java - Repaint not working -

i'm having problem repaint function. in jframe pass word jpanel.

package grafisch; import logica.*; import java.awt.event.actionevent; import java.awt.event.actionlistener;   public class lingoapp extends javax.swing.jframe implements actionlistener {  /**  * creates new form lingoapp  */  letter letter = new letter(); woordenlijst woordenlijst = new woordenlijst(); lingo lingo = new lingo(); newjpanel newjpanel = new newjpanel();  public lingoapp() {     initcomponents();     volgendeknop.setenabled(false);     controleerknop.setenabled(false);     gokinput.addactionlistener(this);   }     private void controleerknopactionperformed(java.awt.event.actionevent evt) {                                                     string input = gokinput.gettext().replaceall("\\s","");     if(input.contains("0123456789") || input.length() <5 || input.length() >5 || input.isempty()){         gokinput.settext("fout");     }     else {         letter.checkletters(input);         lingo.vermeerdergok();         beurtlabelhoeveelheid.settext(integer.tostring(lingo.geefgokken()));         ///here go         newjpanel.setword(input);     }     if(!lingo.checkgokken()){         allerleilabel.settext("helaas, het woord was: "+ letter.geefwoord()+".");         controleerknop.setenabled(false);         volgendeknop.setenabled(true);     }     if(lingo.checkwoord(input)){         allerleilabel.settext("proficiat, het woord inderdaad "+ letter.geefwoord()+".");         beurtlabelhoeveelheid.settext("6");//interface fix         scorelabelhoeveelheid.settext(integer.tostring(lingo.updatescore()));         lingo.vermeerderbeurt();         controleerknop.setenabled(false);         volgendeknop.setenabled(true);     }     if(lingo.checkbeurten()){         if(lingo.checkgoedgeraden()){             system.out.println("ditmoetnogwordengedaan, 10x goed geraden");         }         else {             system.out.println("ditmoetnogwordengedaan, !10x goed geraden");         }         volgendeknop.setenabled(false);         opgevenknop.setvisible(true);         startspelknop.setvisible(true);     }  }                                                private void startspelknopactionperformed(java.awt.event.actionevent evt) {                                                    gokinput.settext("");//fix voor nieuwe ronde     allerleilabel.settext("");//fix voor nieuwe ronde     opgevenknop.setvisible(false);     startspelknop.setvisible(false);     woordenlijst.maaklijst();     string temp = woordenlijst.geefwillekeurigwoord();     letter.setwoord(temp);     lingo.setwoord(temp);     controleerknop.setenabled(true);     //maakt lijst bij start spel nadat op de knop gedrukt.de knop zal dan ook verdwijnen.     //geef woord door aan de andere klasses. }                                               private void volgendeknopactionperformed(java.awt.event.actionevent evt) {                                                   ///add reset code pls     string temp = woordenlijst.geefwillekeurigwoord();     letter.setwoord(temp);     lingo.setwoord(temp);     controleerknop.setenabled(true);     volgendeknop.setenabled(false);     allerleilabel.settext("");     gokinput.settext("");     lingo.softreset(); }                                              private void opgevenknopactionperformed(java.awt.event.actionevent evt) {                                                 // todo add handling code here:     dispose(); }                                             /**  * @param args command line arguments  */ public static void main(string args[]) {       /* create , display form */     java.awt.eventqueue.invokelater(new runnable() {         public void run() {             new lingoapp().setvisible(true);         }     }); }    // variables declaration - not modify                      private javax.swing.jlabel allerleilabel; private javax.swing.jlabel beurtlabel; private javax.swing.jlabel beurtlabelhoeveelheid; private javax.swing.jbutton controleerknop; private javax.swing.jtextfield gokinput; private javax.swing.jlabel goklabel; private javax.swing.jbutton opgevenknop; private javax.swing.jlabel scorelabel; private javax.swing.jlabel scorelabelhoeveelheid; private javax.swing.jbutton startspelknop; private javax.swing.jbutton volgendeknop; private javax.swing.jlabel jlabel1; private javax.swing.jlabel jlabel2; private javax.swing.jlabel jlabel3; private javax.swing.jlabel jlabel4; private javax.swing.jlabel jlabel5; private javax.swing.jpanel jpanel1; // end of variables declaration                     @override public void actionperformed(actionevent ae) {    controleerknop.doclick();    //eventlistener implementatie } } 

so i'm trying draw simple string inside jpanel. method setword gets input jframe clicking button. inside jpanel;

package grafisch; import java.awt.dimension; import java.awt.font; import java.awt.graphics; import javax.swing.jpanel;   public class newjpanel extends javax.swing.jpanel {  private string word = "example";  /**  * creates new form newjpanel  */ public void setword(string input){     this.word=input;     repaint(); }  @override protected void paintcomponent(graphics g) {     super.paintcomponent(g);     g.drawstring(word, 75, 100); // changed location make easier see }    public newjpanel() {     initcomponents(); } } 

note don't think code you've posted shows source of bug, , if put in effort create , post minimal example, you'll decent answer, without this, question remain unanswered. quite possibly may have 2 instances of class holds code above, 1 displayed, , 1 not displayed, , calling getword(string input) on non-displayed one, wild guess. aside, consider changing name of method since not true "getter" method rather "setter" method , should renamed setword(string word).

all can @ point problem not in code you've posted. proof of concept, modify posted code working compilable class:

import java.awt.dimension; import java.awt.font; import java.awt.graphics; import javax.swing.jpanel;  @suppresswarnings("serial") class showwordpanel extends jpanel {    private static final int pref_w = 500;    private static final int pref_h = 250;    private static final font word_font = new font(font.dialog, font.bold, 20);    private string word = "example";     // change name of method getxxx setxxx     public void setword(string input) {       this.word = input;       repaint();    }     @override    protected void paintcomponent(graphics g) {       super.paintcomponent(g);       g.setfont(word_font); // let's make big enough see       g.drawstring(word, 75, 100); // changed location make easier see    }     @override // jpanel wil big enough show text    public dimension getpreferredsize() {       if (ispreferredsizeset()) {          return super.getpreferredsize();       }       return new dimension(pref_w, pref_h);    } } 

then can use above class in gui creation class, , works fine:

import java.awt.borderlayout; import java.awt.event.actionevent; import javax.swing.*;  @suppresswarnings({ "serial"}) public class showwordpaneltest extends jpanel {    // create showwordpanel field -- guarantee    // instance displayed same 1 change     // value of word field    private showwordpanel showwordpanel = new showwordpanel();    private jtextfield textfield = new jtextfield(10);    private addwordaction addwordaction = new addwordaction("add word");     public showwordpaneltest() {       textfield.setaction(addwordaction);       jpanel toppanel = new jpanel();       toppanel.add(textfield);       toppanel.add(new jbutton(addwordaction));        showwordpanel.setborder(borderfactory.createtitledborder("show word panel"));        setlayout(new borderlayout());       add(showwordpanel, borderlayout.center);       add(toppanel, borderlayout.page_start);    }     private class addwordaction extends abstractaction {       public addwordaction(string name) {          super(name);          int mnemonic = (int) name.charat(0);          putvalue(mnemonic_key, mnemonic);       }        @override       public void actionperformed(actionevent e) {          string text = textfield.gettext(); // text          showwordpanel.setword(text); // pass showwordpanel           // make easy change text after button press          textfield.selectall();          textfield.requestfocusinwindow();       }    }     private static void createandshowgui() {       showwordpaneltest mainpanel = new showwordpaneltest();        jframe frame = new jframe("showwordpaneltest");       frame.setdefaultcloseoperation(jframe.dispose_on_close);       frame.getcontentpane().add(mainpanel);       frame.pack();       frame.setlocationbyplatform(true);       frame.setvisible(true);    }     public static void main(string[] args) {       swingutilities.invokelater(new runnable() {          public void run() {             createandshowgui();          }       });    } }