Oracle Java SE 8 Programmer II - 1z0-809 模擬練習

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トータル 209 問
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Given:

and the code fragment:

What is the result?

正解: C
Given:
public class Counter {
public static void main (String[ ] args) {
int a = 10;
int b = -1;
assert (b >=1) : "Invalid Denominator";
int # = a / b;
System.out.println (c);
}
}
What is the result of running the code with the -ea option?

正解: B
Given:
Message.properties:
msg = Welcome!
Message_fr_FR.properties:
msg = Bienvenue!
Given the code fragment:
// line n1
Locale.setDefault(locale);
ResourceBundle bundle = ResourceBundle.getBundle("Message");
System.out.print(bundle.getString("msg"));
Which two code fragments, when inserted at line n1 independently, enable to print Bienvenue!?

正解: C,D
Given:
class UserException extends Exception { }
class AgeOutOfLimitException extends UserException { }
and the code fragment:
class App {
public void doRegister(String name, int age)
throws UserException, AgeOutOfLimitException {
if (name.length () <= 60) {
throw new UserException ();
} else if (age > 60) {
throw new AgeOutOfLimitException ();
} else {
System.out.println("User is registered.");
}
}
public static void main(String[ ] args) throws UserException {
App t = new App ();
t.doRegister("Mathew", 60);
}
}
What is the result?

正解: D
Given the EMPLOYEE table;

Given the code fragment:

Assuming the database supports scrolling and updating, what is the result?

正解: A
Given:
Book.java:
public class Book {
private String read(String bname) { return "Read" + bname }
}
EBook.java:
public class EBook extends Book {
public class String read (String url) { return "View" + url }
}
Test.java:
public class Test {
public static void main (String[] args) {
Book b1 = new Book();
b1.read("Java Programing");
Book b2 = new EBook();
b2.read("http://ebook.com/ebook");
}
}
What is the result?

正解: A
Given:
class Book {
int id;
String name;
public Book (int id, String name) {
this.id = id;
this.name = name;
}
public boolean equals (Object obj) { //line n1
boolean output = false;
Book b = (Book) obj;
if (this.name.equals(b name))}
output = true;
}
return output;
}
}
and the code fragment:
Book b1 = new Book (101, "Java Programing");
Book b2 = new Book (102, "Java Programing");
System.out.println (b1.equals(b2)); //line n2
Which statement is true?

正解: A
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?

正解: D
Given:

and the code fragment:

Which modification enables the code fragment to print Speaker?

正解: C
Given that these files exist and are accessible:
/sports/info.txt
/sports/cricket/players.txt
/sports/cricket/data/ODI.txt
and given the code fragment:
int maxDepth =2;
Stream<Path> paths = Files.find(Paths.get("/sports"),
maxDepth,
(p, a) -> p.getFileName().toString().endsWith ("txt"),
FileVisitOption.FOLLOW_LINKS);
Long fCount = paths.count();
System.out.println(fCount);
Assuming that there are NO soft-link/symbolic links to any of the files in the directory structure, what is the result?

正解: B
Given the code fragment:

What is the result?

正解: C
Given the code fragment:
LocalDate valentinesDay =LocalDate.of(2015, Month.FEBRUARY, 14);
LocalDate nextYear = valentinesDay.plusYears(1);
nextYear.plusDays(15); //line n1
System.out.println(nextYear);
What is the result?

正解: C
Given the code fragments:

and

What is the result?

正解: A
Given the code fragment:
public static void main (String[] args) throws IOException {
BufferedReader brCopy = null;
try (BufferedReader br = new BufferedReader (new FileReader("employee.txt"))) { // line n1 br.lines().forEach(c -> System.out.println(c)); brCopy = br;//line n2
}
brCopy.ready(); //line n3;
}
Assume that the ready method of the BufferedReader, when called on a closed BufferedReader, throws an exception, and employee.txt is accessible and contains valid text.
What is the result?

正解: C
Given:
public class Emp {
String fName;
String lName;
public Emp (String fn, String ln) {
fName = fn;
lName = ln;
}
public String getfName() { return fName; }
public String getlName() { return lName; }
}
and the code fragment:
List<Emp> emp = Arrays.asList (
new Emp ("John", "Smith"),
new Emp ("Peter", "Sam"),
new Emp ("Thomas", "Wale"));
emp.stream()
//line n1
.collect(Collectors.toList());
Which code fragment, when inserted at line n1, sorts the employees list in descending order of fName and then ascending order of lName?

正解: C
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