單項選擇題

public static void main(String[] args) { 
String str = “null‟; 
if (str == null) { 
System.out.println(”null”); 
} else (str.length() == 0) { 
System.out.println(”zero”); 
} else { 
System.out.println(”some”); 
} 
} 
What is the result?()

A. null
B. zero
C. some
D. Compilation fails.
E. An exception is thrown at runtime.

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