How many spaces will Java String.trim() remove?
Returns: A copy of this string with leading and trailing white space removed, or this string if it has no leading or trailing white space.
~ Quoted from Java 1.5.0 docs
(But why didn't you just try it and see for yourself?)
From the source code (decompiled) :
public String trim() { int i = this.count; int j = 0; int k = this.offset; char[] arrayOfChar = this.value; while ((j < i) && (arrayOfChar[(k + j)] <= ' ')) ++j; while ((j < i) && (arrayOfChar[(k + i - 1)] <= ' ')) --i; return (((j > 0) || (i < this.count)) ? substring(j, i) : this); }The two while that you can see mean all the characters whose unicode is below the space character's, at beginning and end, are removed.