1Z0-819無料問題集「Oracle Java SE 11 Developer」

質問 1

Given:

Which two statements can be added at line 1 in Bar to successfully compile it? (Choose two.)

（A）public ArrayList<Integer> foo(Set<String> m) { ... }

（B）public List<Integer> foo(Set<String> m) { ... }

（C）public ArrayList<Number> foo(Set<CharSequence> m) { ... }

（D）public List<Object> foo(Set<CharSequence> m) { ... }

（E）public List<Integer> foo(Set<CharSequence> m) { ... }

（F）public List<Integer> foo(TreeSet<String> m) { ... }

正解：C、F 解答を投票する

質問 2

Given:

After which line can we insert assert i < 0 || values[i] <= values[i + 1]; to verify that the values array is partially sorted?

（A）after line 6

（B）after line 8

（C）after line 10

（D）after line 5

正解：A 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 3

Given:

What is the result?

（A）Ans:

（B）A java:util. NsuchElementException is thrown at runtime

（C）Ans: a

（D）The compilation fails

正解：B 解答を投票する

質問 4

What change will cause the code to compile successfully?

（A）Insert PriceChecker <Plushy extends Products> prod on line 1.

（B）Insert PriceChecker <> prod on line 1.

（C）Insert PriceChecker (?) prod on line 1.

（D）Insert PriceChecker <Electronics> prod on line 1.

正解：C 解答を投票する

質問 5

And the code fragment:

Which situation will occur on code fragment execution?

（A）Livelock

（B）Race Condition

（C）Deadlock

（D）Starvation

正解：D 解答を投票する

質問 6

Given the code fragment:

What is the result?

（A）False

（B）A java.lang.NullPointerException is thrown.

（C）True

（D）A java.lang, UnsupportedOperationException is thrown.

正解：D 解答を投票する

質問 7

Given:

and the code fragment:
Which two Map objects group all employees with a salary greater than 30 by neighborhood? (Choose two.)

（A）

（B）

（C）

（D）

（E）

正解：C 解答を投票する

質問 8

Given:

Which two interfaces can be used in lambda expressions? (Choose two.)

（A）MyInterface5

（B）MyInterface2

（C）MyInterface4

（D）MyInterface1

（E）MyInterface3

正解：A、B 解答を投票する

質問 9

Given:

What is the result?

（A）1.0

（B）2.0

（C）The program pints nothing.

（D）3.0

（E）An exception is thrown at runtime.

正解：D 解答を投票する

質問 10

Given:

What code inserted into class C would allow it to compile?

（A）void x() { super.y(); }
public void z() { }

（B）public void x() { }
public void z() { }

（C）public void x() { }
protected void y() { super.y(); }
public void z() { }

（D）void x() { }
public void z() { }

（E）void x() { }
public void y() { }
public void z() { }

正解：B 解答を投票する

質問 11

Which describes an aspect of Java that contributes to high performance?

（A）Java automatically parallelizes code execution.

（B）Java has a library of built-in functions that can be used to enable pipeline burst execution.

（C）Java monitors and optimizes code that is frequently executed.

（D）Java prioritizes garbage collection.

正解：C 解答を投票する

質問 12

Given:

What is the result?

（A）[A, B, C]
[A, B, C]

（B）On line 9, an exception is thrown at run time.

（C）[A, B, C]
[A, B]

（D）[A, B, C]
followed by an exception thrown on line 11.

正解：A 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 13

Given the code fragment:

What is the output?

（A）An exception is thrown at runtime

（B）41 def 42

（C）Def 42

（D）Null

正解：D 解答を投票する

質問 14

Given the code fragment:

Which two statement inserted independently at line 1 enable this code to print PRRT?

（A）j--;

（B）i-;

（C）continue a;

（D）break a ;

（E）break b;

（F）continue b;

正解：D 解答を投票する

質問 15

Given:

Which three classes successfully override printOne()? (Choose three.)

（A）Option E

（B）Option D

（C）Option B

（D）Option C

（E）Option A

（F）Option F

正解：B、D、E 解答を投票する

質問 16

Given:

What is the result?

（A）Orange Juice Apple Pie Lemmon Ice Raspberry Tart

（B）The program prints nothing.

（C）Orange Juice

（D）The compilation fails.

正解：A 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 17

Your organization makes mlib.jar available to your cloud customers. While working on a code cleanup project for mlib.jar, you see this method by customers:

What security measures should be added to this method so that it meets the requirements for a customer accessible method?

（A）Make enableService private.

（B）Enclose the call to new Socket In an AccessController.doPrivileged block.

（C）Create a method that validates the hostName and portNumber parameters before opening the socket.

（D）

正解：B 解答を投票する

質問 18

Which two statements set the default locale used for formatting numbers, currency, and percentages? (Choose two.)

（A）Locale.setDefault(Locale.Category.FORMAT, "zh-CN");

（B）Locale.setDefault("en_CA");

（C）Locale.setDefault(Locale.SIMPLIFIED_CHINESE);

（D）Locale.setDefault("es", Locale.US);

（E）Locale.setDefault(Locale.Category.FORMAT, Locale.CANADA_FRENCH);

正解：B、E 解答を投票する

質問 19

var numbers = List.of(0,1,2,3,4,5,6,7,8,9);
You want to calculate the average of numbers. Which two codes will accomplish this? (Choose two.)

（A）double avg = numbers.parallelStream().mapToInt (m -> m).average().getAsDouble ();

（B）double avg = numbers.stream().mapToInt (i -> i).average().parallel();

（C）double avg = numbers.stream().parallel().averagingDouble(a -> a);

（D）double avg = numbers.stream().collect(Collectors.averagingDouble(n -> n));

（E）double avg = numbers.stream().average().getAsDouble();

正解：A、E 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

質問 20

Given:

What is the result?

（A）234

（B）2134

（C）2143

（D）214

正解：D 解答を投票する

解説: (JPNTest メンバーにのみ表示されます)

1Z0-819 無料問題集「Oracle Java SE 11 Developer」

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