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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.ofNullable("a");
B) Stream<String> stream = Stream.builder().add("a").build();
C) Stream stream = Stream.empty();
D) Stream stream = Stream.generate(() -> "a");
E) Stream stream = Stream.of();
F) Stream stream = new Stream();

2. Which methods compile?

A) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
B) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
C) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
D) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp

3. Given:
java
List<String> frenchAuthors = new ArrayList<>();
frenchAuthors.add("Victor Hugo");
frenchAuthors.add("Gustave Flaubert");
Which compiles?

A) Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
java
authorsMap1.put("FR", frenchAuthors);
B) Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
C) Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
D) Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);
E) var authorsMap3 = new HashMap<>();
java
authorsMap3.put("FR", frenchAuthors);

4. Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

A) java
String colors = """
red \t
green\t
blue \t
""";
B) None of the propositions
C) java
String colors = """
red \
green\
blue \
""";
D) java
String colors = """
red \s
green\s
blue \s
""";
E) java
String colors = """
red
green
blue
""";

5. You are working on a module named perfumery.shop that depends on another module named perfumery.
provider.
The perfumery.shop module should also make its package perfumery.shop.eaudeparfum available to other modules.
Which of the following is the correct file to declare the perfumery.shop module?

A) File name: module-info.java
java
module perfumery.shop {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum;
}
B) File name: module-info.perfumery.shop.java
java
module perfumery.shop {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum.*;
}
C) File name: module.java
java
module shop.perfumery {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum;
}

Solutions: