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單項(xiàng)選擇題

public class foo { 
public static void main (String[]args) { 
String s; 
system.out.printIn (“s=” + s); 
} 
}  
What is the result?()  

A. The code compiles and “s=” is printed.
B. The code compiles and “s=null” is printed.
C. The code does not compile because string s is not initialized.
D. The code does not compile because string s cannot be referenced.
E. The code compiles, but a NullPointerException is thrown when toString is called.

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