Answer Posted / srikanth

Data abstraction is one part of the data
encapsulation....that means data hiding...by achieving data
abstraction by
1)group of similar variables and methods is called
class...so one class variables and methods are hide to
another....
2)by using access specifiers

Do you know why doesn't the java library use a randomized version of quicksort?

955

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What is the difference between JDK and JVM?

1272

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Explain the difference between runnable and callable interface in java?

1056

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Why Set interface contains unique elements, what internally implemented for this so that it contains unique elements?

8114

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Enlist diffrent types of inheritance supported by java?

918

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what is aggregation in java?

1021

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Does constructor return any value?

1032

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What are the types of relation?

1046

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Can we use both this () and super () in a constructor?

1006

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How do you remove duplicates in java?

1025

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how a programmer confirms that the data submitted has been succesfully inserted into the database(either oracle or my sql).. How a programmer confirm if there is any problem with the program he wrote for insertion... ANS:--- >executeupdate method is having boolean return type, if anything goes wrong in data insertion or data updation, it would return false. otherwise, if it successfully inserts data into the database, it would return true NOW HOW TO I CHECK IN MY DURING EXECUTION WHETHER IT RETURNS TRUE OR FALSE... WELL IT WILL DISPLAY ANY MESSAGE OR NOT

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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)

2982

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Can we assign integer value to char in java?

1034

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Explain features of interfaces in java?

994

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How is tree Mirroring implemented?

1081

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