Try Oracle : 1z1-830 practice torrent pass for sure

Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

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

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

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

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

4. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) C
B) IllegalArgumentException
C) C:
D) home
E) Compilation error

5. Given:
java
DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();
stats1.accept(4.5);
stats1.accept(6.0);
DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();
stats2.accept(3.0);
stats2.accept(8.5);
stats1.combine(stats2);
System.out.println("Sum: " + stats1.getSum() + ", Max: " + stats1.getMax() + ", Avg: " + stats1.getAverage()); What is printed?

A) Compilation fails.
B) Sum: 22.0, Max: 8.5, Avg: 5.5
C) An exception is thrown at runtime.
D) Sum: 22.0, Max: 8.5, Avg: 5.0

Solutions: