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NEW QUESTION: 1
Which two properly implement a Singleton pattern?
A. enum Singleton {
INSTANCE;
}
B. class Singleton {
Singleton () {}
private static class SingletonHolder {
private static final Singleton INSTANCE = new Singleton ();
}
public static Singleton getInstance () {
return SingletonHolder.INSTANCE;
}
}
C. class Singleton {
private static Singleton instance = new Singleton();
protected Singleton () {}
public static Singleton getInstance () {
return instance;
}
}
D. class Singleton {
private static Singleton instance;
private Singleton () {}
public static synchronized Singleton getInstance() {
if (instance == null) {
instance = new Singleton ();
}
return instance;
}
}
Answer: A,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.
NEW QUESTION: 2
展示を参照してください。
HostAはHostBにpingできません。 ルーティングが適切に設定されていると仮定すると、この問題の原因は何ですか？
A. RouterAのFa0 / 0インターフェイスは、使用できないサブネット上にあります。
B. ルータのシリアルインターフェイスが同じサブネット上にありません。
C. ルータBのFa0 / 0インターフェイスがブロードキャストアドレスを使用しています。
D. HostAはデフォルトゲートウェイと同じサブネット上にありません。
E. SwitchAのアドレスはサブネットアドレスです。
Answer: B
Explanation:
Now let's find out the range of the networks on serial link:
For the network 192.168.1.62/27:
Increment: 32
Network address: 192.168.1.32
Broadcast address: 192.168.1.63
For the network 192.168.1.65/27:
Increment: 32
Network address: 192.168.1.64
Broadcast address: 192.168.1.95
-> These two IP addresses don't belong to the same network and they can't see each other.
NEW QUESTION: 3
A server contains baseline images that are deployed to sensitive workstations on a regular basis. The images are evaluated once per month for patching and other fixes, but do not change otherwise. Which of the following controls should be put in place to secure the file server and ensure the images are not changed?
A. Require the use of two-factor authentication for any administrator or user who needs to connect to the server.
B. Install and configure a file integrity monitoring tool on the server and allow updates to the images each month.
C. Install a honeypot to identify any attacks before the baseline images can be compromised.
D. Schedule vulnerability scans of the server at least once per month before the images are updated.
Answer: B
NEW QUESTION: 4
A company prepares a flexible budget each month for manufacturing costs. Formulas have been developed for all costs within a relevant range of 5,000 to 15,000 units per month. The budget for electricity a semi variable cost) is US $19,800 at 9.000 units per month, and US $21,000 at 10,000 units per month. How much should be budgeted for electricity for the coming month if 12,000 units are to be produced?
A. US $25,200
B. US $22,200
C. US $23,400
D. US $26,400
Answer: C
Explanation:
A flexible budget consists of a fixed cost component and a variable cost component. The fixed cost component can be expected to remain constant throughout the budgets relevant range. The variable cost component, however will change at a constant rate within the budget's range. The increase in budgeted cost of US $1,200 $2'1.000 $19,800) per 1,000 units of production can therefore be calculated as the variable cost per unit of U'. $: 1i. r [$21.000 $19,800) 1.000] and the total fixed costs of US $9,000 [$21,000 - 10.000 $1_201]
These cost can then be used to determine the total cost of using 12,000 units of electricity
[US $9,000 FC + 12,000 x $1.20)].