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NEW QUESTION: 1
Which two properly implement a Singleton pattern?
A. class Singleton {
private static Singleton instance;
private Singleton () {}
public static synchronized Singleton getInstance() {
if (instance == null) {
instance = new Singleton ();
}
return instance;
}
}
B. class Singleton {
Singleton () {}
private static class SingletonHolder {
private static final Singleton INSTANCE = new Singleton ();
}
public static Singleton getInstance () {
return SingletonHolder.INSTANCE; } }
C. enum Singleton {
INSTANCE;
}
D. class Singleton {
private static Singleton instance = new Singleton();
protected Singleton () {}
public static Singleton getInstance () {
return instance;
}
}
Answer: A,C
Explanation:
A: Here the method for getting the reference to the SingleTon object is correct.
B: The constructor should be private
C: The constructor should be private
Note: Java has several design patterns Singleton Pattern being the most commonly used. Java Singleton pattern belongs to the family of design patterns, that govern the instantiation process. This design pattern proposes that at any time there can only be one instance of a singleton (object) created by the JVM.
The class's default constructor is made private, which prevents the direct instantiation of the object by others (Other Classes). A static modifier is applied to the instance method that returns the object as it then makes this method a class level method that can be accessed without creating an object.
OPTION A == SHOW THE LAZY initialization WITHOUT DOUBLE CHECKED LOCKING TECHNIQUE ,BUT
ITS CORRECT OPTION D == Serialzation and thraead-safety guaranteed and with couple of line of code enum Singleton pattern is best way to create Singleton in Java 5 world.
AND THERE ARE 5 WAY TO CREATE SINGLETON CLASS IN JAVA 1>>LAZY LOADING (initialization) USING SYCHRONIZATION 2>>CLASS LOADING (initialization) USING private static final Singleton instance = new
Singleton(); 3>>USING ENUM 4>>USING STATIC NESTED CLASS
5>>USING STATIC BLOCK
AND MAKE CONSTRUCTOR PRIVATE IN ALL 5 WAY.
NEW QUESTION: 2
Which of the following is atrue statement?
A. Multiple videos can be displayed through a Video iView.
B. Multiple web pages can be displayed in an Embedded URL iView.
C. Multiple applications can be searched using a Quick Search iView.
D. Multiple RSS feeds can be displayed in a RSS Feed iView.
Answer: C
NEW QUESTION: 3
The customer's administrator estimates that the time required to bring up the network is one hour; the time required to bring up recovery hosts will be two hours; and that the time required to failover storage and present to hosts is thirty minutes.
The recovery process must be done in sequence. The customer has a Recovery Time Objective (RTO) of three hours.
What is the difference between the RTO and the estimated time to recover?
Response:
A. The customer will be over their RTO by one hour.
B. The customer will be under their RTO by one hour.
C. The customer will be over their RTO by thirty minutes.
D. The customer will be under their RTO by thirty minutes.
Answer: C
NEW QUESTION: 4
Which three of the following are IBM Cúram Verification Engine components?
A. Administration
B. Participant
C. Appeals
D. Investigations
E. Case
Answer: A,B,E