java - display control character as space in TextField -

i have display string in component textbox,textfile in javafx. string can contain control,non printable characters (i.e characters in ascii < 32). when display string on console println() control characters replacing space( in view) because can copy , past same string still control characters.by default non printable characters skiped displaying. want receive same resultat display/enter special characters in javafx's component have place in java console, possible??

feel free use and/or edit code made:

import java.awt.toolkit; import java.awt.datatransfer.clipboard; import java.awt.datatransfer.dataflavor; import java.awt.datatransfer.stringselection; import java.awt.datatransfer.unsupportedflavorexception; import java.io.ioexception;  import javax.swing.jtextfield; import javax.swing.text.attributeset; import javax.swing.text.badlocationexception; import javax.swing.text.plaindocument;  /**  * text field control characters displayed same optional  * char. default replacement char space.  */ public class mytextfield extends jtextfield {      private static final long serialversionuid = -4027593772585498003l;     private static final clipboard clipboard =             toolkit.getdefaulttoolkit().getsystemclipboard();      //string control characters aren't replaced     private string ctrltext;     //char replacing control characters     private char replacementchar;      public mytextfield() {         this(null, 0);     }     public mytextfield(int columns) {         this(null, columns);     }     public mytextfield(string text) {         this(text, 0);     }     public mytextfield(string text, int columns) {         ctrltext = (text == null) ? "" : text;         setreplacementchar(' ');         setdocument(new customdocument());         settext(text);         setcolumns(columns);     }     /**      * sets char replace control characters.      *       * @param ch  char replace control characters      */     public void setreplacementchar(char ch) {         replacementchar = ch;     }      @override     public void cut() {         int start = getselectionstart();         int end   = getselectionend();          //copy clipboard         string data = ctrltext.substring(start, end);         clipboard.setcontents(new stringselection(data), null);          //set new text         string newtext = ctrltext.substring(0, start) + ctrltext.substring(end);         settext(newtext);     }     @override     public void copy() {         int start = getselectionstart();         int end   = getselectionend();          //copy clipboard         string data = ctrltext.substring(start, end);         clipboard.setcontents(new stringselection(data), null);     }     @override     public void paste() {         int start = getselectionstart();         int end   = getselectionend();          //get data clipboard         string data = null;         try { data = (string)clipboard.getdata(dataflavor.stringflavor); }         catch (unsupportedflavorexception e) {}         catch (ioexception e) {}          //set new text         string newtext = ctrltext.substring(0, start)                 + data                 + ctrltext.substring(end);         settext(newtext);     }     /**      * replaces control characters replacement char.      *       * @param text  string control characters replaced      * @return      resulting string      */     private string replacectrlchars(string text) {         if(text == null) return null;          return text.replaceall("\\p{cntrl}", "" + replacementchar);     }     /**      * document control characters displayed replacement char.      */     private class customdocument extends plaindocument {         @override         public void remove(int offs, int len) throws badlocationexception {             //remove ctrltext             ctrltext = ctrltext.substring(0, offs)                     + ctrltext.substring(offs + len);             //remove text field             super.remove(offs, len);         }         @override         public void insertstring(int offs, string str, attributeset a)                 throws badlocationexception {             //insert ctrltext             ctrltext = ctrltext.substring(0, offs)                     + str                     + ctrltext.substring(offs);             //insert string replaced chars text field             super.insertstring(offs, replacectrlchars(str), a);         }         private static final long serialversionuid = -6187351778620427126l;     } } 

it's text field control characters (those ascii < 32 or == 127), displayed same, optional char.

the default replacement char space, can set displayable char calling setreplacementchar. i'd use question mark.