Oracle 1z0-809 問題集

質問 1：
Given the code fragment:

Which statement can be inserted into line n1 to print 1,2; 1,10; 2,20;?
A. BiConsumer<Integer, Integer, Integer> c = (i, j) -> {System.out.print (i + "," + j+ "; ");};
B. BiConsumer<Integer, Integer, String> c = (i, j) -> {System.out.print (i + "," + j+ "; ")};
C. BiFunction<Integer, Integer, String> c = (i, j) -> {System.out.print (i + "," + j+ "; ")};
D. BiConsumer<Integer,Integer> c = (i, j) -> {System.out.print (i + "," + j+ "; ");};
正解：C
解説: (Topexam メンバーにのみ表示されます)

質問 2：
Given the code fragment:
Path source = Paths.get ("/data/december/log.txt");
Path destination = Paths.get("/data");
Files.copy (source, destination);
and assuming that the file /data/december/log.txt is accessible and contains:
10-Dec-2014 - Executed successfully
What is the result?
A. A FileNotFoundException is thrown at run time.
B. A FileAlreadyExistsException is thrown at run time.
C. The program executes successfully and does NOT change the file system.
D. A file with the name log.txt is created in the /data directory and the content of the /data/december/log.
txt file is copied to it.
正解：B

質問 3：
Given the code fragment:
List<Integer> codes = Arrays.asList (10, 20);
UnaryOperator<Double> uo = s -> s +10.0;
codes.replaceAll(uo);
codes.forEach(c -> System.out.println(c));
What is the result?
A. 1020
B. 20.030.0
C. A compilation error occurs.
D. A NumberFormatException is thrown at run time.
正解：C

質問 4：
Given the code fragment:
List<String> empDetails = Arrays.asList("100, Robin, HR", "200, Mary, AdminServices","101, Peter, HR"); empDetails.stream()
.filter(s-> s.contains("r"))
.sorted()
.forEach(System.out::println); //line n1
What is the result?
A. 100, Robin, HR200, Mary, AdminServices101, Peter, HR
B. 101, Peter, HR200, Mary, AdminServices
C. E. A compilation error occurs at line n1.
D. 100, Robin, HR101, Peter, HR
正解：A

質問 5：
Given the code fragment:

Which modification enables the code to print Price 5 New Price 4?
A. Replace line n3 with .forEach (n -> System.out.println ("New Price" + n));
B. Replace line n2 with .map (n -> System.out.println ("New Price" + n -1)) and remove line n3
C. Replace line n2 with .mapToInt (n -> n - 1);
D. Replace line n1 with .forEach (e -> System.out.print ("Price" + e))
正解：A

質問 6：
Given:

and the code fragment:

What is the result?
A. truetrue
B. falsetrue
C. truefalse
D. falsefalse
正解：C

質問 7：
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 nothing.
B. The program prints Connection Established.
C. A SQLException is thrown at runtime.
D. A ClassNotFoundException is thrown at runtime.
正解：B

質問 8：
Given:

Which option fails?
A. Foo<Object, Object> percentage = new Foo<Object, Object>("Steve", 100);
B. Foo<String, String> pair = Foo.<String>twice ("Hello World!");
C. Foo<String, String> grade = new Foo <> ("John", "A");
D. Foo<String, Integer> mark = new Foo<Object, Object> ("Steve", 100);
正解：A

質問 9：
Given the code fragment:

Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWord exists The Employee table has a column ID of type integer and the SQL query matches one record.
What is the result?
A. Compilation fails at line 15.
B. The code prints Error.
C. The code prints the employee ID.
D. Compilation fails at line 14.
正解：D