Matt Walker Matt Walker's Profile Page

Matt Walker Matt Walker

0 Course Enrolled • 0 Course Completed

Biography

퍼펙트한1z1-830 100％시험패스덤프자료인증덤프

경쟁율이 심한 IT시대에Oracle 1z1-830인증시험을 패스함으로 IT업계 관련 직종에 종사하고자 하는 분들에게는 아주 큰 가산점이 될수 있고 자신만의 위치를 보장할수 있으며 더욱이는 한층 업된 삶을 누릴수 있을수도 있습니다. Oracle 1z1-830시험을 가장 쉽게 합격하는 방법이 DumpTOP의Oracle 1z1-830 덤프를 마스터한느것입니다.

IT업계에 종사하시는 분은 국제공인 IT인증자격증 취득이 얼마나 힘든지 알고 계실것입니다. 특히 시험이 영어로 되어있어 부담을 느끼시는 분도 계시는데 DumpTOP를 알게 된 이상 이런 고민은 버리셔도 됩니다. DumpTOP의Oracle 1z1-830덤프는 모두 영어버전으로 되어있어Oracle 1z1-830시험의 가장 최근 기출문제를 분석하여 정답까지 작성해두었기에 문제와 답만 외우시면 시험합격가능합니다.

>> 1z1-830 100％시험패스 덤프자료 <<

1z1-830최신버전 공부자료 & 1z1-830퍼펙트 최신 덤프공부자료

Oracle 1z1-830인증시험은 현재IT인사들 중 아주 인기 잇는 인증시험입니다.Oracle 1z1-830시험패스는 여러분의 하시는 일과 생활에서 많은 도움을 줄뿐만 아니라 중요한 건 여러분의IT업계에서의 자기만의 자리를 지키실 수 잇습니다.이렇게 좋은 시험이니 많은 분들이 응시하려고 합니다,하지만 패스 율은 아주 낮습니다.

최신 Java SE 1z1-830 무료샘플문제 (Q18-Q23):

질문 # 18
Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A. Compilation fails
B. ArithmeticException
C. RuntimeException
D. IOException

정답：B

설명：
In this code, the try block throws an IOException. The catch block catches this exception and throws a new RuntimeException. Regardless of exceptions thrown in the try or catch blocks, the finally block is always executed. In this case, the finally block throws an ArithmeticException.
When an exception is thrown in a finally block, it overrides any previous exceptions that were thrown in the try or catch blocks. Therefore, the ArithmeticException thrown in the finally block is the exception that propagates out of the method. As a result, the program terminates with an ArithmeticException.

질문 # 19
What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A. nothing
B. static
C. Compilation fails
D. default

정답：B

설명：
In this code, we have two interfaces and a class with a main method:
* WithDefaultMethod Interface:
* Declares a default method print() that outputs "default".
* WithStaticMethod Interface:
* Extends WithDefaultMethod.
* Declares a static method print() that outputs "static".
* DefaultAndStaticMethods Class:
* Contains the main method, which calls WithStaticMethod.print().
Key Points:
* Static Methods in Interfaces:
* Static methods in interfaces are not inherited by implementing or extending classes or interfaces.
They belong solely to the interface in which they are declared.
* Default Methods in Interfaces:
* Default methods can be inherited by implementing classes, but they cannot be overridden by static methods in subinterfaces.
Execution Flow:
* The main method calls WithStaticMethod.print().
* This invokes the static method print() defined in the WithStaticMethod interface, which outputs "static".
Therefore, the program compiles successfully and prints static.

질문 # 20
Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?

A. Compilation fails.
B. It throws an exception.
C. It prints all elements, but changes made during iteration may not be visible.
D. It prints all elements, including changes made during iteration.

정답：C

설명：
* Understanding CopyOnWriteArrayList
* CopyOnWriteArrayList is a thread-safe variant of ArrayList whereall mutative operations (add, set, remove, etc.) create a new copy of the underlying array.
* This meansiterations will not reflect modifications made after the iterator was created.
* Instead of modifying the existing array, a new copy is created for modifications, ensuring that readers always see a consistent snapshot.
* Thread Execution Behavior
* Thread 1 (Writer Thread)adds "D" to the list.
* Thread 2 (Reader Thread)iterates over the list.
* The reader thread gets a snapshot of the listbefore"D" is added.
* The output may look like:
mathematica
Read element: A
Read element: B
Read element: C
Element added: D
* "D" may not appear in the output of the reader threadbecause the iteration occurs on a snapshot before the modification.
* Why doesn't it print all elements including changes?
* Since CopyOnWriteArrayList doesnot allow changes to be visible during iteration, the reader threadwill not see "D"if it started iterating before "D" was added.
Thus, the correct answer is:"It prints all elements, but changes made during iteration may not be visible." References:
* Java SE 21 - CopyOnWriteArrayList

질문 # 21
Given:
java
var sList = new CopyOnWriteArrayList<Customer>();
Which of the following statements is correct?

A. Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.
B. The CopyOnWriteArrayList class is a thread-safe variant of ArrayList where all mutative operations are implemented by making a fresh copy of the underlying array.
C. The CopyOnWriteArrayList class is not thread-safe and does not prevent interference amongconcurrent threads.
D. The CopyOnWriteArrayList class does not allow null elements.
E. The CopyOnWriteArrayList class's iterator reflects all additions, removals, or changes to the list since the iterator was created.

정답：B

설명：
The CopyOnWriteArrayList is a thread-safe variant of ArrayList in which all mutative operations (such as add, set, and remove) are implemented by creating a fresh copy of the underlying array. This design allows for safe iteration over the list without requiring external synchronization, as iterators operate over a snapshot of the array at the time the iterator was created. Consequently, modifications made to the list after the creation of an iterator are not reflected in that iterator.
docs.oracle.com
Evaluation of Options:
* Option A:Correct. This statement accurately describes the behavior of CopyOnWriteArrayList.
* Option B:Incorrect. CopyOnWriteArrayList is thread-safe and is designed to prevent interference among concurrent threads.
* Option C:Incorrect. Iterators of CopyOnWriteArrayList do not reflect additions, removals, or changes made to the list after the iterator was created; they operate on a snapshot of the list's state at the time of their creation.
* Option D:Incorrect. CopyOnWriteArrayList allows null elements.
* Option E:Incorrect. Element-changing operations on iterators, such as remove, set, and add, are not supported in CopyOnWriteArrayList and will throw UnsupportedOperationException.

질문 # 22
Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?

A. False
B. True

정답：A

설명：
In this code, a HashMap is instantiated using the var keyword:
java
var ceo = new HashMap<>();
The diamond operator <> is used without explicit type arguments. While the diamond operatorallows the compiler to infer types in many cases, when using var, the compiler requires explicit type information to infer the variable's type.
Therefore, the code will not compile because the compiler cannot infer the type of the HashMap when both var and the diamond operator are used without explicit type parameters.
To fix this issue, provide explicit type parameters when creating the HashMap:
java
var ceo = new HashMap<String, String>();
Alternatively, you can specify the variable type explicitly:
java
Map<String, String>
contentReference[oaicite:0]{index=0}

질문 # 23
......

DumpTOP의 Oracle인증 1z1-830덤프의 무료샘플을 이미 체험해보셨죠? DumpTOP의 Oracle인증 1z1-830덤프에 단번에 신뢰가 생겨 남은 문제도 공부해보고 싶지 않나요? DumpTOP는 고객님들의 시험부담을 덜어드리기 위해 가벼운 가격으로 덤프를 제공해드립니다. DumpTOP의 Oracle인증 1z1-830로 시험패스하다 더욱 넓고 좋은곳으로 고고싱 하세요.

1z1-830최신버전 공부자료: https://www.dumptop.com/Oracle/1z1-830-dump.html

DumpTOP의 Oracle인증 1z1-830덤프와 만나면Oracle인증 1z1-830시험에 두려움을 느끼지 않으셔도 됩니다, Credit-card을 거쳐서 지불하시면 저희측에서 1z1-830 덤프를 보내드리지 않을시 Credit-card에 환불신청하실수 있습니다, DumpTOP 1z1-830최신버전 공부자료제품에 대하여 아주 자신이 있습니다, 최근 유행하는Oracle인증 1z1-830 IT인증시험에 도전해볼 생각은 없으신지요, 1z1-830시험덤프는 최상의 현명한 선택, Oracle 1z1-830 100％시험패스 덤프자료 엄청난 학원수강료 필요없이 20~30시간의 독학만으로도 시험패스가 충분합니다.

일꾼들이 오늘 일당은 깎이지 않는다면 나쁘진 않구나, 숙소는?저희 취재 오면 매번 가는 곳 있어요, DumpTOP의 Oracle인증 1z1-830덤프와 만나면Oracle인증 1z1-830시험에 두려움을 느끼지 않으셔도 됩니다.

시험패스에 유효한 1z1-830 100％시험패스 덤프자료 덤프자료

Credit-card을 거쳐서 지불하시면 저희측에서 1z1-830 덤프를 보내드리지 않을시 Credit-card에 환불신청하실수 있습니다, DumpTOP제품에 대하여 아주 자신이 있습니다, 최근 유행하는Oracle인증 1z1-830 IT인증시험에 도전해볼 생각은 없으신지요?

1z1-830시험덤프는 최상의 현명한 선택.

Matt Walker Matt Walker

Biography

ABOUT

Pages

Contact