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1. Given:
java
import java.io.*;
class A implements Serializable {
int number = 1;
}
class B implements Serializable {
int number = 2;
}
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("o.ser");
A a = new A();
var oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(a);
oos.close();
var ois = new ObjectInputStream(new FileInputStream(file));
B b = (B) ois.readObject();
ois.close();
System.out.println(b.number);
}
}
What is the given program's output?

A) 2
B) NotSerializableException
C) 1
D) ClassCastException
E) Compilation fails

2. Given:
java
var sList = new CopyOnWriteArrayList<Customer>();
Which of the following statements is correct?

A) Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.
B) The CopyOnWriteArrayList class does not allow null elements.
C) The CopyOnWriteArrayList class's iterator reflects all additions, removals, or changes to the list since the iterator was created.
D) The CopyOnWriteArrayList class is a thread-safe variant of ArrayList where all mutative operations are implemented by making a fresh copy of the underlying array.
E) The CopyOnWriteArrayList class is not thread-safe and does not prevent interference amongconcurrent threads.

3. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.generate(() -> "a");
B) Stream<String> stream = Stream.builder().add("a").build();
C) Stream stream = new Stream();
D) Stream stream = Stream.ofNullable("a");
E) Stream stream = Stream.empty();
F) Stream stream = Stream.of();
G) Stream stream = Stream.of("a");

4. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A) United-States
B) -UnitedStates
C) UNITED-STATES
D) United-STATES
E) -UNITEDSTATES
F) -UnitedSTATES
G) UnitedStates

5. Given:
java
var array1 = new String[]{ "foo", "bar", "buz" };
var array2[] = { "foo", "bar", "buz" };
var array3 = new String[3] { "foo", "bar", "buz" };
var array4 = { "foo", "bar", "buz" };
String array5[] = new String[]{ "foo", "bar", "buz" };
Which arrays compile? (Select 2)

A) array5
B) array3
C) array2
D) array4
E) array1

問題與答案：