Answer Posted / shakti prasad rath

System ->it is a final class present in java.lang package
that can be inherited.

out -> it is a inner class object.

println() -> it is a method in printstream class

Explain importance of throws keyword in java?

570

---

What is the need of transient variables in Java ?

583

---

3.2 Consider the following class: public class Point { protected int x, y; public Point(int xx, int yy) { x = xx; y = yy; } public Point() { this(0, 0); } public int getx() { return x; } public int gety() { return y; } public String toString() { return "("+x+", "+y+")"; } } Say you wanted to define a rectangle class that stored its top left corner and its height and width as fields. 3.2.1 Why would it be wrong to make Rectangle inherit from Point (where in fact it would inherit the x and y coordinates for its top left corner and you could just add the height and width as additional fields)? (1) 8 Now consider the following skeleton of the Rectangle class: public class Rectangle { private Point topLeft; private int height, width; public Rectangle(Point tl, int h, int w) { topLeft = tl; height = h; width = w; } public Rectangle() { this(new Point(), 0, 0); } // methods come here } 3.2.2 Explain the no-argument constructor of the Rectangle class given above. 3.2.3 Write methods for the Rectangle class to do the following: • a toString() method that returns a string of the format "top left = (x, y); height = h; width = w " where x, y, h and w are the appropriate integer values. • an above() method that tests whether one rectangle is completely above another (i.e. all y values of the one rectangle are greater than all y values of the other). For example, with the following declarations Rectangle r1 = new Rectangle(); Rectangle r2 = new Rectangle(new Point(2,2), 1, 4); the expression r2.above(r1) should give true, and r2.above (r2) should give false. (You can assume that the height of a rectangle is never negative.) (2) (5)

2438

---

Can we write any code after throw statement?

615

---

How many classes can any class inherit java?

512

---

---

What is your platform’s default character encoding?

562

---

What is the use of object and class classes?

571

---

What is an argument java?

541

---

what is thread? What are the high-level thread states? : Java thread

794

---

What is reverse function?

582

---

What is a get method?

539

---

Outline the major features of java.

571

---

Explain creating threads by implementing runnable class?

593

---

How can you generate random numbers in java?

592

---

Is char a data type in java?

548

---