单项选择题
A.Compilation fails.
B.The file system has a new empty directory named dir.
C.The file system has a new empty directory named newDir.
D.The file system has a directory named dir, containing a file f1.txt.
E.The file system has a directory named newDir, containing a file f1.txt.
单项选择题 Whichcapabilityexistsonlyinjava.io.BufferedWriter?()
单项选择题 Assuming that the serializeBanana() and the deserializeBanana() methods will correctly use Java serialization and given: What is the result?()
多项选择题 Which two statements are true if a NullPointerException is thrown on line 3 of class C?()