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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following can be the body of a lambda expression?

A) A statement block
B) Two statements
C) Two expressions
D) An expression and a statement
E) None of the above

2. Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A) An UnsupportedOperationException is thrown
B) An IndexOutOfBoundsException is thrown
C) [d, b]
D) [d]
E) [c, b]
F) [a, b]

3. Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)

A) ExtendingClass
B) WithStaticField
C) WithInstanceField
D) ImplementingInterface

4. Which of the following statements are correct?

A) You can use 'private' access modifier with all kinds of classes
B) None
C) You can use 'public' access modifier with all kinds of classes
D) You can use 'protected' access modifier with all kinds of classes
E) You can use 'final' modifier with all kinds of classes

5. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) An ArrayIndexOutOfBoundsException is thrown at runtime.
B) Chanel
C) Compilation fails.
D) Chanel Dior Louis Vuitton

Solutions: