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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) Compilation fails.
B) It throws an exception.
C) 10
D) _$

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

3. Which three of the following are correct about the Java module system?

A) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
B) The unnamed module can only access packages defined in the unnamed module.
C) The unnamed module exports all of its packages.
D) If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
E) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
F) Code in an explicitly named module can access types in the unnamed module.

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

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

5. 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) Compilation fails
B) 42 42
C) 666 666
D) 666 42

Solutions: