Only in this way can you prepare well for the exam. In recent, Omgzlook began to provide you with the latest exam dumps about IT certification test, such as Oracle 1Z0-804 Test Testking certification dumps are developed based on the latest IT certification exam. Omgzlook Oracle 1Z0-804 Test Testking certification training dumps will tell you the latest news about the exam. We have three versions packages of the 1Z0-804 Test Testking exam questions to help you comprehensively. Also, all contents are carefully prepared by our researchers. It is absolutely trustworthy website.
Java and Middleware 1Z0-804 Or you can choose to free update your exam dumps.
Java and Middleware 1Z0-804 Test Testking - Java SE 7 Programmer II Exam Being considered the most authentic brand in this career, our professional experts are making unremitting efforts to provide our customers the latest and valid {CertName} exam simulation. You will find some exam techniques about how to pass Valid Free 1Z0-804 Study Guide exam from the exam materials and question-answer analysis provided by our Omgzlook. Besides, to make you be rest assured of our dumps, we provide Valid Free 1Z0-804 Study Guide exam demo for you to free download.
But we can help all of these candidates on 1Z0-804 Test Testking study questions. Numerous grateful feedbacks form our loyal customers proved that we are the most popular vendor in this field to offer our 1Z0-804 Test Testking preparation questions. You can totally relay on us.
Because it can help you prepare for the Oracle 1Z0-804 Test Testking exam.
Which kind of 1Z0-804 Test Testking certificate is most authorized, efficient and useful? We recommend you the 1Z0-804 Test Testking certificate because it can prove that you are competent in some area and boost outstanding abilities. If you buy our 1Z0-804 Test Testking study materials you will pass the test smoothly and easily. We boost professional expert team to organize and compile the 1Z0-804 Test Testking training guide diligently and provide the great service.
A lot of people have given up when they are preparing for the 1Z0-804 Test Testking exam. However, we need to realize that the genius only means hard-working all one’s life.
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
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
QUESTION 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 {
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: 4
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: 5
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.
More importantly, if you take our products into consideration, our SASInstitute A00-485 study materials will bring a good academic outcome for you. Firstly, you will learn many useful knowledge and skills from our Juniper JN0-664 exam guide, which is a valuable asset in your life. Choosing our Microsoft AZ-900-KR study material, you will find that it will be very easy for you to overcome your shortcomings and become a persistent person. Do not worry, in order to help you solve your problem and let you have a good understanding of our EMC D-CIS-FN-23 study practice dump, the experts and professors from our company have designed the trial version for all people. With the help of our Huawei H19-431_V1.0 training guide, your dream won’t be delayed anymore.
Updated: May 28, 2022