Oracle Java SE 1z1-830

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1
Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?

A. format3
B. format4
C. format2
D. format1

Question #2
Which two of the following aren't the correct ways to create a Stream?

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

Question #3
Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

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

Question #4
Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?

A. File f2.txt exists while file f1.txt doesn't
B. An exception is always thrown
C. File f1.txt exists while file f2.txt doesn't
D. Neither files f1.txt nor f2.txt exist
E. Both files f1.txt and f2.txt exist

Question #5
Given:
java
var lyrics = """
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
""";
for ( int i = 0, int j = 3; i < j; i++ ) {
System.out.println( lyrics.lines()
.toList()
.get( i ) );
}
What is printed?

A. Nothing
B. vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
C. An exception is thrown at runtime.
D. Compilation fails.

Solutions: