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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
B) var concurrentHashMap = new ConcurrentHashMap(42, 10);
C) var concurrentHashMap = new ConcurrentHashMap();
D) None of the suggestions.
E) var concurrentHashMap = new ConcurrentHashMap(42);

3. Which of the following can be the body of a lambda expression?

A) None of the above
B) Two expressions
C) Two statements
D) A statement block
E) An expression and a statement

4. What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

A) 42 42
B) Compilation fails
C) 666 666
D) 666 42

5. Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)

A) WithInstanceField
B) WithStaticField
C) ImplementingInterface
D) ExtendingClass

Solutions: