class Test {

public static void main(String args[]) {

A a = new A();

a.print();

}

}

class A {

String s;

A(String s) {

this.s=s;

}

public void print() {

System.out.println(s);

}

}

denote the fan speed.

– An int data field named speed that specifies the speed of the fan (default

SLOW).

– A boolean data field named f_on that specifies whether the fan is on(default

false).

– A double data field named radius that specifies the radius of the fan (default

4).

– A data field named color that specifies the colorof the fan (default blue).

– A no-arg constructor that creates a default fan.

– A parameterized constructor initializes the fan objects to given values.

– A method named display() will display descriptionfor the fan. If the fan is on, the display() method displays speed, color and radius. If the fan is not on, the method returns fan color and radius along with the message “fan is off”. Write a test program that creates two Fan objects. One with default values and the other with medium speed, radius 6, color brown,and turned on status true. Display the descriptions for two created Fan objects.

width and height , A no-arg constructor that creates the default rectangle with (0,0) for (x,y) and 1 for both width and height. A parameterized constructor creates a rectangle with the specified x,y,height and width.

A method getArea() that returns the area of the rectangle.

A method getPerimeter() that returns the perimeter of the rectangle.

A method contains(double x, double y) that returns true if the specified point

(x,y) is inside this rectangle.

Write a test program that creates two rectangle objects. One with default values

and other with user specified values. Test all the methods of the class for both

the objects.

public static void main(String args[]) {

Count myCount = new Count();

int times=0;

for(int i=0;i<100;i++)

increment(myCount,times);

System.out.println(“count is “+myCount.count);

System.out.println(“times is “+times);

}

public static void increment(Count c,int times) {

c.count++;

times++;

}

}

class Count {

public int count;

Count(int c){ count=c; }

Count(){ count=1; }

}

(ii) this, super, final

(ii) When invoking a constructor from a subclass, its super class’s no-arg

constructor is always invoked.

(iii) A protected data or method can be accessed by any class in the same

package.

(iv) A method can change the length of an array passed as a parameter.

hierarchy. Declare one instance variable of type String that indicates the color of

a vegetable. Create and display instances of these objects. Override the

toString() method of Object to return a string withthe name of the vegetable

and its color.

hierarchy. Declare one instance variable of type String that indicates the color of

a vegetable. Create and display instances of these objects. Override the

toString() method of Object to return a string withthe name of the vegetable

and its color.

The Transport interface declares a deliver () method. The abstract class Animal is the super class of the Tiger, Camel, Deer and Donkey classes. The Transport interface is implemented by the Camel and Donkey classes. Write a test program that initialize an array of four Animal objects. If the object implements the Transport interface, the deliver () method is invoked.

interface is implemented by the Camel and Donkey classes. Write a test

program that initialize an array of four Animal objects. If the object implements

the Transport interface, the deliver() method is invoked.

(ii) Constructor and method

(iii) Text I/O and Binary I/O

public static void main(String args[]) {

try {

System.out.println(“calling method a”);

a();

System.out.println(“return from method a”);

} catch(ArithmeticException e) {

System.out.println(“main: catch”);

} finally {

System.out.println(“main: finally”);

}

}

public static void a() {

try {

int x=8,y=0;

int z=x/y;

System.out.println(“value of z=”+z);

} catch(NumberFormatException e) {

System.out.println(“method a:catch”);

} finally {

System.out.println(“method a:finally”);

} }}

What is  the use following java keywords           
super, transient, finally, final, static, throw, throws 

– Create m number of threads

– Each thread computes summation of elements of one row, i.e. i throw of the matrix is processed by i th thread. Where 0 <= i < m.

– Print the results.

What is multithreading? Why it is required? Write a program that creates three threads. Make sure that the main thread executes last.

size of Vector each time additional capacity is needed.

and concrete classes of collection hierarchy.

i) What is collection in Java?  Differentiate between Vector and ArrayList        
ii)  Explain the unique features of Map interface.

(a) i) What do you mean by Event Delegation model in Java?          ii) How the concept of inner classes is used for event handling?