People are engaged in modern society. So our goal is to achieve the best learning effect in the shortest time. So our 1Z0-804 Reliable Test Collection Pdf test prep will not occupy too much time. As long as you practice our 1Z0-804 Reliable Test Collection Pdf test question, you can pass exam quickly and successfully. By using them, you can not only save your time and money, but also pass 1Z0-804 Reliable Test Collection Pdf practice exam without any stress. One of the great advantages is that you will soon get a feedback after you finish the exercises.
Java and Middleware 1Z0-804 You do not need to study day and night.
1Z0-804 - Java SE 7 Programmer II Exam Reliable Test Collection Pdf exam prep look forward to meeting you. At the same time, we have formed a group of passionate researchers and experts, which is our great motivation of improvement. Every once in a while we will release the new version study materials.
After you use our study materials, you can get 1Z0-804 Reliable Test Collection Pdf certification, which will better show your ability, among many competitors, you will be very prominent. Using 1Z0-804 Reliable Test Collection Pdf exam prep is an important step for you to improve your soft power. I hope that you can spend a little time understanding what our study materials have to attract customers compared to other products in the industry.
Oracle 1Z0-804 Reliable Test Collection Pdf - It will be a first step to achieve your dreams.
There may be a lot of people feel that the preparation process for 1Z0-804 Reliable Test Collection Pdf exams is hard and boring, and hard work does not necessarily mean good results, which is an important reason why many people are afraid of examinations. Today, our 1Z0-804 Reliable Test Collection Pdf exam materials will radically change this. High question hit rate makes you no longer aimless when preparing for the exam, so you just should review according to the content of our 1Z0-804 Reliable Test Collection Pdf study guide prepared for you.
Our 1Z0-804 Reliable Test Collection Pdf real exam try to ensure that every customer is satisfied, which can be embodied in the convenient and quick refund process. Although the passing rate of our 1Z0-804 Reliable Test Collection Pdf training quiz is close to 100%, if you are still worried, we can give you another guarantee: if you don't pass the exam, you can get a full refund.
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.
Juniper JN0-105 - Our target is to reduce your pressure and improve your learning efficiency from preparing exam. If you buy our Microsoft MB-820 exam questions, then you will find that Our Microsoft MB-820 actual exam has covered all the knowledge that must be mastered in the exam. And our Lpi 701-100 training questions are popular in the market. So, please give the HP HPE6-A72 study materials a chance to help you. EMC D-PM-IN-23 - The three versions are very flexible for all customers to operate.
Updated: May 28, 2022