Java Buzz Forum - How to replace String in Java - character substring replaceAll example

String class in Java provides several methods to replace characters, CharSequence and substring from String in Java. Since String is immutable in Java, every time you performance an operation on String either replacement or removing white space from String, it generates a new String object. There are four overloaded method to replace String in Java :

replace(char oldChar, char newChar)

replace(CharSequence target, CharSequence replacement)

replaceAll(String regex, String replacement)

replaceFirst(String regex, String replacement)

Out of these, 2nd one which takes a CharSequence is added on Java 1.5. CharSequence is actually a super interface for String, StringBuffer and StringBuilder in Java, which means you can pass any of String, StringBuffer or StringBuilder Object as argument to this replace method. replaceFirst() and replaceAll() are very powerful and accepts regular expression. replaceFirst() only replace first match, while replaceAll replaces all matches with replacement String provided.


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