I Have a class abstract with one abstract method, so that
method should override in the subclass, but i dont want to
override, if i am not override what will happen? If
compilation will occur then i dont want to give compilation
error, then what we need to do???
See the sample program.
public abstract class AbstractExample {
public abstract void sampleMethod();
}
public class AbstractExampleImple extends AbstractExample {
}
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Answer / kvsravindrareddy
Normally abstract method should implement in the subclass,
otherwise application will give compilation error. If you want
to without compilation error, then subclass also make as a
abstract class, application will not give any compilation
error.
See the below sample code.
public abstract class AbstractExample {
public abstract void sampleMethod();
}
public abstract class AbstractExampleImple extends
AbstractExample {
}
| Is This Answer Correct ? | 20 Yes | 0 No |
Answer / shreya tanavade
if you dont want to override the abstract method i.e. SampleMethod ,then you must declare the subclass as ABSTRACT..i.e.declare....public declare class AbstractExampleImple ...otherwise it wuld throw compilation error
| Is This Answer Correct ? | 1 Yes | 0 No |
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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