1Z0-804日本語解説集、Java SE 7 Programmer II Exam

 

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1Z0-804試験番号:1Z0-804問題集
試験科目:Java SE 7 Programmer II Exam
最近更新時間:2016-12-05
問題と解答:全150問 1Z0-804 最新テスト
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>> 1Z0-804 最新テスト

 

NO.1 Given:
Which two are true?
A. One new thread of execution is started within the main method.
B. Greeting is printed once.
C. Greeting is printed twice.
D. A runtime exception is thrown on line 9.
E. Two new threads of execution are started within the main method.
F. No output is produced.
G. No new threads of execution are started within the main method.
Answer: B,G

1Z0-804専門   
Explanation:
Thread t2 is executed. Execution of T2 starts executionen of t1. Greeting is printed during the
execution of t1.

NO.2 Given the code fragment:
What is the result of the employees table has no records before the code executed?
A. 3 John 4 Jack
B. 1 Sam
C. 1 Sam 3 John 4 Jack
D. 4 Jack
Answer: A
Explanation:
AutoCommit is set to false. The two following statements will be within the same transaction.
stmt.executeUpdate("insert into employees values(1,'Sam')");
stmt.executeUpdate("insert into employees values(2,'Jane')");
These two statements are rolled-back through (the savepoint is ignored! the savepoint must be
specified (e.g.
conn.rollback(save1); ) in the rollback if you want to rollback to the savepoint):
conn.rollback() ;
The next two insert statements are executed fine. Their result will be in the output.

NO.3 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. class Singleton {
private static Singleton instance = new Singleton();
protected Singleton () {}
public static Singleton getInstance () {
return instance;
}
}
D. enum Singleton {
INSTANCE;
}
Answer: A,D

1Z0-804好評   
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.

NO.4 Given the code fragment:
What is the result?
A. Null B null D
B. An exception is thrown at runtime
C. Null B D
D. D
E. B D
Answer: E

1Z0-804復習時間   

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