Oracle Java SE 11 Developer 是由 Oracle 官方舉辦的認證考試，在業界具有高度公信力，也是許多企業篩選人才的重要依據。想在 2026 年取得這張證照，Fast2test 的 1z1-819 題庫（297 題）會是你值得信賴的備考夥伴。

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問題 #1

Your organization makes mlib.jar available to your cloud customers. While working on a new feature for mlib.jar, you see that the customer visible method public void enableService(String hostName, String portNumber) executes this code fragment

and you see this grant is in the security policy file:

What security vulnerability does this expose to your cloud customer's code?

A. denial of service attack against any reachable machine
B. privilege escalation attack against the OS running the customer code
C. none because the customer code base must also be granted SocketPermission
D. XML injection attack against any mlib server
E. SQL injection attack against the specified host and port

問題 #2

What change will cause the code to compile successfully?

A. Insert PriceChecker (?) prod on line 1.
B. Insert PriceChecker <> prod on line 1.
C. Insert PriceChecker <Electronics> prod on line 1.
D. Insert PriceChecker <Plushy extends Products> prod on line 1.

問題 #3

Given:

What is the output?

A. Hello world!Bonjour le monde!
B. Bonjour le monde!Bonjour le monde!
C. Bonjour le monde!Hello world!
D. Hello world!Hello world!

問題 #4

Which two statements set the default locale used for formatting numbers, currency, and percentages? (Choose two.)

A. Locale.setDefault(Locale.Category.FORMAT, Locale.CANADA_FRENCH);
B. Locale.setDefault(Locale.Category.FORMAT, "zh-CN");
C. Locale.setDefault("es", Locale.US);
D. Locale.setDefault("en_CA");
E. Locale.setDefault(Locale.SIMPLIFIED_CHINESE);

問題 #5

Given:

What is the output?

A. Duke
B. null
C. A NoSuchElementException is thrown at run time.
D. A NullPointerException is thrown at run time.

問題與答案：