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NEW QUESTION: 1
:If a switch within a spanning tree domain has its spanning tree protocol disabled:
A. BPDUs from adjacent switches running spanning tree will pass through the switch.
B. BPDUs from other switches in the spanning tree domain will be blocked.
C. None of these
D. The switch will use topology change BPDUs to inform the other switches to alter the existing active topology.
Answer: A
NEW QUESTION: 2
A. Option C
B. Option A
C. Option B
D. Option D
Answer: B
NEW QUESTION: 3
Which two properly implement a Singleton pattern?
A. class Singleton {
private static Singleton instance = new Singleton();
protected Singleton () {}
public static Singleton getInstance () {
return instance;
}
}
B. enum Singleton {
INSTANCE;
}
C. class Singleton {
Singleton () {}
private static class SingletonHolder {
private static final Singleton INSTANCE = new Singleton ();
}
public static Singleton getInstance () {
return SingletonHolder.INSTANCE;
}
}
D. class Singleton {
private static Singleton instance;
private Singleton () {}
public static synchronized Singleton getInstance() {
if (instance == null) {
instance = new Singleton ();
}
return instance;
}
}
Answer: B,D
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 Singletonpattern belongs to the family of design patterns, that govern the instantiation process. This design patternproposes 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 thismethod 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 Singletonpattern 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) USINGprivate 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.
