We all need some professional certificates such as {1Z0-804 Sample Questions Answers to prove ourselves in different working or learning condition. So making right decision of choosing useful practice materials is of vital importance. Here we would like to introduce our 1Z0-804 Sample Questions Answers practice materials for you with our heartfelt sincerity. Our 1Z0-804 Sample Questions Answers study materials have successfully helped a lot of candidates achieve their certifications and become better. Our 1Z0-804 Sample Questions Answers learning guide will be your best choice. So why choose other products that can’t assure your success? With Omgzlook, you are guaranteed to pass 1Z0-804 Sample Questions Answers certification on your very first try.
Java and Middleware 1Z0-804 So you can take a best preparation for the exam.
Java and Middleware 1Z0-804 Sample Questions Answers - Java SE 7 Programmer II Exam They still attentively accomplish their tasks. Omgzlook's training tool has strong pertinence, which can help you save a lot of valuable time and energy to pass IT certification exam. Our exercises and answers and are very close true examination questions.
Our 1Z0-804 Sample Questions Answers study materials absolutely can add more pleasure to your life. You just need a chance to walk out. You can click to see the comments of the 1Z0-804 Sample Questions Answers exam braindumps and how we changed their life by helping them get the 1Z0-804 Sample Questions Answers certification.
Oracle 1Z0-804 Sample Questions Answers - It will help us to pass the exam successfully.
What is your reason for wanting to be certified with 1Z0-804 Sample Questions Answers? I believe you must want to get more opportunities. As long as you use 1Z0-804 Sample Questions Answers learning materials and get a 1Z0-804 Sample Questions Answers certificate, you will certainly be appreciated by the leaders. As you can imagine that you can get a promotion sooner or latter, not only on the salary but also on the position, so what are you waiting for? Just come and buy our 1Z0-804 Sample Questions Answers study braindumps.
We are committed to your success. Omgzlook's Oracle 1Z0-804 Sample Questions Answers exam training materials is the best training materials.
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.
Based on the credibility in this industry, our EMC D-CS-DS-23 study braindumps have occupied a relatively larger market share and stable sources of customers. Network Appliance NS0-521 - Then, you need to upgrade and develop yourself. As long as you study with our Nutanix NCP-MCA exam questions for 20 to 30 hours, you will pass the exam for sure. CompTIA SY0-701 - Whatever exam you choose to take, Omgzlook training dumps will be very helpful to you. Moreover our HP HP2-I57 test guides provide customers with supplement service-mock test, which can totally inspire them to study hard and check for defects during their learning process.
Updated: May 28, 2022