Today I needed a Java method to remove all the blank characters from a
String. I started to write some code with a StringBuffer or a StringBuilder, then thought there must be some other way to do this. It's not that the StringBuilder/StringBuffer approach is hard, but just that someone must have already solved this problem.
That's when I thought of the
replaceAll method of the String class, and that I might be able to use it. Sure enough, the following line of code returns a new
String with all the blank characters removed:
String newName = oldName.replaceAll(" ", "");
Note that there is a blank space between the first set of double quotes in that line, and there is no space between the second set of quotes.
Because the first
replaceAll method takes is really a regex, you can probably remove much more complicated string patterns using this technique, but I don't have that need currently, so I didn't try it. Off the top of my head, and not even typing this following code into a compiler, this next piece of Java source code should return a new
String with all whitespace characters removed:
String newName = oldName.replaceAll("\\s", "");
Again, that code hasn't been tested or even typed into a Java IDE, so user beware.