1z1-819無料問題集「Oracle Java SE 11 Developer」

質問 1

Given this enum declaration:

Examine this code:
System.out.println(Alphabet.getFirstLetter());
What code should be written at line 3 to make this code print A?

（A）static String getFirstLetter() { return Alphabet.values()[1].toString(); }

（B）String getFirstLetter() { return A.toString(); }

（C）static String getFirstLetter() { return A.toString(); }

（D）final String getFirstLetter() { return A.toString(); }

正解：C 解答を投票する

質問 2

Given the code fragment:

What is the result?

（A）13

（B）12

（C）123

（D）23

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)

質問 3

Which three annotation uses are valid? (Choose three.)

（A）var obj = new @Interned MyObject();

（B）Function<String, String> func = (@NonNull x) -> x.toUpperCase();

（C）var myString = (@NonNull String) str;

（D）Function<String, String> func = (var @NonNull x) -> x.toUpperCase();

（E）Function<String, String> func = (@NonNull var x) -> x.toUpperCase();

（F）var v = "Hello" + (@Interned) "World"

正解：A、B、D 解答を投票する

質問 4

Given:

Which two lines cause compilation errors? (Choose two.)

（A）line 7

（B）line 8

（C）line 9

（D）line 12

（E）line 6

正解：A、E 解答を投票する

質問 5

Given:

Which code, when inserted at one or more marked positions, would allow classes B and C to compile?

（A）@Override // position 2public void z() { } // position 3

（B）@Override // position 3void x () {} // position 3@Override // position 3public void z() { } // position 3

（C）public void z() { } // position 3

（D）implements A // position 1@Override // position 2

正解：A 解答を投票する

質問 6

Given:

You want to examine the items list it contains an item for which the variable count is below zero.
Which code fragment at line 1 accomplish this?

（A）If (items.stream () .filter (i -> count < 0) . findAny () ) {

（B）If (items.stream () .anymatch (i -> count < 0) < 0) ) {

（C）If (items.stream () .allmatch (i -> count < 0) < 0) ) {

（D）If (items.stream () .filter (i -> count < 0) . findFirst () ) {

正解：D 解答を投票する

質問 7

Which code fragment added to line 1 enables the code to compile and print Hello Joe?

（A）

（B）

（C）

（D）

正解：B 解答を投票する

質問 8

Given the code fragment:

You want to examine whether path is a directory.
Which code inserted on line 1 will accomplish this?

（A）BasicFileAttributes attributes = Files isDirectory (path);

（B）BasicFileAttributes attributes = Files, readAttributes (path, FileAttributes, class);

（C）BasicFileAttributes attributes = Files.readAttributes(path, BasicFileAttributes.class

（D）BasicFileAttributes attributes =Files.getAttribute (path, ''insdirectory'');

正解：B 解答を投票する

質問 9

Given:

What code must you insert on Line 1 to enable the code to print Hello world?

（A）Hello myH = new Hello();
Hello.Greeting myG = myH.new Greeting();
myG.sayHi();

（B）Hello myH = new Hello();
Hello.Greeting myG = myH.new Hello.Greeting();
myG.sayHi();

（C）Hello myH = new Hello(); Greeting myG = new Greeting(); myG.sayHi ();

（D）Hello.Greeting myG = new Hello.Greeting() myG.sayHi();

正解：A 解答を投票する

質問 10

Given:

What is the result?

（A）Keys: 4 Values: 4 Map: 4

（B）Keys: 0 Values: 0 Map:

（C）Keys: 0 Values: 0 Map: 0

（D）Keys: 4 Values: 4 Map: 0

（E）The compilation fails.

正解：A 解答を投票する

質問 11

Given:

What action ensures successful compilation?

（A）Replace enum Color with public enum Color.

（B）Replace enum Color implements Serializable with public enum Color.

（C）Replace int c; with private final int c;.

（D）Replace int c; with private int c;.

（E）Replace public Color(int c) with private Color(int c).

正解：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 12

Given:

And the command:
java Main Helloworld
What is the result ?

（A）Input: Helloworld Echo: Helloworld

（B）Input:
Echo: Helloworld

（C）Input: Echo:

（D）Input:
Then block until any input comes from System.in.

（E）A NullPointerException is thrown at run time.

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)

質問 13

Given:

If file "App.config" is not found, what is the result?

（A）Configuration is OK

（B）nothing

（C）Exception in thread "main" java.lang.Error:Fatal Error: Configuration File, App.config, is missing.

（D）The compilation fails.

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)

質問 14

Given:

What is the result?

（A）3

（B）5

（C）11

（D）23

（E）25

正解：C 解答を投票する

質問 15

Given:

Which two are correct? (Choose two.)

（A）Replacing forEach() with forEachOrdered(), the program prints 1 2 3 4 5.

（B）Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5, but the order is unpredictable.

（C）The program prints 1 4 2 3, but the order is unpredictable.

（D）Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5.

（E）The output will be exactly 2 1 3 4 5.

正解：A、C 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 16

Given:

and
checkQuality(QUALITY.A);
and

Which code fragment can be inserted into the switch statement to print Best?

（A）A.toString()

（B）QUALITY.A

（C）QUALITY.A.ValueOf()

（D）A

正解：D 解答を投票する

質問 17

Given:

executed using this command:
java Myclass My Car is red
What is the output of this class?

（A）Myclass--Car--red

（B）Car--red--My

（C）java--Myclass--My

（D）My--Car--is

（E）My--is--java

正解：B 解答を投票する

質問 18

Given:

What is the result?

（A）ab action

（B）The compilation fails on line 1.

（C）The compilation fails on line 2.

（D）a action

（E）An exception is thrown at run time.

正解：D 解答を投票する

質問 19

Why does this compilation fail?

（A）The method Y. print (object...) cannot override the final method x.print (object....).

（B）The method Y. print (object) does not call the method super.print (object)

（C）The method x. print (object) is not accessible to Y.

（D）The method print (object) and the method print (object...) are duplicates of each other.

（E）In method x. print (Collection), system. Out :: prints is an invalid Java identifier.

正解：D 解答を投票する

1z1-819 無料問題集「Oracle Java SE 11 Developer」

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