单项选择题
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.
单项选择题 int index = 1； int [] foo = new int [3]； int bar = foo [index]； int baz = bar + index； What is the result？（）
单项选择题 public class test（ public static void main（string[]args）{ string foo = args [1]； string foo = args [2]； string foo = args [3]； } ） And command line invocation： Java Test red green blue What is the result？（）
单项选择题 int index = 1； boolean[] test = new Boolean[3]； boolean foo= test [index]； What is the result？（）