Given the content of /resourses/Message.properties:
welcome1="Good day!"
and given the code fragment:
10 11 12 13 14 15 | Properties prop = new Properties(); FileInputStream fis = new FileInputStream("/resources/Message.properties"); prop.load(fis); System.out.println(prop.getProperty("welcome1")); System.out.println(prop.getProperty("welcome2", "Test"));//line n1 System.out.println(prop.getProperty("welcome3")); |
What is the result?
A.
Good day!
Test
followed by an Exception stack trace
B.
Good day!
followed by an Exception stack trace
C.
Good day!
Test
null
D. A compilation error occurs at line n1.
題解
程式第13行，會輸出「/resourses/Message.properties」中「welcome1」鍵值所對應的值，即為「Good day!」。
程式第14行，由於「/resourses/Message.properties」中不存在「welcome2」鍵值，但有設定預設值「Test」，所以會輸出預設值「Test」。
程式第15行，由於「/resourses/Message.properties」中不存在「welcome3」鍵值，所以輸出「null」。
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