Answer Posted / hitesh singh

It is true Java is not purely object-oriented programmig
language because everything is not
in an object. e.g: Java allows you to declare variables of
primitive types i.e int, float, boolean, etc. that aren't
objects. And Java has static keyword which allow user to
create static methods and variables, which are independent
and separate from objects.we cannot implement multiple
inheritance in java using classes and if we want to perform
multiple inheritance in java program so that we have to go
for inferface scenario.In java, there is only way to
implement mutiple inheritance in java.

Explain java code for recursive solution's base case?

1016

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What is mean by collections in java?

1162

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How does multithreading take place on a computer with a single cpu in java programming?

1006

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What are pass by reference and pass by value?

983

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Explain what access modifiers can be used for variables?

1050

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Can a singleton class be inherited?

965

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1.IN CASE OF DYNAMIC METHOD DISPATCH WHY WE USE REFERENCE VARIABLE,WE CAN USE THE DIFFERENT DEFINED OBJECT DIRECTLY TO ACCESS THE DATA MEMBER AND MEMBER FUNCTION OF THAT RESPECTIVE CLASS?WHAT IS THE MAIN FUNCTION OF "REFERENCE VARIABLE" HERE?

4925

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Can inner class have constructor?

1034

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Explain about wait() method?

1018

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What is meant by inheritance and what are its advantages?

1090

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what is the constructor and how many types of constructors are used in java?

993

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How many static init can you have?

1204

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What does it mean that a method or field is “static”?

969

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How many characters is 16 bytes?

988

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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)

2976

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