Strings and Things - Java - page 110

Trimming Blanks from the End of a String

Problem

You need to work on a string without regard for extra leading or trailing spaces a user may
have typed.

Solution

Use the String class trim() method.

Discussion

Example 3-10 uses trim() to strip an arbitrary number of leading spaces and/or tabs from
lines of Java source code in order to look for the characters //+ and //- . These strings are
special Java comments I use to mark the parts of the programs in this topic that I want to in-
clude in the printed copy.

Example 3-10. GetMark.java (trimming and comparing strings)
public public class GetMark {

/** the default starting mark. */
public

class GetMark

public final final String START_MARK = "//+" ;

/** the default ending mark. */
public public final final String END_MARK = "//-" ;

/** Set this to TRUE for running in "exclude" mode (e.g., for
* building exercises from solutions) and to FALSE for running
* in "extract" mode (e.g., writing a book and omitting the
* imports and "public class" stuff).
*/
public public final true ;

/** True if we are currently inside marks. */
protected

final static static boolean boolean START = true

protected boolean boolean printing = START ;

/** True if you want line numbers */
protected protected final final boolean boolean number = false false ;

/** Get Marked parts of one file, given an open LineNumberReader.
* This is the main operation of this class, and can be used
* inside other programs or from the main() wrapper.
*/
public

public void void process ( String fileName ,

LineNumberReader is ,