奇怪的Java问题

WXY595

I encountered a very strange problem in my java program.

part of the source code:
... ...
String token = st.nextToken();
System.out.println("token="+token);
boolean abc = false;
if (token=="asdf") abc = true;
System.out.println("abc="+abc);

The result displayed in the console is:
token=asdf
abc=false

It's really strange! Since the first result has demonstrated that the value of token is "asdf", how can the statement (token=="asdf") be false?

taoran

我很少玩java，不过知道在 perl 里，字符串比较不能用“==”，只能用“eq”。不知道java里是不是一样？

烦人

没接触过JAVA,不知道它对布尔变量的赋值语法是怎样的?

WXY595

Thanks for your help. I've got the answer from another forum.  It will not be true. What this is actually doing is checking the memory location. The two Strings will have different memory locations, therefore making it false.