Oracle Java SE 21 Developer Professional : 1z1-830

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?

A) execService.execute(task2);
B) execService.execute(task1);
C) execService.submit(task1);
D) execService.call(task1);
E) execService.run(task2);
F) execService.submit(task2);
G) execService.call(task2);
H) execService.run(task1);

2. Which methods compile?

A) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
B) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
C) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
D) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}

3. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var b = 2, c = 3.0;
B) var f = { 6 };
C) var a = 1;(Valid: var correctly infers int)
D) var d[] = new int[4];
E) var e;
F) var h = (g = 7);

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

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

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

Solutions: