Answer Posted / srinivasa

we can use to Collections.syncroniseMap() to synchronize
the HashMap

What are 4 pillers of object orinted programming?

955

---

What is methods in java?

967

---

What is object-oriented programming?

1037

---

What is default locale java?

1055

---

What is module in project?

905

---

When do we use synchronized blocks and advantages of using synchronized blocks?

1181

---

Is java still necessary?

1009

---

What is an argument java?

931

---

What class allows you to read objects directly from a stream in java programming?

1004

---

Give an example of call be reference significance.

990

---

What is void in java?

1025

---

Why java is said to be pass-by-value ?

993

---

Can a java program have 2 main methods?

1005

---

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)

2927

---

Can we create more than one object singleton class?

997

---