args[]) {
BoxWeight mybox1 = new BoxWeight(10, 20, 15, 34.3);
BoxWeight mybox2 = new BoxWeight(2, 3, 4, 0.076);
double vol;
vol = mybox1.volume();
System.out.println("Volume of mybox1 is " + vol);
System.out.println("Weight of mybox1 is " + mybox1.weight);
System.out.println();
vol = mybox2.volume();
System.out.println("Volume of mybox2 is " + vol);
System.out.println("Weight of mybox2 is " + mybox2.weight);
}
}

The output from this program is shown here:
Volume of mybox1 is 3000.0
Weight of mybox1 is 34.3
Volume of mybox2 is 24.0
Weight of mybox2 is 0.076

BoxWeight inherits all of the characteristics of Box and
adds to them the weight
component. It is not necessary for BoxWeight to re-create
all of the features found in
Box. It can simply extend Box to meet its own purposes

make a method which any number and any type of argument and print sum of that arguments.....

1367

---

How the interruptible method gets implemented?

548

---

What occurs when an object is constructed?

557

---

How do you escape in java?

570

---

What is the integer of 16?

531

---

---

What is java string pool?

532

---

Why spring singleton is not thread safe?

557

---

What is the purpose of final keyword and when to use it?

516

---

What is the numeric promotion?

488

---

What is thread start?

510

---

Q1.A. Write note on “The class path Environment Variable”? B. Which are different kinds of source code? Q2.A. How to create an interface? B. Why convert an applet to an application? Q3.A. How to use Media tracker Class. B. How to use string tokenizer class. Q4 A. Explain the overview of UDP messaging. B. Difference between SQL Exception class and SQL Warning class. Q5. A. How to create com object in Java? B. Write short notes on “The properties class” Q6. A. When object is created and destroyed? B. Explain the JDB in depth & command line. C. Write short notes on Web Sites.

7403

---

In a container there are 5 components. I want to display the all the components names, how will you do that one?

596

---

Can we start a thread twice in java?

504

---

What is the difference between interface & abstract class?

551

---

What is a subsequence of a string?

535

---