I tried to repl开发者_运维知识库ace characters in String which works sometimes and does not work most of the time.
I tried the following:
String t = "[javatag]";
String t1 = t;
String t2 = t;
t.replace("\u005B", "");
t.replace("\u005D", "");
t1.replace("[", "");
t1.replace("]", "");
t2.replace("\\]", "");
t2.replace("\\[", "");
System.out.println(t+" , "+t1+" , "+t2);
The resulting output is still "[javatag] , [javatag] , [javatag]
" without the "[" and "]" being replaced.
What should I do to replace those "[" and "]" characters ?
String
objects in java are immutable. You can't change them.
You need:
t2 = t2.replace("\\]", "");
replace()
returns a new String
object.
Edit: Because ... I'm breaking away from the pack
And since this is the case, the argument is actually a regex, and you want to get rid of both brackets, you can use replaceAll()
instead of two operations:
t2 = t2.replaceAll("[\\[\\]]", "");
This would get rid of both opening and closing brackets in one fell swoop.
Strings are immutable so
t.replace(....);
does nothing
you need to assign the output to some variable like
t = t.replace(....);
String
s in Java are immutable, meaning you can't change them. Instead, do t1 = t1.replace("]", "");
. This will assign the result of replace
to t1.
String.replace doesn't work that way. You have to use something like t = t.replace("t", "")
String.replace() returns a new string after replacing the required characters. Hence you need to do it in this way:
String t = "[javatag]";
t = t.replace("[","");
t = t.replace("]","");
t.replace(....);
gives you a String (return a string)
you can reassign the origin variable name to the new string
and the old string will later been garbage-collected :)
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