4. 定义字符串String s1="hello";，下面的程序段输出的结果是（ ）。
if (s1.equals("hello"))
System.out.println("s1 equals \"hello\"");
else
System.out.println("s1 does not equals \"hello\"");
A. s1 equals "hello"
B. s1 does not equals "hello"
C. s1 equals \"hello\"
D. s1 does not equals \"hello\"
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