class Hell { public static void main(String[] args) { Integer i = 42; String s = (i<40)?"life":(i>50)?"base":"ball"; System.out.println(s); } }

Correct Answer: "X extends Y" is correct if X and Y are either both classes or both interfaces

Explanation:

A is incorrect because classes implement interfaces, they don't extend them. B is incorrect because interfaces only "inherit from" other interfaces. D is incorrect based on the preceding rules.

Correct Answer: /** **/

Explanation:

• //               is a single line comment
• /*  */          is commenting on one or more lines
• /** */         is documentation comment

Correct Answer: A method declared as final can't be overridden A sub-class can't have the same method signature with a different implementation

Correct Answer: A protected method can be accessed by the classes within the same package or by the subclasses of the class in any package

Correct Answer: The variable should be declared as static and final So only one copy of the variable exists for all instances of the class and the value can't be changed also static final int PI = 214; is an example for constant

Correct Answer: NumberFormatException

Explanation:

C is correct. 'Integer.parseInt' can throw a NumberFormatException, and IllegalArgumentException is its superclass 

Correct Answer: java bean is a reusable component, where as the servlet is the java program which extends the server capability

Correct Answer: The create method in a stateless bean cannot have arguments, and can only have a single method called create() While create in Stateful bean can have arguments and could be any method starting with create string eg create(arg1, arg2, ) Although it is not compiler checked but in stateless bean the ejb Passivate() and ejb Active() methods has to be empty as these functions are never called by EJB container As conceptually in stateful session bean we might need to store the clients information hence arguments in createare necessary While in stateless bean we don't hence no arguments are necessary It's intutive isn't intutive isn't I my life I haven't seen such a futuristic server programming tool as EJB

Correct Answer: Constructors use this to refer to another constructor in the same class with a different parameter list Constructors use super to invoke the superclass's constructor If a constructor uses super, it must use it in the first line; otherwise, the compiler will complain

Correct Answer: For inserting, deleting, and locating elements in a Map, the HashMap offers the best alternative If, however, you need to traverse the keys in a sorted order, then TreeMap is your better alternative Depending upon the size of your collection, it may be faster to add elements to a HashMap, then convert the map to a TreeMap for sorted key traversal