Our website always trying to bring great convenience to our candidates who are going to attend the 1Z0-804 Valid Test Dumps Materials practice test. You can practice our 1Z0-804 Valid Test Dumps Materials dumps demo in any electronic equipment with our online test engine. To all customers who bought our 1Z0-804 Valid Test Dumps Materials pdf torrent, all can enjoy one-year free update. Do not lose the wonderful chance to advance with times. Just come and have a try on our 1Z0-804 Valid Test Dumps Materials study questions! It can be used on Phone, Ipad and so on.
Java and Middleware 1Z0-804 There is no doubt that you can get a great grade.
You can also try the simulated exam environment with 1Z0-804 - Java SE 7 Programmer II Exam Valid Test Dumps Materials software on PC. We esteem your variant choices so all these versions of 1Z0-804 Latest Test Dumps exam guides are made for your individual preference and inclination. Our company has been putting emphasis on the development and improvement of 1Z0-804 Latest Test Dumps test prep over ten year without archaic content at all.
In a word, our 1Z0-804 Valid Test Dumps Materials exam questions have built good reputation in the market. We sincerely hope that you can try our 1Z0-804 Valid Test Dumps Materials learning quiz. You will surely benefit from your correct choice.
Oracle 1Z0-804 Valid Test Dumps Materials - It is very easy and convenient to use and find.
As the employment situation becoming more and more rigorous, it’s necessary for people to acquire more 1Z0-804 Valid Test Dumps Materials skills and knowledge when they are looking for a job. Enterprises and institutions often raise high acquirement for massive candidates, and aim to get the best quality talents. Thus a high-quality 1Z0-804 Valid Test Dumps Materials certification will be an outstanding advantage, especially for the employees, which may double your salary, get you a promotion. So choose us, choose a brighter future.
Being dedicated to these practice materials painstakingly and pooling useful points into our 1Z0-804 Valid Test Dumps Materials exam materials with perfect arrangement and scientific compilation of messages, our 1Z0-804 Valid Test Dumps Materials practice materials can propel the exam candidates to practice with efficiency. Our experts are constantly looking for creative way to immortalize our 1Z0-804 Valid Test Dumps Materials actual exam in this line.
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: 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: 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.
ECCouncil 212-82 - There is an old saying goes, good memory is inferior to sodden ability to write, so we believe that it is a highly productive way for you to memory the knowledge point and review the reference books more effectively. SAP C-BW4H-2404 exam questions can fuel your speed and help you achieve your dream. So without doubt, our Network Appliance NS0-304 exam questions are always the latest and valid. SAP C_THR96_2405 - It is easy for you to pass the exam because you only need 20-30 hours to learn and prepare for the exam. So if you are in a dark space, our Amazon ANS-C01 exam questions can inspire you make great improvements.
Updated: May 28, 2022