Omgzlook Oracle 1Z0-804참고자료덤프의 질문들과 답변들은 100%의 지식 요점과 적어도 98%의 시험 문제들을 커버하는,수년동안 가장 최근의Oracle 1Z0-804참고자료시험 요점들을 컨설팅 해 온 시니어 프로 IT 전문가들의 그룹에 의해 구축 됩니다. Omgzlook의 IT전문가들이 자신만의 경험과 끊임없는 노력으로 최고의Oracle 1Z0-804참고자료학습자료를 작성해 여러분들이Oracle 1Z0-804참고자료시험에서 패스하도록 도와드립니다. IT인증자격증은 국제적으로 승인받는 자격증이기에 많이 취득해두시면 취업이나 승진이나 이직이나 모두 편해집니다. 다른 사람이 없는 자격증을 내가 가지고 있다는것은 실력을 증명해주는 수단입니다. 다른사이트에 있는 자료들도 솔직히 모두 정확성이 떨어지는건 사실입니다.
Java and Middleware 1Z0-804 완벽한 관연 지식터득은 물론입니다.
Omgzlook는 자격증 응시자에게Oracle 1Z0-804 - Java SE 7 Programmer II Exam참고자료 시험 준비를 위한 현재 그리고 가장 최근의 자료들을 제공하는 이 산업 영역의 리더입니다. Oracle 1Z0-804 Dump인증시험은 현재IT업계에서 아주 인기 있는 시험입니다.많은 IT인사들이 관연 자격증을 취득하려고 노력하고 있습니다.Oracle 1Z0-804 Dump인증시험에 대한 열기는 식지 않습니다.Oracle 1Z0-804 Dump자격증은 여러분의 사회생활에 많은 도움이 될 것이며 연봉상승 등 생활보장에 업그레이드 될 것입니다.
여러분은Oracle 1Z0-804참고자료인증시험을 패스함으로 IT업계관련 직업을 찿고자하는 분들에게는 아주 큰 가산점이 될수 있으며, 성덩한 IT업계사업자와 한걸음 가까와 집니다.
Oracle 1Z0-804참고자료 - Omgzlook는 업계에 많이 알려져있는 덤프제공 사이트입니다.
지금 사회에 능력자들은 아주 많습니다.it인재들도 더욱더 많아지고 있습니다.많은 it인사들은 모두 관연 it인증시험에 참가하여 자격증취득을 합니다.자기만의 자리를 확실히 지키고 더 높은 자리에 오르자면 필요한 스펙이니까요.1Z0-804참고자료시험은Oracle인증의 중요한 시험이고 또 많은 it인사들은Oracle자격증을 취득하려고 노력하고 있습니다.
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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.
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Updated: May 28, 2022