Jon Bell Jon Bell's Profile Page

Jon Bell Jon Bell

0 Course Enrolled • 0 Course Completed

Biography

1z1-830試験資料 & 1z1-830トレーニング

Topexamの1z1-830問題集は素晴らしい参考資料です。この問題集は絶対あなたがずっと探しているものです。これは受験生の皆さんのために特別に作成し出された試験参考書です。この参考書は短い時間で試験に十分に準備させ、そして楽に試験に合格させます。試験のためにあまりの時間と精力を無駄にしたくないなら、Topexamの1z1-830問題集は間違いなくあなたに最もふさわしい選択です。この資料を使用すると、あなたの学習効率を向上させ、多くの時間を節約することができます。

1z1-830トレント準備には、さまざまな資格試験の実際の質問とシミュレーションの質問が含まれています。効率的に勉強する価値があります。時間は絶え間ない発展であり、命題の専門家は命題の社会変化傾向の進行に応じて実際の1z1-830試験の質問を継続的に設定し、ホットな問題と政策変更を意識的に強調します。命題論文の方向性をよりよく把握できるようにするため、1z1-830の学習問題では、最新のコンテンツに焦点を当て、1z1-830試験に合格するのに役立ちます。

>> 1z1-830試験資料 <<

1z1-830トレーニング、1z1-830受験記

Topexamは、認定資格を取得し、社内でより重要な地位を獲得することで、希望するより高い給与を達成するための最良かつ最速の方法を提供します。低品質の1z1-830試験資料が会社に不信感をもたらす可能性があるという信念があるためです。 1z1-830学習の質問は、メリットに満ちた否定できない優れた製品です。したがって、1z1-830試験の資料は、私たち自身のイメージを高めることができます。一方、当社の1z1-830試験の教材は、複雑な知識の本質をつかむのに役立つ非常に効果的です。

Oracle Java SE 21 Developer Professional 認定 1z1-830 試験問題 (Q53-Q58):

質問 # 53
Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A. [d]
B. [c, b]
C. An IndexOutOfBoundsException is thrown
D. [d, b]
E. An UnsupportedOperationException is thrown
F. [a, b]

正解：B

解説：
In this code, two lists l1 and l2 are created and initialized as follows:
* l1 Initialization:
* Created using List.of("a", "b"), which returns an immutable list containing the elements "a" and
"b".
* Wrapped with new ArrayList<>(...) to create a mutable ArrayList containing the same elements.
* l2 Initialization:
* Created using Collections.singletonList("c"), which returns an immutable list containing the single element "c".
* Wrapped with new ArrayList<>(...) to create a mutable ArrayList containing the same element.
State of Lists Before Collections.copy:
* l1: ["a", "b"]
* l2: ["c"]
Collections.copy(l1, l2):
The Collections.copy method copies elements from the source list (l2) into the destination list (l1). The destination list must have at least as many elements as the source list; otherwise, an IndexOutOfBoundsException is thrown.
In this case, l1 has two elements, and l2 has one element, so the copy operation is valid. After copying, the first element of l1 is replaced with the first element of l2:
* l1 after copy: ["c", "b"]
l2.set(0, "d"):
This line sets the first element of l2 to "d".
* l2 after set: ["d"]
Final State of Lists:
* l1: ["c", "b"]
* l2: ["d"]
The System.out.println(l1); statement outputs the current state of l1, which is ["c", "b"]. Therefore, the correct answer is C: [c, b].

質問 # 54
Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?

A. It throws an exception at runtime.
B. It does not compile.
C. It compiles.

正解：B

解説：
In the provided code, the class ThisCalls has two constructors:
* No-Argument Constructor (ThisCalls()):
* This constructor calls the boolean constructor with this(true);.
* Boolean Constructor (ThisCalls(boolean flag)):
* This constructor attempts to call the no-argument constructor with this();.
This setup creates a circular call between the two constructors:
* The no-argument constructor calls the boolean constructor.
* The boolean constructor calls the no-argument constructor.
Such a circular constructor invocation leads to a compile-time error in Java, specifically "recursiveconstructor invocation." The Java Language Specification (JLS) states:
"It is a compile-time error for a constructor to directly or indirectly invoke itself through a series of one or more explicit constructor invocations involving this." Therefore, the code will not compile due to this recursive constructor invocation.

質問 # 55
Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A. A a = new A();
B. B b = new Test().new B();
C. B b = new B();
D. A a = new Test().new A();
E. A a = new Test.A();
F. B b = new Test.B();

正解：C、D、F

解説：
In the provided code, we have two inner classes within the Test class:
* Class A:
* An inner (non-static) class.
* Instances of A are associated with an instance of the enclosing Test class.
* Class B:
* A static nested class.
* Instances of B are not associated with any instance of the enclosing Test class and can be instantiated without an instance of Test.
Evaluation of Statements:
A: A a = new A();
* Invalid.Since A is a non-static inner class, it requires an instance of the enclosing class Test to be instantiated. Attempting to instantiate A without an instance of Test will result in a compilation error.
B: B b = new Test.B();
* Valid.B is a static nested class and can be instantiated without an instance of Test. This syntax is correct.
C: A a = new Test.A();
* Invalid.Even though A is referenced through Test, it is a non-static inner class and requires an instance of Test for instantiation. This will result in a compilation error.
D: B b = new Test().new B();
* Invalid.While this syntax is used for instantiating non-static inner classes, B is a static nested class and does not require an instance of Test. This will result in a compilation error.
E: B b = new B();
* Valid.Since B is a static nested class, it can be instantiated directly without referencing the enclosing class.
F: A a = new Test().new A();
* Valid.This is the correct syntax for instantiating a non-static inner class. An instance of Test is created, and then an instance of A is created associated with that Test instance.
Therefore, the valid statements are B, E, and F.

質問 # 56
Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?

A. fos.write("Today");
B. oos.write("Today");
C. oos.writeObject("Today");
D. fos.writeObject("Today");

正解：C

解説：
In Java, FileOutputStream and ObjectOutputStream are used for writing data to files, but they have different purposes and methods. Let's analyze each statement:
* fos.write("Today");
The FileOutputStream class is designed to write raw byte streams to files. The write method in FileOutputStream expects a parameter of type int or byte[]. Since "Today" is a String, passing it directly to fos.
write("Today"); will cause a compilation error because there is no write method in FileOutputStream that accepts a String parameter.
* fos.writeObject("Today");
The FileOutputStream class does not have a method named writeObject. The writeObject method is specific to ObjectOutputStream. Therefore, attempting to call fos.writeObject("Today"); will result in a compilation error.
* oos.write("Today");
The ObjectOutputStream class is used to write objects to an output stream. However, it does not have a write method that accepts a String parameter. The available write methods in ObjectOutputStream are for writing primitive data types and objects. Therefore, oos.write("Today"); will cause a compilation error.
* oos.writeObject("Today");
The ObjectOutputStream class provides the writeObject method, which is used to serialize objects and write them to the output stream. Since String implements the Serializable interface, "Today" can be serialized.
Therefore, oos.writeObject("Today"); is valid and compiles successfully.
In summary, the only statement that compiles without errors is oos.writeObject("Today");.
References:
* Java SE 21 & JDK 21 - ObjectOutputStream
* Java SE 21 & JDK 21 - FileOutputStream

質問 # 57
Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?

A. Only if assertions are disabled and the input argument is null
B. A NullPointerException is never thrown
C. Only if assertions are enabled and the input argument isn't null
D. Only if assertions are enabled and the input argument is null
E. Only if assertions are disabled and the input argument isn't null

正解：A

解説：
In the verifyNotNull method, the following operations are performed:
* Assertion to Enable Assertions:
java
boolean enabled = false;
assert enabled = true;
assert enabled;
* The variable enabled is initially set to false.
* The first assertion assert enabled = true; assigns true to enabled if assertions are enabled. If assertions are disabled, this assignment does not occur.
* The second assertion assert enabled; checks if enabled is true. If assertions are enabled and the previous assignment occurred, this assertion passes. If assertions are disabled, this assertion is ignored.
* Dereferencing the input Object:
java
System.out.println(input.toString());
* This line attempts to call the toString() method on the input object. If input is null, this will throw a NullPointerException.
* Assertion to Check input for null:
java
assert input != null;
* This assertion checks that input is not null. If input is null and assertions are enabled, this assertion will fail, throwing an AssertionError. If assertions are disabled, this assertion is ignored.
Analysis:
* If Assertions Are Enabled:
* The enabled variable is set to true by the first assertion, and the second assertion passes.
* If input is null, calling input.toString() will throw a NullPointerException before the final assertion is reached.
* If input is not null, input.toString() executes without issue, and the final assertion assert input != null; passes.
* If Assertions Are Disabled:
* The enabled variable remains false, but the assertions are ignored, so this has no effect.
* If input is null, calling input.toString() will throw a NullPointerException.
* If input is not null, input.toString() executes without issue.
Conclusion:
A NullPointerException is thrown if input is null, regardless of whether assertions are enabled or disabled.
Therefore, the correct answer is:
C: Only if assertions are disabled and the input argument is null

質問 # 58
......

Oracleの1z1-830試験は大変です。あなたは復習資料に悩んでいるかもしれません。我々Topexamの提供するOracleの1z1-830ソフトを利用して自分の圧力を減少しましょう。我々のチームは複雑な問題集を整理するに通じて、毎年の試験の問題を分析して最高のOracleの1z1-830ソフトを作成します。今まで、我々は更新を努力しています。ご購入した後の一年間で、Oracleの1z1-830試験が更新されたら、あなたを理解させます。

1z1-830トレーニング: https://www.topexam.jp/1z1-830_shiken.html

Oracle 1z1-830試験資料こんな保障がありますから、心配する必要は全然ないですよ、もしあなたはまだ合格のためにOracle 1z1-830に大量の貴重な時間とエネルギーをかかって一生懸命準備し、Oracle 1z1-830「Java SE 21 Developer Professional」認証試験に合格するの近道が分からなくって、今はTopexamが有効なOracle 1z1-830認定試験の合格の方法を提供して、君は半分の労力で倍の成果を取るの与えています、たぶん、あなたはいくつかの時間とエネルギーで1z1-830試験準備をしますが、それは問題ではありません、Oracle 1z1-830試験資料もし運が良くないとき、失敗したら、お金を返してあなたの経済損失を減らします。

彼は人種の異つて居る自分の顏を見上げたが驚きもせず怪し氣な英語で、島から、シ1z1-830ヽリー島からです、僕が困らないようにと日本語も必死で勉強し、できる限り日本語での会話を心がけてくれた、こんな保障がありますから、心配する必要は全然ないですよ。

有難いOracle 1z1-830試験資料 & 合格スムーズ1z1-830トレーニング | 大人気1z1-830受験記

もしあなたはまだ合格のためにOracle 1z1-830に大量の貴重な時間とエネルギーをかかって一生懸命準備し、Oracle 1z1-830「Java SE 21 Developer Professional」認証試験に合格するの近道が分からなくって、今はTopexamが有効なOracle 1z1-830認定試験の合格の方法を提供して、君は半分の労力で倍の成果を取るの与えています。

たぶん、あなたはいくつかの時間とエネルギーで1z1-830試験準備をしますが、それは問題ではありません、もし運が良くないとき、失敗したら、お金を返してあなたの経済損失を減らします、当社の製品は、必要な学習教材を提供します。

Jon Bell Jon Bell

Biography

Company

Resources

Support

Jon Bell Jon Bell

Biography

Follow us

Company

Resources

Support