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用户6617885566

#1 Created at ... [Delete] [Delete and Lock User]

why my result is changed?

 Hello

HELLO

is it correct?

用户5527594890

#2 Created at ... [Delete] [Delete and Lock User] 
Yes. Because s =s.toUpperCase(),这个语句把s又指向了变为大写的字符串。如果你写成：

String s = "Hello";
String s1 = s.toUpperCase();
System.out.println(s); //Hello 没变
System.out.println(s1); //HELLO 变为大写

吴颖超c

#3 Created at ... [Delete] [Delete and Lock User]

谢哥们

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