If you have bought the 1Z0-804 Exam Testking exam questions before, then you will know that we have free demos for you to download before your purchase. Free demos of our 1Z0-804 Exam Testking study guide are understandable materials as well as the newest information for your practice. Under coordinated synergy of all staff, our 1Z0-804 Exam Testking practice braindumps achieved a higher level of perfection by keeping close attention with the trend of dynamic market. If you want to buy our 1Z0-804 Exam Testking training guide in a preferential price, that’s completely possible. In order to give back to the society, our company will prepare a number of coupons on our 1Z0-804 Exam Testking learning dumps. By concluding quintessential points into 1Z0-804 Exam Testking actual exam, you can pass the exam with the least time while huge progress.
Java and Middleware 1Z0-804 Try it now!
Java and Middleware 1Z0-804 Exam Testking - Java SE 7 Programmer II Exam Many people always are stopped by the difficult questions. If you want to get a comprehensive idea about our real 1Z0-804 Examcollection Free Dumps study materials. It is convenient for you to download the free demo, all you need to do is just to find the “Download for free” item, and you will find there are three kinds of versions of 1Z0-804 Examcollection Free Dumps learning guide for you to choose from namely, PDF Version Demo, PC Test Engine and Online Test Engine, you can choose to download any one version of our 1Z0-804 Examcollection Free Dumps exam questions as you like.
The the probability of passing Oracle certification 1Z0-804 Exam Testking exam is very small, but the reliability of Omgzlook can guarantee you to pass the examination of this probability. Our Omgzlook have a huge IT elite team. They will accurately and quickly provide you with Oracle certification 1Z0-804 Exam Testking exam materials and timely update Oracle 1Z0-804 Exam Testking exam certification exam practice questions and answers and binding.
Oracle 1Z0-804 Exam Testking - It can help you to pass the exam successfully.
With 1Z0-804 Exam Testking study engine, you will get rid of the dilemma that you work hard but cannot improve. With our 1Z0-804 Exam Testking learning materials, you can spend less time but learn more knowledge than others. 1Z0-804 Exam Testking exam questions will help you reach the peak of your career. Just think of that after you get the 1Z0-804 Exam Testking certification, you will have a lot of opportunities of going to biger and better company and getting higher incomes! what a brighter future!
You have seen Omgzlook's Oracle 1Z0-804 Exam Testking exam training materials, it is time to make a choice. You can choose other products, but you have to know that Omgzlook can bring you infinite interests.
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.
In order to facilitate the user's offline reading, the CompTIA PT0-003 study braindumps can better use the time of debris to learn, especially to develop PDF mode for users. Amazon DOP-C02 - Omgzlook is a professional website that providing IT certification training materials. We can proudly claim that you can successfully pass the exam just on the condition that you study with our Huawei H19-308_V4.0 preparation materials for 20 to 30 hours. ACFE CFE - Because it will make you pass the exam easily, since then rise higher and higher on your career path. Amazon DOP-C02-KR - If you do not own one or two kinds of skills, it is difficult for you to make ends meet in the modern society.
Updated: May 28, 2022