A.123hello"3+2
B.123,hello,3+2
C.123 hello 5
D.123 "hello" 5
A.hello world !
B.’hello world!’
C.hello world
D.list(‘hello world!’)
A.h = Hello h.showInfo()
B.h = Hello() h.showInfo(‘张三’)
C.h = Hello(‘张三’) h.showInfo()
D.h = Hello(‘admin’) showInfo
A.s.equals(t);
B.t.equals(c);
C.s==t;
D.t.equals(new String("hello"));
A.Hello, Ada Lovelace
B.hello, ada lovelace
C.Hello, ADA LOVELACE
D.hello, ada Lovelace