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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A. An exception is thrown at runtime.
B. Compilation fails at line n1.
C. Nothing
D. Compilation fails at line n2.
E. markdown
Inner class:
------------
Outer field

Question 2

Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?

A. truefalsetrue
B. truetruetrue
C. Compilation fails
D. truetruefalse
E. falsetruetrue

Question 3

Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?

A. false
B. true
C. 3.3
D. An exception is thrown at runtime
E. Compilation fails

Question 4

Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A. Iphone15 class does not compile
B. SmartPhone interface does not compile
C. Everything compiles
D. An exception is thrown at running Iphone15.ring();

Question 5

What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A. Compilation error
B. C
C. home
D. C:
E. IllegalArgumentException

Solutions: