Oracle 1z0-830

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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1
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 Dior Louis Vuitton
C. Chanel
D. Compilation fails.

Question #2
Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?

A. Line 2 and line 3
B. Line 2 only
C. The program successfully compiles
D. Line 3 only
E. Line 1 and line 3
F. Line 1 only
G. Line 1 and line 2

Question #3
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. Nothing
B. Compilation fails at line n1.
C. Compilation fails at line n2.
D. markdown
Inner class:
------------
Outer field
E. An exception is thrown at runtime.

Question #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. None of the above
B. A
C. D
D. C
E. B
F. E

Question #5
Which of the following doesnotexist?

A. They all exist.
B. LongSupplier
C. BiSupplier<T, U, R>
D. DoubleSupplier
E. BooleanSupplier
F. Supplier<T>

Solutions: