Strings and Things - Java - page 100

String s = "Father Charles Goes Down And Ends Battle" ;

// Put it in the stack frontwards
Stack < String > myStack = new

new Stack <>();

StringTokenizer st = new new StringTokenizer ( s );

while while ( st . hasMoreTokens ()) {

myStack . push ( st . nextToken ());

}

// Print the stack backwards
System . out . print ( '"' + s + '"' + " backwards by word is:\n\t\"" );
while while (! myStack . empty ()) {

System . out . print ( myStack . pop ());
System . out . print ( ' ' );

}
System . out . println ( '"' );

Expanding and Compressing Tabs

Problem

You need to convert space characters to tab characters in a file, or vice versa. You might
want to replace spaces with tabs to save space on disk, or go the other way to deal with a
device or program that can't handle tabs.

Solution

Use my Tabs class or its subclass EnTab .

Discussion

Example 3-7 is a listing of EnTab , complete with a sample main program. The program
works a line at a time. For each character on the line, if the character is a space, we see if we
can coalesce it with previous spaces to output a single tab character. This program depends
on the Tabs class, which we'll come to shortly. The Tabs class is used to decide which
column positions represent tab stops and which do not. The code also has several Debug prin-
touts; these are controlled by an environment setting (see the online code in the
com.darwinsys.util.Debug class).