Besides, the pollster conducted surveys of public opinions of our 1Z0-804 Materials study engine and get desirable outcomes that more than 98 percent of exam candidates feel rewarding after using our 1Z0-804 Materials actual exam. And we enjoy their warm feedbacks to show and prove that we really did a good job in this career. You can totally rely on us! 1Z0-804 Materials study engine is very attentive to provide a demo for all customers who concerned about our products, whose purpose is to allow customers to understand our product content before purchase. Many students suspect that if 1Z0-804 Materials learning material is really so magical? Does it really take only 20-30 hours to pass such a difficult certification exam successfully? It is no exaggeration to say that you will be able to successfully pass the exam with our 1Z0-804 Materials exam questions. The download and install set no limits for the amount of the computers and the persons who use 1Z0-804 Materials test prep.
But our 1Z0-804 Materials exam questions have made it.
If the user finds anything unclear in the 1Z0-804 - Java SE 7 Programmer II Exam Materials exam questions exam, we will send email to fix it, and our team will answer all of your questions related to the 1Z0-804 - Java SE 7 Programmer II Exam Materials actual exam. Every page is carefully arranged by our experts with clear layout and helpful knowledge to remember. Our Valid Test Guide 1Z0-804 Files exam questions just focus on what is important and help you achieve your goal.
Among all substantial practice materials with similar themes, our 1Z0-804 Materials practice materials win a majority of credibility for promising customers who are willing to make progress in this line. With excellent quality at attractive price, our 1Z0-804 Materials exam questions get high demand of orders in this fierce market. You can just look at the data about the hot hit on the 1Z0-804 Materials study braindumps everyday, and you will know that how popular our 1Z0-804 Materials learning guide is.
Oracle 1Z0-804 Materials - With it you can secure your career.
The moment you choose to go with our 1Z0-804 Materials study materials, your dream will be more clearly presented to you. Next, through my introduction, I hope you can have a deeper understanding of our 1Z0-804 Materials learning quiz. We really hope that our 1Z0-804 Materials practice engine will give you some help. In fact, our 1Z0-804 Materials exam questions have helped tens of thousands of our customers successfully achieve their certification.
The curtain of life stage may be opened at any time, the key is that you are willing to show, or choose to avoid. Most of People who can seize the opportunityin front of them are successful.
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: 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: 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.
Now that more people are using mobile phones to learn our EMC D-SF-A-24 study guide, you can also choose the one you like. Amazon AI1-C01 - What's more important, you must choose the most effective exam materials that suit you. Once you have submitted your practice time, IBM C1000-127 study tool system will automatically complete your operation. Fortinet FCP_FMG_AD-7.4 - Even if you have a very difficult time preparing for the exam, you also can pass your exam successfully. In such a tough situation, how can we highlight our advantages? It may be a good way to get the test IBM C1000-172 certification.
Updated: May 28, 2022