Oracle 1Z0-804 問題集

質問 1：
Given:
String s = new String("3"); System.out.print(1 + 2 + s + 4 + 5);
What is the result?
A. 1239
B. 3345
C. 12345
D. Compilation fails.
E. 339
正解：B
解説: (Topexam メンバーにのみ表示されます)

質問 2：
Given: And the command-line invocation: Java Tracker 12 11

What is the result?
A. class InvalidAgeException
B. General category
C. class java.lang.IllegalArgumentException
D. class java.lang.RuntimeException
正解：A
解説: (Topexam メンバーにのみ表示されます)

質問 3：
Sam has designed an application. It segregates tasks that are critical and executed frequently from tasks that are non critical and executed less frequently. He has prioritized these tasks based on their criticality and frequency of execution. After close scrutiny, he finds that the tasks designed to be non critical are rarely getting executed.
From what kind of problem is the application suffering?
A. race condition
B. starvation
C. deadlock
D. livelock
正解：C
解説: (Topexam メンバーにのみ表示されます)

質問 4：
Given the Greetings.properties file, containing:

What is the result?
A. Hello, everyone!
B. HELLO_MSG
C. Goodbye everyone!
D. Compilation fails
E. GOODGYE_NSG
正解：D
解説: (Topexam メンバーにのみ表示されます)

質問 5：
What are two differences between Callable and Runnable?
A. A Callable can throw an Exception when executing, but a Runnable cannot.
B. A Callable can return a value when executing, but a Runnable cannot.
C. A Callable can be passed to a Thread, but a Runnable cannot.
D. A Callable can be executed by a ExecutorService, but a Runnable cannot.
正解：A,B
解説: (Topexam メンバーにのみ表示されます)

質問 6：
Given: What is the result?

A. cantering cantering cantering
B. an exception is thrown at runtime
C. tolting cantering tolting
D. compilation fails
正解：D
解説: (Topexam メンバーにのみ表示されます)

質問 7：
Given:

What is the result?
A. peach orange apple
B. apple orange
C. The program does not compile.
D. The program generates an exception at runtime.
E. peach orange
正解：C
解説: (Topexam メンバーにのみ表示されます)

質問 8：
Which two code blocks correctly initialize a Locale variable?
A. Locale loc1 = "UK";
B. Locale loc2 = Locale.getInstance("ru");
C. Locale loc3 = Locale.getLocaleFactory("RU");
D. Locale loc4 = Locale.UK;
E. Locale loc5 = new Locale("ru", "RU");
正解：D,E
解説: (Topexam メンバーにのみ表示されます)

質問 9：
Given the following incorrect program:

Which two changes make the program work correctly?
A. The threshold value must be increased so that the overhead of task creation does not dominate the cost of computation.
B. Results must be retrieved from the newly created MyTask instances and combined.
C. The midpoint computation must be altered so that it splits the workload in an optimal manner.
D. The myTask class must be modified to extend RecursiveAction instead of RecursiveTask
E. The compute () method must be enhanced to (fork) newly created tasks.
F. The compute () method must be changed to return an Integer result.
正解：B,F
解説: (Topexam メンバーにのみ表示されます)