A.java.util.concurrent.Callable

B.java.util.function.Predicate

C.java.util.function.Function

D.java.lang.Runnable

A.Hello world!Bonjour le monde!

B.Hello world!Hello world!

C.Bonjour le monde!Hello world!

D.Bonjour le monde!Bonjour le monde!

A.javac -d /code /code/a/Test.java

B.java /code/a/Test.java

C.javac -d /code /code/a/Test

D.java -cp /code a.Test

E.java /code/a/Test.java /code/b/Best.java

F.javac -d /code /code/a/Test.java /code/b/Best.java

A.Make the class abstract.

B.Implement only writeReplace to replace the instance with a serial proxy and not readResolve.

C.Declare fields transient.

D.Implement only readResolve to replace the instance with a serial proxy and not writeReplace.

E.Define the serialPersistentFields array field.

A.Hat at store 4

B.An indexOutofBoundsException is thrown at runtime.

C.At once 0

D.At once 1

E.Hat at store 1