A. Char ch = “a”；
B. Char ch = ‘“‘ ‘；
C. Char ch = ‘cafe‘；
D. Char ch = “cafe”；
E. Char ch = ‘“ucafe‘；
F. Char ch = ‘“u10100‘；
G. Char ch = （char） true；

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.