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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A. bca
B. acb
C. abc
D. cacb
E. bac
F. cbca
G. cba

Question 2

Which three of the following are correct about the Java module system?

A. The unnamed module exports all of its packages.
B. The unnamed module can only access packages defined in the unnamed module.
C. If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
D. Code in an explicitly named module can access types in the unnamed module.
E. We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
F. If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.

Question 3

Which of the following java.io.Console methods doesnotexist?

A. read()
B. readPassword()
C. readPassword(String fmt, Object... args)
D. readLine()
E. readLine(String fmt, Object... args)
F. reader()

Question 4

Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A. 0 1 2 3
B. Compilation fails.
C. 1 2 3 4
D. 0 1 2
E. 1 2 3
F. An exception is thrown.

Question 5

Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A. UNITED-STATES
B. United-STATES
C. -UnitedSTATES
D. -UNITEDSTATES
E. UnitedStates
F. United-States
G. -UnitedStates

Solutions: