swing - Trying to implement JComboBox into program - Java -


this first post!

i'm trying implement combo box made in tutcombo program examgradesgui + examgrades one. can see in tutcombo program, there 'string subjectunittxt'. ideally, replace 'subjectunittxt' in examgradesgui program, having functionality of combo box , being able saved file along firstname, lastname , exammark. if tell me how this, great. sorry if have added code. thanks

i got work making minor changes in code (see attached code). search "unitcombo".

import java.awt.color;  import java.awt.gridlayout;  import java.awt.event.actionevent;  import java.awt.event.actionlistener;  import javax.swing.jbutton;  import javax.swing.jcombobox;  import javax.swing.jframe;  import javax.swing.jlabel;  import javax.swing.joptionpane;  import javax.swing.jpanel;  import javax.swing.jtextfield;    public class examgradesgui {      public static void main(string[] args) {          new examgradesgui();      }        string[] firstname = new string[20];      string[] lastname = new string[20];      string[] subjectunit = new string[20];      double[] exammark = new double[20];      private jlabel firstnamelbl, lastnamelbl, unitlbl, marklbl;      private jtextfield firstnametxt, lastnametxt, subjectunittxt, exammarktxt;      private jcombobox<string> unitcombo;      private jbutton btnclear, btnsave, btnopen, btnexit;      private jpanel panel;      private jframe frame;        public examgradesgui(){          buildframe();          buildfields();          buildbuttons();          frame.setvisible(true);          frame.add(panel);      }        public void buildframe(){          frame = new jframe("gradeenter");          frame.setsize(650,450);          frame.setdefaultcloseoperation(jframe.exit_on_close);            panel = new jpanel();          panel.setlayout(null);          panel.setbackground(color.white);      }        public void buildfields(){            // labels, user input + location            firstnametxt = new jtextfield(10);          firstnametxt.setbounds(180, 80, 150, 20);          panel.add(firstnametxt);            string str = firstnametxt.gettext();           if(str.matches("[-a-za-z]*"))          {          }          else          {              joptionpane.showmessagedialog(null, "please enter amount donating");          }            lastnametxt = new jtextfield(10);          lastnametxt.setbounds(180, 110, 150, 20);          panel.add(lastnametxt);            subjectunittxt = new jtextfield(10);          string[] courses = {"computing","forensic","business"};          unitcombo = new jcombobox<string>(courses);          //subjectunittxt.setbounds(180, 140, 150, 20);          //panel.add(subjectunittxt);          unitcombo.setbounds(180, 140, 150, 20);          panel.add(unitcombo);            // if have time: turn combo box gui - refer testgui.java            exammarktxt = new jtextfield(10);          exammarktxt.setbounds(180, 170, 150, 20);          panel.add(exammarktxt);            firstnamelbl = new jlabel("first name:");          firstnamelbl.setbounds(70, 80, 100, 20);          panel.add (firstnamelbl);            lastnamelbl = new jlabel("last name:");          lastnamelbl.setbounds(70, 110, 100, 20);          panel.add (lastnamelbl);            unitlbl = new jlabel("unit:");          unitlbl.setbounds(70, 140, 100, 20);          panel.add (unitlbl);            marklbl = new jlabel("mark:");          marklbl.setbounds(70, 170, 100, 20);          panel.add (marklbl);        }        public void buildbuttons() {          btnclear = new jbutton ("reset fields");          btnclear.setbounds(55, 220, 110, 20);          btnclear.addactionlistener(new clearbuttonlistener());          panel.add (btnclear);            btnsave = new jbutton ("save");          btnsave.setbounds(155, 220, 70, 20);          btnsave.addactionlistener(new savebutton());          panel.add (btnsave);            btnopen = new jbutton ("open 'gradeenter.txt' ");          btnopen.setbounds(90, 250, 200, 20);          btnopen.addactionlistener(new openbutton());          panel.add (btnopen);              btnexit = new jbutton ("exit");          btnexit.setbounds(255, 220, 70, 20);          btnexit.addactionlistener(new exitbutton());          panel.add (btnexit);        }      public void settext() {          firstnametxt.settext("");          lastnametxt.settext("");          subjectunittxt.settext("");          exammarktxt.settext("");      }        public void gettext() {          int = 0;          i++;          firstname[i] = firstnametxt.gettext();          lastname[i] = lastnametxt.gettext();          subjectunit[i] = unitcombo.getitemat(unitcombo.getselectedindex());          exammark[i] = double.parsedouble(exammarktxt.gettext());      }      private class clearbuttonlistener implements actionlistener {            public void actionperformed (actionevent e) {              settext();          }      }        private class savebutton implements actionlistener {            public void actionperformed(actionevent e) {              gettext();              settext();                examgrades save = new examgrades();              save.fileopen();              save.addrecords(firstname, lastname, subjectunit, exammark);              joptionpane.showmessagedialog(null, "entry saved!");              save.fileclose();            }      }      private class openbutton implements actionlistener {            public void actionperformed(actionevent e) {              try {                   joptionpane.showmessagedialog(null, "'gradeenter.txt' opening in java!");                   thread.sleep(2); // adds 2 second delay user can read dialog message                  runtime.getruntime().exec("eclipse gradeenter.txt" );                  } catch (exception nofilefound) {                   system.out.println("couldn't open or find file.");              }           }      }        class exitbutton implements actionlistener{          public void actionperformed(actionevent e) {              int n = joptionpane.showconfirmdialog(frame,                       "are sure want exit?",                       "exit?",                       joptionpane.yes_no_option);              if(n == joptionpane.yes_option){                  system.exit(0);              }          }      }    }


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