Answer Posted / mayur gajera

'System' is a class in java.lang package
'out' is a static object of PrintStream class in java.io
package
'prinln()' is method in the PrintStream class

Define inheritance with reference to java.

1087

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Why multiple inheritance is not supported by java?

979

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Can we change the scope of the overridden method in the subclass?

1389

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What is arguments in java?

1001

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What are accessor methods in java?

1006

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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)

2978

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What is assembly language?

981

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What is the significance of continue jump statement? Explain with an example.

1286

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What is the use of singleton class?

967

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What are the two types of java programming?

1057

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What is a newline character in java?

1034

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Can we clone singleton object in java?

1018

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How can we create a synchronized collection from given collection?

1083

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Is Constructor possible in abstract class in java ?

1062

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What does 3 dots mean in java?

983

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