Replace in string

Question

I have a string s composed of two strings s1 and s2, s = s1+s2.

I'd like to be able to modify s1 in another function, and then recompose s with the modified version of s1. I'd like to change s1 so that it takes s2 as a paramater. For example, s1 = "1+" and s2="2", and I'd like s to become "incr(" + s2 + ")".

I could do that by using s1 = "incr(%s2%)" and then s1.replace("%s2%",s2), but what if s1 already contains "%s2%" ? I'd like it to be as generic as possible.

Is there any way to do that ?

I think you could use String.format() function http://stackoverflow.com/questions/3695230/how-to-use-java-string-format — Josef Prochazka, May 29 '13 at 13:24

Jonas Eicher · Answer 1 · 2013-05-29T13:33:10.517

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String is an immutable class, meaning you cannot modify it. All String methods create a new String, instead of modifying the String.

You could however use toCharArray (or StringBuilder for more flexibility), which is mutable.

edited May 29 '13 at 13:33

answered May 29 '13 at 13:24

Jonas Eicher

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But my question is how to create a new string whose content depends on s2? – Car981 May 29 '13 at 13:38
It is a pretty common approach. The wording for placeholders in Property-files is i.e. ${myVariableName} – Jonas Eicher May 29 '13 at 15:11

score 0 · Answer 2 · answered May 29 '13 at 13:28

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If you want editable Strings in Java, use StringBuilder class (http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/StringBuilder.html). That has multiple methods for mannipulation and replacing substring.

answered May 29 '13 at 13:28

Martin Perry

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score 0 · Answer 3 · answered May 29 '13 at 13:50

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Use StringBuffer if synchronization is required or else use StringBuilder to reduce the overhead of synchronization. Both are mutable classes. They have many methods to modify the content of String.

answered May 29 '13 at 13:50

MaheshVarma

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Replace in string

3 Answers3