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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 {
private static Singleton instance = new Singleton();
protected Singleton () {}
public static Singleton getInstance () {
return instance;
}
}
C. class Singleton {
Singleton () {}
private static class SingletonHolder {
private static final Singleton INSTANCE = new Singleton ();
}
public static Singleton getInstance () {
return SingletonHolder.INSTANCE;
}
}
D. enum Singleton {
INSTANCE;
}
Answer: A,D
Explanation:
Explanation/Reference:
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
The following query is executed frequently against the SALES table:
SELECT sales_id, sales_date, sales_person FROM sales;
If data in the SALES_ID column is unique,
Which statement will create an index for optimal query performance and ensure uniqueness of the SALES_ID column?
A. CREATE UNIQUE INDEX sales_idx ON sales (sales_id) INCLUDE (sales_date, sales_person)
B. CREATE INDEX sales_idx ON sales (sales_id, sales_date, sales_person)
C. CREATE UNIQUE INDEX sales_idx ON sales (sales_id, sales_date, sales_person)
D. CREATE INDEX sales_idx ON sales (sales_id) INCLUDE (sales_date, sales_person)
Answer: A
NEW QUESTION: 3
You want to establish a VPN, using certificates. Your VPN will exchange certificates with an external partner. Which of the following activities should you do first?
A. Create a new logical-server object to represent your partner's CA.
B. Manually import your partner's Access Control List.
C. Manually import your partner's Certificate Revocation List.
D. Exchange exported CA keys and use them to create a new server object to represent your partner's Certificate Authority (CA).
Answer: D