Java Questions

Enumeration is twice as fast as compared to an Iterator and uses very less memory. However, the Iterator is much safer compared to Enumeration, because other threads are not able to modify the collection object that is currently traversed by the iterator. Also, Iteratorsallow the caller to remove elements from the underlying collection, something which is not possible with Enumerations.

The Panel and Applet classes use the FlowLayout as their default layout.

You may be very good at coding,but if you questioning how on earth you could solve this problem.Then here is a solution. If you remember the good old days of our primary school then the solution is easy,"division is a matter of iterative subtraction".

public class TestEvenOdd {
public static void main(String arg[ ]){
int num=6;
int result=num;
while(result>=2){
result=result-2;
}
if(result==1){
System.out.println("The number is odd");
}else{
System.out.print("The number is even");
}
}
}

Dynamic method dispatch which is also known as runtime polymorphism is a process in which a call to an overridden method is resolved at runtime rather than at compile-time. In this process, an overridden method is called through the reference variable of a superclass. The determination of the method to be called is based on the object being referred to by the reference variable.

Function: A Function is a block of statement which perform some operation.

Declaring the function before using the function in program is known as implicit declaration of the function.

For Example::

int bar(void); // function (forward) declaration

int main(void) {

bar(); // bar was declared, the compiler has all the info

return foo(123); // foo not yet known; impl. decl. warning

}

// not previously declared function definition

int foo(int a) {

return a;

} 

// previously declared function definition

int bar() {

return 321;

}

:: is the scope resolution operator

Constructor chaining is the process of calling one constructor from another constructor with respect to current object.

Within same class: It can be done using this() keyword for constructors in same class

From base class: by using super() keyword to call constructor from the base class.