Get Selected Item on JComboBox | JAVA

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I've problem with a JComboBox SelectedItem can someone help me ?
I've implemented a GUI window where are a various textfield and one JComboBox. When I click button, code must create an Object with the strings of the textfield and string of ComboBox, but I've a NullPointerExceptionin SelectedItem... The code to get is :



(String)combo.getSelectedItem()


I tried too:



combo.getSelectedItem().toString()


but don't work !
I don't know if I need a ActionListener but think it's not required.










share|improve this question























  • See stackoverflow.com/questions/39789141/…

    – user7294900
    Dec 30 '18 at 12:22











  • There isn't way to get an item without modify selection ?

    – BitProgram
    Dec 30 '18 at 12:27











  • you can't select selected without selecting first

    – user7294900
    Dec 30 '18 at 12:30











  • @user7294900 I tried with try catch , but if I select another item catch again NullPointer Exception

    – BitProgram
    Dec 31 '18 at 0:59
















0















I've problem with a JComboBox SelectedItem can someone help me ?
I've implemented a GUI window where are a various textfield and one JComboBox. When I click button, code must create an Object with the strings of the textfield and string of ComboBox, but I've a NullPointerExceptionin SelectedItem... The code to get is :



(String)combo.getSelectedItem()


I tried too:



combo.getSelectedItem().toString()


but don't work !
I don't know if I need a ActionListener but think it's not required.










share|improve this question























  • See stackoverflow.com/questions/39789141/…

    – user7294900
    Dec 30 '18 at 12:22











  • There isn't way to get an item without modify selection ?

    – BitProgram
    Dec 30 '18 at 12:27











  • you can't select selected without selecting first

    – user7294900
    Dec 30 '18 at 12:30











  • @user7294900 I tried with try catch , but if I select another item catch again NullPointer Exception

    – BitProgram
    Dec 31 '18 at 0:59














0












0








0








I've problem with a JComboBox SelectedItem can someone help me ?
I've implemented a GUI window where are a various textfield and one JComboBox. When I click button, code must create an Object with the strings of the textfield and string of ComboBox, but I've a NullPointerExceptionin SelectedItem... The code to get is :



(String)combo.getSelectedItem()


I tried too:



combo.getSelectedItem().toString()


but don't work !
I don't know if I need a ActionListener but think it's not required.










share|improve this question














I've problem with a JComboBox SelectedItem can someone help me ?
I've implemented a GUI window where are a various textfield and one JComboBox. When I click button, code must create an Object with the strings of the textfield and string of ComboBox, but I've a NullPointerExceptionin SelectedItem... The code to get is :



(String)combo.getSelectedItem()


I tried too:



combo.getSelectedItem().toString()


but don't work !
I don't know if I need a ActionListener but think it's not required.







java nullpointerexception jcombobox






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Dec 30 '18 at 12:20









BitProgramBitProgram

147




147













  • See stackoverflow.com/questions/39789141/…

    – user7294900
    Dec 30 '18 at 12:22











  • There isn't way to get an item without modify selection ?

    – BitProgram
    Dec 30 '18 at 12:27











  • you can't select selected without selecting first

    – user7294900
    Dec 30 '18 at 12:30











  • @user7294900 I tried with try catch , but if I select another item catch again NullPointer Exception

    – BitProgram
    Dec 31 '18 at 0:59



















  • See stackoverflow.com/questions/39789141/…

    – user7294900
    Dec 30 '18 at 12:22











  • There isn't way to get an item without modify selection ?

    – BitProgram
    Dec 30 '18 at 12:27











  • you can't select selected without selecting first

    – user7294900
    Dec 30 '18 at 12:30











  • @user7294900 I tried with try catch , but if I select another item catch again NullPointer Exception

    – BitProgram
    Dec 31 '18 at 0:59

















See stackoverflow.com/questions/39789141/…

– user7294900
Dec 30 '18 at 12:22





See stackoverflow.com/questions/39789141/…

– user7294900
Dec 30 '18 at 12:22













There isn't way to get an item without modify selection ?

– BitProgram
Dec 30 '18 at 12:27





There isn't way to get an item without modify selection ?

– BitProgram
Dec 30 '18 at 12:27













you can't select selected without selecting first

– user7294900
Dec 30 '18 at 12:30





you can't select selected without selecting first

– user7294900
Dec 30 '18 at 12:30













@user7294900 I tried with try catch , but if I select another item catch again NullPointer Exception

– BitProgram
Dec 31 '18 at 0:59





@user7294900 I tried with try catch , but if I select another item catch again NullPointer Exception

– BitProgram
Dec 31 '18 at 0:59












1 Answer
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you can get the jcombox selected items like this.



String item = jcombox.getSelectedItem().toString ();



I Placed this code on onclick event of a button and it worked.






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    you can get the jcombox selected items like this.



    String item = jcombox.getSelectedItem().toString ();



    I Placed this code on onclick event of a button and it worked.






    share|improve this answer




























      0














      you can get the jcombox selected items like this.



      String item = jcombox.getSelectedItem().toString ();



      I Placed this code on onclick event of a button and it worked.






      share|improve this answer


























        0












        0








        0







        you can get the jcombox selected items like this.



        String item = jcombox.getSelectedItem().toString ();



        I Placed this code on onclick event of a button and it worked.






        share|improve this answer













        you can get the jcombox selected items like this.



        String item = jcombox.getSelectedItem().toString ();



        I Placed this code on onclick event of a button and it worked.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Dec 30 '18 at 15:53









        Habib MhamadiHabib Mhamadi

        357




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