Which two statements are true about synchronization and locks? (Choose two.)

• A.A thread exclusively owns the intrinsic lock of an object between the time it acquires the lock and the time it releases it.
• B.The intrinsic lock will be retained by a thread if return from a synchronized method is caused by an uncaught exception.
• C.A thread automatically acquires the intrinsic lock on a synchronized statement when executed.
• D.A thread automatically acquires the intrinsic lock on a synchronized method's object when entering that method.
• E.Threads cannot acquire intrinsic locks on classes.

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Given:

and the code fragment:

What is the result?

• A.A compilation error occurs at line n1.
• B.A compilation error occurs because the try block doesn't have a catch or finally block.
• C.A compilation error occurs at line n2.
• D.The program compiles successfully.

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Given the records from the STUDENT table:

Given the code fragment:

Assume that the URL, username, and password are valid.
What is the result?

• A.The STUDENT table is not updated and the program prints:114 : John : [email protected]
• B.The STUDENT table is updated with the record:113 : Jannet : [email protected] the program prints:114 : John : [email protected]
• C.The STUDENT table is updated with the record:113 : Jannet : [email protected] the program prints:113 : Jannet : [email protected]
• D.A SQLException is thrown at run time.

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You want to create a singleton class by using the Singleton design pattern.
Which two statements enforce the singleton nature of the design?

• A.Make the constructor private.
• B.Use a staticreference to point to the single instance.
• C.Implement the Serializableinterface.
• D.Override equals() and hashCode() methods of the java.lang.Object class.
• E.Make the class static.

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Given:
public class Foo<K, V> {
private K key;
private V value;
public Foo (K key, V value) (this.key = key; this value = value;)
public static <T> Foo<T, T> twice (T value) (return new Foo<T, T> (value, value); )
public K getKey () (return key;)
public V getValue () (return value;)
}
Which option fails?

• A.Foo<String, String> pair = Foo.<String>twice ("Hello World!");
• B.Foo<String, Integer> mark = new Foo<String, Integer> ("Steve", 100);
• C.Foo<?, ?> percentage = new Foo <> (97, 32);
• D.Foo<String, String> grade = new Foo <> ("John", "A");

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