Our 1Z0-804 Valid Practice Questions Free study materials have included all significant knowledge about the exam. So you do not need to pick out the important points by yourself. Also, our 1Z0-804 Valid Practice Questions Free practice engine can greatly shorten your preparation time of the exam. Our 1Z0-804 Valid Practice Questions Free training braindumps are famous for its wonderful advantages. The content is carefully designed for the 1Z0-804 Valid Practice Questions Free exam, rich question bank and answer to enable you to master all the test knowledge in a short period of time. The updated version of the 1Z0-804 Valid Practice Questions Free study guide will be different from the old version.
Java and Middleware 1Z0-804 It is quite convenient.
Java and Middleware 1Z0-804 Valid Practice Questions Free - Java SE 7 Programmer II Exam Our study materials come to your help. If you are better, you will have a more relaxed life. 1Z0-804 Latest Study Guide Ppt guide materials allow you to increase the efficiency of your work.
our 1Z0-804 Valid Practice Questions Free study materials will also save your time and energy in well-targeted learning as we are going to make everything done in order that you can stay focused in learning our 1Z0-804 Valid Practice Questions Free study materials without worries behind. We are so honored and pleased to be able to read our detailed introduction and we will try our best to enable you a better understanding of our 1Z0-804 Valid Practice Questions Free study materials better.
Oracle 1Z0-804 Valid Practice Questions Free - You will become friends with better people.
Are you an IT staff? Are you enroll in the most popular IT certification exams? If you tell me "yes", then I will tell you a good news that you're in luck. Omgzlook's Oracle 1Z0-804 Valid Practice Questions Free exam training materials can help you 100% pass the exam. This is a real news. If you want to scale new heights in the IT industry, select Omgzlook please. Our training materials can help you pass the IT exams. And the materials we have are very cheap. Do not believe it, see it and then you will know.
In a year after your payment, we will inform you that when the 1Z0-804 Valid Practice Questions Free exam guide should be updated and send you the latest version. Our company has established a long-term partnership with those who have purchased our 1Z0-804 Valid Practice Questions Free exam questions.
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
Microsoft MB-820 - It includes questions and answers, and issimilar with the real exam questions. We have clear data collected from customers who chose our PMI PMO-CP practice braindumps, and the passing rate is 98-100 percent. SAP C-S4CPR-2408 - With this certification, you can light up your heart light in your life. To make our EMC D-PDC-DY-23 simulating exam more precise, we do not mind splurge heavy money and effort to invite the most professional teams into our group. VMware 2V0-31.24 - What's more, the excellent dumps can stand the test rather than just talk about it.
Updated: May 28, 2022