In the process of using the Java SE 7 Programmer II Exam study training dumps, once users have any questions about our study materials, the user can directly by E-mail us, our products have a dedicated customer service staff to answer for the user, they are 24 hours service for you, we are very welcome to contact us by E-mail and put forward valuable opinion for us. Our 1Z0-804 Reliable Test Objectives Pdf latest questions already have many different kinds of learning materials, users may be confused about the choice, what is the most suitable 1Z0-804 Reliable Test Objectives Pdf test guide? Believe that users will get the most satisfactory answer after consultation. Our online service staff is professionally trained, and users' needs about 1Z0-804 Reliable Test Objectives Pdf test guide can be clearly understood by them. We believe our consummate after-sale service system will make our customers feel the most satisfactory. Our company has designed the perfect after sale service system for these people who buy our 1Z0-804 Reliable Test Objectives Pdf practice materials. Our 1Z0-804 Reliable Test Objectives Pdf exam practice questions on the market this recruitment phenomenon, tailored for the user the fast pass the examination method of study, make the need to get a good job have enough leverage to compete with other candidates.
Java and Middleware 1Z0-804 You must be very surprised.
And we will give you 100% success guaranteed on the 1Z0-804 - Java SE 7 Programmer II Exam Reliable Test Objectives Pdf training guide. When you want to correct the answer after you finish learning, the correct answer for our 1Z0-804 Test Dumps Pdf test prep is below each question, and you can correct it based on the answer. In addition, we design small buttons, which can also show or hide the 1Z0-804 Test Dumps Pdf exam torrent, and you can flexibly and freely choose these two modes according to your habit.
Once you choose our learning materials, your dream that you have always been eager to get Oracle certification which can prove your abilities will realized. You will have more competitive advantages than others to find a job that is decent. We are convinced that our 1Z0-804 Reliable Test Objectives Pdf exam questions can help you gain the desired social status and thus embrace success.
Our Oracle 1Z0-804 Reliable Test Objectives Pdf exam questions are your best choice.
According to the survey, the average pass rate of our candidates has reached 99%. High passing rate must be the key factor for choosing, which is also one of the advantages of our 1Z0-804 Reliable Test Objectives Pdf real study dumps. Our 1Z0-804 Reliable Test Objectives Pdf exam questions have been widely acclaimed among our customers, and the good reputation in industry prove that choosing our study materials would be the best way for you, and help you gain the 1Z0-804 Reliable Test Objectives Pdf certification successfully. With about ten years’ research and development we still keep updating our 1Z0-804 Reliable Test Objectives Pdf prep guide, in order to grasp knowledge points in accordance with the exam, thus your study process would targeted and efficient.
And our professional 1Z0-804 Reliable Test Objectives Pdf study materials determine the high pass rate. According to the research statistics, we can confidently tell that 99% candidates after using our products have passed the 1Z0-804 Reliable Test Objectives Pdf exam.
1Z0-804 PDF DEMO:
QUESTION NO: 1
Given the fragment: If thread a and thread b are running, but not completing, which two could be occurring?
A.livelock
B.deadlock
C.starvation
D.loose coupling
E.cohesion
Answer: A,B
Explanation:
A: A thread often acts in response to the action of another thread. If the other thread's action is also a response to the action of another thread, then livelock may result. A thread often acts in response to the action of another thread. If the other thread's action is also a response to the action of another thread, then livelock may result.
B: Deadlock describes a situation where two or more threads are blocked forever, waiting for each other.
QUESTION NO: 2
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:
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.
QUESTION NO: 3
Given the code fragment:
What is the result?
A.Null B D
B.Null B null D
C.B D
D.D
E.An exception is thrown at runtime
Answer: C
QUESTION NO: 4
Given:
Which two are true?
A.A runtime exception is thrown on line 9.
B.No output is produced.
C.Greeting is printed once.
D.Greeting is printed twice.
E.No new threads of execution are started within the main method.
F.One new thread of execution is started within the main method.
G.Two new threads of execution are started within the main method.
Answer: C,E
Explanation:
Thread t2 is executed. Execution of T2 starts executionen of t1. Greeting is printed during the execution of t1.
QUESTION NO: 5
Given: javac Test.java java ea Test
And the commands:
What is the result?
A.Compilation fails
B.Standard Edition Enterprise Edition Micro Edition
C.Standard Edition class java.lang.AssertionError Micro Edition
D.Standard Edition is printed and an Assertion Error is thrown
Answer: D
Explanation:
javac Test.java
will compile the program.
As for command line:
java ea Test
First the code will produce the output:
Standard Edition
See Note below.
The ea option will enable assertions. This will make the following line in the switch statement to be run:
default: assert false;
This will throw an assertion error. This error will be caught. An the class of the assertion error
(class java.lang.AssertionError) will be printed by the following line:
System.out.println(e.getClass());
Note:The java tool launches a Java application. It does this by starting a Java runtime environment, loading a specified class, and invoking that class's main method. The method declaration must look like the following:
public static void main(String args[])
Paramater ea:
-enableassertions[:<package name>"..." | :<class name> ] -ea[:<package name>"..." | :<class name> ]
Enable assertions. Assertions are disabled by default. With no arguments, enableassertions or -ea enables assertions.
Note 2:
An assertion is a statement in the JavaTM programming language that enables you to test your assumptions about your program. Each assertion contains a boolean expression that you believe will be true when the assertion
executes. If it is not true, the system will throw an error.
public class AssertionError extends Error
Thrown to indicate that an assertion has failed.
Note 3:
The javac command compiles Java source code into Java bytecodes. You then use the Java interpreter - the
java command - to interprete the Java bytecodes.
Reference:java - the Java application launcher
Reference:java.langClass AssertionError
And our Palo Alto Networks PCNSC study materials are warmly praised and welcomed by the customers all over the world. According to the research statistics, we can confidently tell that 99% candidates have passed the Microsoft DP-100 exam. Our passing rate of the EMC D-XTR-MN-A-24 study guide has reached up to 98 to 100 percent up to now, so you cannot miss this opportunity. But our IAPP CIPT exam questions have made it. If the user finds anything unclear in the Microsoft PL-400-KR exam questions exam, we will send email to fix it, and our team will answer all of your questions related to the Microsoft PL-400-KR actual exam.
Updated: May 28, 2022