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最新的 Java SE 1z1-809 免費考試真題 (Q123-Q128):問題 #123
Given the structure of the EHF and DEPT tables:

Given the code fragment:

What is the result?

• A. The code prints only the first record of the EM? table.
• B. The code prints all of the records in the EM? table but not with the respective department names.
• C. The code prints all of the records in the EMP table along with the respective department names.
• D. The code throws a syntax error at ResultSet because the semicolon ( is missing.
  

答案：B

問題 #124
Given the code fragment:

What is the result?

• A. A compilation error occurs at line n1.
• B. A compilation error occurs at line n2.
• C. The code reads the password without echoing characters on the console.
• D. A compilation error occurs because the IOException isn't declared to be thrown or caught?
  

答案：A

問題 #125
Given:
final class Folder {//line n1
//line n2
public void open () {
System.out.print("Open");
}
}
public class Test {
public static void main (String [] args) throws Exception {
try (Folder f = new Folder()) {
f.open();
}
}
}
Which two modifications enable the code to print Open Close?

• A. Replace line n1 with:
  class Folder implements AutoCloseable {
• B. Replace line n1 with:
  class Folder extends Closeable {
• C. Replace line n1 with:
  class Folder extends Exception {
• D. At line n2, insert:
  public void close () throws IOException {
  System.out.print("Close");
  }
• E. At line n2, insert:
  final void close () {
  System.out.print("Close");
  }
  

答案：A,D

問題 #126
Given the code fragments:
public class Book implements Comparator<Book> {
String name;
double price;
public Book () {}
public Book(String name, double price) {
this.name = name;
this.price = price;
}
public int compare(Book b1, Book b2) {
return b1.name.compareTo(b2.name);
}
public String toString() {
return name + ":" + price;
}
}
and
List<Book>books = Arrays.asList (new Book ("Beginning with Java", 2), new book ("A
Guide to Java Tour", 3));
Collections.sort(books, new Book());
System.out.print(books);
What is the result?

• A. An Exception is thrown at run time.
• B. [A Guide to Java Tour:3, Beginning with Java:2]
• C. [Beginning with Java:2, A Guide to Java Tour:3]
• D. A compilation error occurs because the Book class does not override the abstract method compareTo().
  

答案：B

問題 #127
Which statement is true about the single abstract method of the java.util.function.Function interface?

• A. It accepts one argument and always produces a result of the same type as the argument.
• B. It accepts an argument and produces a result of any data type.
• C. It accepts one argument and returns boolean.
• D. It accepts one argument and returns void.
  

答案：B
解題說明：
http://winterbe.com/posts/2014/03/16/java-8-tutorial/ (functions)

問題 #128
......
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