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Oracle 1z0-809 試験概要:

Oracle 1z0-809 試験シラバストピック:

1z0-809試験に関するQ&Aまとめ

Oracle Java SE 8 Programmer II 認定 1z0-809 試験問題：

問題 #1

Given the structure of the Student table:
Student (id INTEGER, name VARCHAR)
Given the records from the STUDENT table:

Given the code fragment:

Assume that:
What is the result?

A. The program prints Status: true and two records are deleted from the Student table.
B. The program prints Status: false and two records are deleted from the Student table.
C. The program prints Status: false but the records from the Student table are not deleted.
D. A SQLException is thrown at runtime.

問題 #2

Given the code fragment:

and the information:
* The required database driver is configured in the classpath.
* The appropriate database is accessible with the dbURL, username, and passWord exists.
What is the result?

A. The program prints Connection Established.
B. A ClassNotFoundException is thrown at runtime.
C. The program prints nothing.
D. A SQLException is thrown at runtime.

問題 #3

Given:

From what threading problem does the program suffer?

A. race condition
B. livelock
C. starvation
D. deadlock

問題 #4

Given the code fragment:
public class FileThread implements Runnable {
String fName;
public FileThread(String fName) { this.fName = fName; }
public void run () System.out.println(fName);}
public static void main (String[] args) throws IOException, InterruptedException { ExecutorService executor = Executors.newCachedThreadPool(); Stream<Path> listOfFiles = Files.walk(Paths.get("Java Projects")); listOfFiles.forEach(line -> { executor.execute(new FileThread(line.getFileName().toString())); // line n1
});
executor.shutdown();
executor.awaitTermination(5, TimeUnit.DAYS);//
line n2
}
}
The Java Projects directory exists and contains a list of files.
What is the result?

A. A compilation error occurs at line n1.
B. The program throws a runtime exception at line n2.
C. The program prints files names sequentially.
D. The program prints files names concurrently.

問題 #5

Given:
class Student {
String course, name, city;
public Student (String name, String course, String city) {
this.course = course; this.name = name; this.city = city;
}
public String toString() {
return course + ":" + name + ":" + city;
}
and the code fragment:
List<Student> stds = Arrays.asList(
new Student ("Jessy", "Java ME", "Chicago"),
new Student ("Helen", "Java EE", "Houston"),
new Student ("Mark", "Java ME", "Chicago"));
stds.stream()
.collect(Collectors.groupingBy(Student::getCourse))
.forEach(src, res) -> System.out.println(scr));
What is the result?

A. [Java EE: Helen:Houston][Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
B. A compilation error occurs.
C. Java EEJava ME
D. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago][Java EE: Helen:Houston]

解説：