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NEW QUESTION: 1
Which two properly implement a Singleton pattern?
A. class Singleton {
Singleton () {}
private static class SingletonHolder {
private static final Singleton INSTANCE = new Singleton ();
}
public static Singleton getInstance () {
return SingletonHolder.INSTANCE;
}
}
B. class Singleton {
private static Singleton instance;
private Singleton () {}
public static synchronized Singleton getInstance() {
if (instance == null) {
instance = new Singleton ();
}
return instance;
}
}
C. enum Singleton {
INSTANCE;
}
D. class Singleton {
private static Singleton instance = new Singleton();
protected Singleton () {}
public static Singleton getInstance () {
return instance;
}
}
Answer: B,C
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
Which two statements are true about the rules of precedence for operators? (Choose two.)
A. NULLS influence the precedence of operators in an expression
B. The concatenation operator | | is always evaluated before addition and subtraction in an expression
C. Multiple parentheses can be used to override the default precedence of operators in an expression
D. Arithmetic operators with equal precedence are evaluated from left to right within an expression
E. The + binary operator has the highest precedence in an expression in a SQL statement
Answer: C,D
Explanation:
Reference:
https://docs.oracle.com/cd/B19306_01/server.102/b14200/operators001.htm
https://docs.oracle.com/cd/A87860_01/doc/server.817/a85397/operator.htm Precedence is the order in which Oracle evaluates different operators in the same expression. When evaluating an expression containing multiple operators, Oracle evaluates operators with higher precedence before evaluating those with lower precedence. Oracle evaluates operators with equal precedence from left to right within an expression.
NEW QUESTION: 3
참 또는 거짓 : CloudFormation 템플릿에서 동일한 논리 ID를 여러 번 재사용하여 템플릿의 다른 부분에 있는 리소스를 참조 할 수 있습니다.
A. 거짓이면 리소스를 한 번만 언급 할 수 있으며 템플릿의 다른 부분에서 리소스를 참조 할 수 없습니다.
B. 논리 ID를 여러 번 사용하여 템플릿의 다른 부분에있는 리소스를 참조 할 수 있습니다.
C. 거짓, 템플릿의 다른 부분을 참조 할 수 없습니다.
D. 거짓, 논리적 ID는 템플릿 내에서 고유해야 합니다.
Answer: D
Explanation:
설명
AWS CloudFormation에서 논리적 ID는 영숫자 (A-Za-z0-9)로 템플릿 내에서 고유해야합니다.
논리 이름을 사용하여 템플리트의 다른 부분에서 자원을 참조합니다.
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/concept-resources.html