Oracle 1z1-830 Exam : Java SE 21 Developer Professional

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var f = { 6 };
B) var b = 2, c = 3.0;
C) var h = (g = 7);
D) var d[] = new int[4];
E) var a = 1;(Valid: var correctly infers int)
F) var e;

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

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

3. Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?

A) 2
B) 1
C) 0
D) It throws an exception at runtime.
E) Compilation fails.

4. Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?

A) D
B) None of the above
C) C
D) A
E) E
F) B

5. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

A) US-UK
B) =US-UK
C) -US=UK
D) US=UK
E) An exception is thrown.
F) Compilation fails.

Solutions: