java - How can we put value on text field on output screen? -

i want put value in txtf1 @ output screen , it. how can put value on text field on output screen?

import java.awt.color; import java.awt.textfield; import java.awt.event.actionevent; import java.awt.event.actionlistener; import javax.swing.jframe; import javax.swing.jpanel; import javax.swing.jtextfield; import javax.swing.swingconstants;  public class demog extends jpanel implements actionlistener{  private textfield textf, txtf1;  public void jhand(){ textf = new textfield();     textf.setsize(40, 40);     textf.settext("20");     textf.seteditable(false);     textf.setbackground(color.white);     textf.setforeground(color.black);     //textf.sethorizontalalignment(swingconstants.center);     textf.setlocation(15, 15);     //textf.addactionlistener(this);     txtf1 = new textfield();     txtf1.setsize(40, 40);     txtf1.gettext();     txtf1.seteditable(false);     txtf1.setbackground(color.white);     txtf1.setforeground(color.black);     //txtf1.sethorizontalalignment(swingconstants.center);     txtf1.setlocation(50, 50);     jframe frame = new jframe("demo");     jpanel p = new jpanel();     p.setopaque(true);       p.setbackground(color.white);       p.setlayout(null);       frame.setcontentpane(p);       frame.setsize(500,500);         frame.setvisible(true);         p.add(textf);         p.add(txtf1); }  public void actionperformed(actionevent evt) {     string text = textf.gettext();     system.out.println(text); }  public static void main(string... args){     demog g = new demog();     g.jhand(); } } 

you have change of code in order work. had problem in code resolved them in following code. see comments learn in swing ;-)

import java.awt.color; import java.awt.dimension; import java.awt.flowlayout; import java.awt.event.actionevent; import java.awt.event.actionlistener;  import javax.swing.jbutton; import javax.swing.jframe; import javax.swing.joptionpane; import javax.swing.jpanel; import javax.swing.jtextfield; import javax.swing.windowconstants;  // use upper case in start of class names: public class demog extends jpanel implements actionlistener {      private jtextfield textf, txtf1;      public demog() {         jhand();     }      public void jhand() {         setlayout(new flowlayout()); // set layout before add components          // can use null layout, have use setbounds() method          //      placing components. advanced layout see          //      tutorials gridbaglayout , mixing layouts each other.          textf = new jtextfield(); // not mix awt component                                    //    swing (j components. see packages)         //textf.setsize(40, 40); // use setpreferredsize instead         textf.setpreferredsize(new dimension(40, 40));         textf.settext("20");         textf.seteditable(false); // text fields getting data user                                   //    if need show user                                   //    use jlabel instead.         textf.setbackground(color.white);         textf.setforeground(color.black);         add(textf);          txtf1 = new jtextfield();         //txtf1.setsize(40, 40); use setpreferredsize instead         txtf1.setpreferredsize(new dimension(40, 40));         txtf1.gettext();         txtf1.seteditable(false);         txtf1.setbackground(color.white);         txtf1.setforeground(color.black);         add(txtf1);          jbutton b = new jbutton("click me!");         b.addactionlistener(this);         add(b);     }      public void actionperformed(actionevent evt) {         string text = textf.gettext();         joptionpane.showmessagedialog(demog.this, "\"textf\" text is: "+text);     }      public static void main(string[] args) {         jframe frame = new jframe("demo");         frame.setdefaultcloseoperation(windowconstants.exit_on_close);         demog p = new demog();         p.setbackground(color.white);         frame.setcontentpane(p);         frame.setsize(500, 500);         frame.setvisible(true);     } } 

good luck.