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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}

A) stringBuilder4
B) stringBuilder3
C) stringBuilder2
D) None of them
E) stringBuilder1

2. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

A) 14
B) 12
C) 10
D) 11

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

4. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = new Stream();
B) Stream stream = Stream.of();
C) Stream<String> stream = Stream.builder().add("a").build();
D) Stream stream = Stream.empty();
E) Stream stream = Stream.generate(() -> "a");
F) Stream stream = Stream.ofNullable("a");

5. Given a properties file on the classpath named Person.properties with the content:
ini
name=James
And:
java
public class Person extends ListResourceBundle {
protected Object[][] getContents() {
return new Object[][]{
{"name", "Jeanne"}
};
}
}
And:
java
public class Test {
public static void main(String[] args) {
ResourceBundle bundle = ResourceBundle.getBundle("Person");
String name = bundle.getString("name");
System.out.println(name);
}
}
What is the given program's output?

A) JamesJeanne
B) MissingResourceException
C) Jeanne
D) Compilation fails
E) James
F) JeanneJames

Solutions: