How many objects are created for a singleton class
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Answer / rajani nagandla
The Singleton is a useful Design Pattern for allowing only
one instance of your class.The Singleton's purpose is to
control object creation, limiting the number to one but
allowing the flexibility to create more objects if the
situation changes. Since there is only one Singleton
instance, any instance fields of a Singleton will occur
only once per class, just like static fields.
| Is This Answer Correct ? | 7 Yes | 1 No |
Singleton class allows to create only one instance of the
class. But the other objects can inherit from it. Singleton
is a Design Pattern to restrict create more than one
instance of a class.
And
1. It ensures only one object created for a class
2. Provides global point of access.
Mostly it is used to create DB connections.
| Is This Answer Correct ? | 4 Yes | 1 No |
Answer / utkarsh verma
Some correction required in last solution
void main(){
Single *ptr = Single::Instance(); //The only way to
//instantiate
}
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / chaman
Is a design pattern that is used to restrict instantiation
of a class to one object.
| Is This Answer Correct ? | 3 Yes | 1 No |
Answer / suresh solomon
in clustered environment singletons will have as many instances as JVMs
| Is This Answer Correct ? | 4 Yes | 2 No |
Answer / utkarsh verma
c++ program to explain Singleton
class Single {
private:
Single(){} //Can't instantiate
public:
Static Single* Obj;
Static *Single Instance ()
{
if(Obj == NULL)
Obj = new Single();
return Obj;
}
}//End of class
Single * Single ::Obj = NULL;
void main(){
Single *ptr = Obj->Instance(); //The only way to instantiate
}
| Is This Answer Correct ? | 3 Yes | 1 No |
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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)
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