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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?

A) [,hello,h i]
B) [,hello,hi]
C) [ ,hello,h i]
D) [ , hello ,hi ]

2. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

A) Compilation fails.
B) abc
C) ABC
D) An exception is thrown.

3. Which of the following doesnotexist?

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

4. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) default
B) static
C) Compilation fails
D) nothing

5. Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A) A a = new Test.A();
B) A a = new A();
C) B b = new Test().new B();
D) B b = new Test.B();
E) B b = new B();
F) A a = new Test().new A();

Solutions: