if you choose to use the software version of our 1Z0-804 Engine study guide, you will find that you can download our 1Z0-804 Engine exam prep on more than one computer and you can practice our 1Z0-804 Engine exam questions offline as well. We strongly believe that the software version of our 1Z0-804 Engine study materials will be of great importance for you to prepare for the exam and all of the employees in our company wish you early success! If you prepare based on our 1Z0-804 Engine exam simulations files, you will feel easy to clear exam once certainly. If you want to do something different and stand out, you should not only work hard but also constantly strive to improve including education qualification and career certificate. There is a great deal of advantages of our 1Z0-804 Engine exam questions you can spare some time to get to know.
Java and Middleware 1Z0-804 It is unmarched high as 98% to 100%.
Java and Middleware 1Z0-804 Engine - Java SE 7 Programmer II Exam If you make the best use of your time and obtain a useful certification you may get a senior position ahead of others. To ensure that you have a more comfortable experience before you choose to purchase our 1Z0-804 Test Syllabus exam quiz, we provide you with a trial experience service. Once you decide to purchase our 1Z0-804 Test Syllabus learning materials, we will also provide you with all-day service.
Before you try to attend the 1Z0-804 Engine practice exam, you need to look for best learning materials to easily understand the key points of 1Z0-804 Engine exam prep. There are 1Z0-804 Engine real questions available for our candidates with accurate answers and detailed explanations. We are ready to show you the most reliable 1Z0-804 Engine pdf vce and the current exam information for your preparation of the test.
The way to pass the Oracle 1Z0-804 Engine actual test is diverse.
In order to meet the requirements of our customers, Our 1Z0-804 Engine test questions carefully designed the automatic correcting system for customers. It is known to us that practicing the incorrect questions is very important for everyone, so our 1Z0-804 Engine exam question provide the automatic correcting system to help customers understand and correct the errors. If you want to improve your correct rates of exam, we believe the best method is inscribed according to the fault namely this in appearing weak sports, specific aim ground consolidates knowledge is nodded. Our 1Z0-804 Engine guide torrent will help you establish the error sets. We believe that it must be very useful for you to take your exam, and it is necessary for you to use our 1Z0-804 Engine test questions.
1Z0-804 Engine online test engine can simulate the actual test, which will help you familiar with the environment of the 1Z0-804 Engine real test. The 1Z0-804 Engine self-assessment features can bring you some convenience.
1Z0-804 PDF DEMO:
QUESTION NO: 1
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: 2
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: 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.
The three versions of our APMG-International AgilePM-Practitioner exam questions are PDF & Software & APP version for your information. Oracle Nutanix NCP-CI-Azure certification exam is a high demand exam tests in IT field because it proves your ability and professional technology. Cisco 300-425 - We can promise that we are going to provide you with 24-hours online efficient service after you buy our Java SE 7 Programmer II Exam guide torrent. Our ISTQB CT-AI exam dumps can be quickly downloaded to the eletronic devices. Google Google-Workspace-Administrator - In this highly competitive modern society, everyone needs to improve their knowledge level or ability through various methods so as to obtain a higher social status.
Updated: May 28, 2022