java - How to add JCheckBox in JTable? -

first of apologize english neglect explain problem.

first want jcheckbox in jtable have.

i retrieving student id , student name database in column index 0 , 1. want third column should absent/present take whether student present or absent jcheckbox value.

here code jtable values :

attendance.java

/*  * change template, choose tools | templates  * , open template in editor.  */ package shreesai;  import java.sql.connection; import java.sql.preparedstatement; import java.sql.resultset; import java.util.vector;  /**  *  * @author admin  */ public class attendance{      connection con = connectdatabase.connecrdb();     public vector getemployee()throws exception     {          vector<vector<string>> employeevector = new vector<vector<string>>();          preparedstatement pre = con.preparestatement("select studentid,name student");         resultset rs = pre.executequery();         while(rs.next())         {              vector<string> employee = new vector<string>();             employee.add(rs.getstring(1)); //empid             employee.add(rs.getstring(2));//name             employeevector.add(employee);          }                 if(con!=null)         con.close();         rs.close();         pre.close();          return employeevector;     } } 

this code taking values database saving vector

attendancegui.java

/*  * change template, choose tools | templates  * , open template in editor.  */ package shreesai;  import static java.awt.frame.maximized_both; import java.util.vector; import javax.swing.joptionpane;  /**  *  * @author admin  */ public class attendancegui extends javax.swing.jframe {      /**      * creates new form attendancegui      */     private vector<vector<string>> data;     private vector<string> header;     public attendancegui() throws exception {          this.setlocationrelativeto(null);         setextendedstate(maximized_both);         attendance att = new attendance();         data = att.getemployee();          header = new vector<string>();         header.add("student id");         header.add("student name");         header.add("absent/present");         initcomponents();     }     /**      * method called within constructor initialize form.      * warning: not modify code. content of method      * regenerated form editor.      */     @suppresswarnings("unchecked")     // <editor-fold defaultstate="collapsed" desc="generated code">                               private void initcomponents() {          jscrollpane1 = new javax.swing.jscrollpane();         attendancet = new javax.swing.jtable();          setdefaultcloseoperation(javax.swing.windowconstants.exit_on_close);          attendancet.setmodel(new javax.swing.table.defaulttablemodel(             data,header         ));         jscrollpane1.setviewportview(attendancet);          javax.swing.grouplayout layout = new javax.swing.grouplayout(getcontentpane());         getcontentpane().setlayout(layout);         layout.sethorizontalgroup(             layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)             .addgroup(layout.createsequentialgroup()                 .addcontainergap()                 .addcomponent(jscrollpane1, javax.swing.grouplayout.preferred_size, javax.swing.grouplayout.default_size, javax.swing.grouplayout.preferred_size)                 .addcontainergap(397, short.max_value))         );         layout.setverticalgroup(             layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)             .addgroup(layout.createsequentialgroup()                 .addcontainergap()                 .addcomponent(jscrollpane1, javax.swing.grouplayout.preferred_size, javax.swing.grouplayout.default_size, javax.swing.grouplayout.preferred_size)                 .addcontainergap(89, short.max_value))         );          pack();     }// </editor-fold>                              /**      * @param args command line arguments      */     public static void main(string args[]) {         /* set nimbus , feel */         //<editor-fold defaultstate="collapsed" desc=" , feel setting code (optional) ">         /* if nimbus (introduced in java se 6) not available, stay default , feel.          * details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html           */         try {             (javax.swing.uimanager.lookandfeelinfo info : javax.swing.uimanager.getinstalledlookandfeels()) {                 if ("nimbus".equals(info.getname())) {                     javax.swing.uimanager.setlookandfeel(info.getclassname());                     break;                 }             }         } catch (classnotfoundexception ex) {             java.util.logging.logger.getlogger(attendancegui.class.getname()).log(java.util.logging.level.severe, null, ex);         } catch (instantiationexception ex) {             java.util.logging.logger.getlogger(attendancegui.class.getname()).log(java.util.logging.level.severe, null, ex);         } catch (illegalaccessexception ex) {             java.util.logging.logger.getlogger(attendancegui.class.getname()).log(java.util.logging.level.severe, null, ex);         } catch (javax.swing.unsupportedlookandfeelexception ex) {             java.util.logging.logger.getlogger(attendancegui.class.getname()).log(java.util.logging.level.severe, null, ex);         }         //</editor-fold>          /* create , display form */         java.awt.eventqueue.invokelater(new runnable() {             public void run() {                 try{                     new attendancegui().setvisible(true);                 }                 catch(exception e){                     joptionpane.showmessagedialog(null,e);                 }             }         });     }     // variables declaration - not modify                          private javax.swing.jtable attendancet;     private javax.swing.jscrollpane jscrollpane1;     // end of variables declaration                    } 

my problemis can't add jcheckbox in front of every student have seen jtabel model, renderer , don't anything. want this...

i've search stuff couple of weeks did bot suitable this

start how use tables.

your table model needs several things.

1. it needs return boolean.class getcolumnclass method appropriate column. need override method.
2. the method iscelleditable need return true table column want make editable (so user can change value of column)
3. you're table model need capable of holding value column
4. make sure pass valid value boolean column row, otherwise null

updated simple example

import java.awt.eventqueue; import java.util.vector; import javax.swing.jframe; import javax.swing.jscrollpane; import javax.swing.jtable; import javax.swing.uimanager; import javax.swing.unsupportedlookandfeelexception; import javax.swing.table.defaulttablemodel;  public class tabletest {    public static void main(string[] args) {     new tabletest();   }    public tabletest() {     startui();   }    public void startui() {     eventqueue.invokelater(new runnable() {       @override       public void run() {         try {           uimanager.setlookandfeel(uimanager.getsystemlookandfeelclassname());         } catch (classnotfoundexception | instantiationexception | illegalaccessexception | unsupportedlookandfeelexception ex) {           ex.printstacktrace();         }          mytablemodel model = new mytablemodel();         model.addrow(new object[]{0, "brian", false});         model.addrow(new object[]{1, "ned", false});         model.addrow(new object[]{2, "john", false});         model.addrow(new object[]{3, "drogo", false});         jtable table = new jtable(model);          jframe frame = new jframe("testing");         frame.setdefaultcloseoperation(jframe.exit_on_close);         frame.add(new jscrollpane(table));         frame.pack();         frame.setlocationrelativeto(null);         frame.setvisible(true);       }     });   }    public class mytablemodel extends defaulttablemodel {      public mytablemodel() {       super(new string[]{"id", "name", "present"}, 0);     }      @override     public class<?> getcolumnclass(int columnindex) {       class clazz = string.class;       switch (columnindex) {         case 0:           clazz = integer.class;           break;         case 2:           clazz = boolean.class;           break;       }       return clazz;     }      @override     public boolean iscelleditable(int row, int column) {       return column == 2;     }      @override     public void setvalueat(object avalue, int row, int column) {       if (avalue instanceof boolean && column == 2) {         system.out.println(avalue);         vector rowdata = (vector)getdatavector().get(row);         rowdata.set(2, (boolean)avalue);         firetablecellupdated(row, column);       }     }    }  } 

ps- highly recommend avoid form editors until have better understanding of how swing works - imho