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i have a combobox.it has category name.so i need to pass string to category. Category category = (Category)cmbCategory.getSelectedItem(); this line get error saying cant cast string to category type..

private void btnSaveActionPerformed(java.awt.event.ActionEvent evt) {                                        
    // TODO add your handling code here:
    double amount = Double.parseDouble(txtAmount.getText());
    Expense expense = new Expense();
    expense.setReason(txtReason.getText());
    expense.setAmount(amount);
    DateFormat format = new SimpleDateFormat("MMMM d, yyyy");

    Category category = (Category)cmbCategory.getSelectedItem();
    String startDate = ((JTextField)txtDate.getDateEditor().getUiComponent()).getText();

    try {
        Date date = format.parse(startDate);
        expense.setDate(date);
    } catch (ParseException ex) {
        Logger.getLogger(ExpenseView.class.getName()).log(Level.SEVERE, null, ex);
    }

    expense.setCategory(category);
    ExpenseController.saveExpense(expense);
}
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  • is the type of cmbCategory.getSelectedItem(); String? Commented Sep 8, 2016 at 18:37
  • yes.i pass it as string Commented Sep 8, 2016 at 18:41
  • 1
    Well then that is you're problem. You are trying to tell the compiler that getSelectedItem() is going to give you a Category or subclass of Category, which String is not. Commented Sep 8, 2016 at 18:43
  • You might consider implementing some kind of Category.forName(String) method, which returns a Category based on the given String. Commented Sep 8, 2016 at 18:45
  • i need to pass it as category object to model->expense.java class.model->expense.java class has getter which accept category object.i need to pass as object including both valuemember and displaymember (name and id) of combo Commented Sep 8, 2016 at 18:53

2 Answers 2

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It looks like you are trying to convert and then assign a String to a Category.

Since String is not a Category obviously, nor implementing Category, you receive this exception.

You can add your Category class a string data member such as categoryNameand then set it as follows : 

Category category = new Category().setCategoryName(cmbCategory.getSelectedItem());
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5 Comments

thanks for help.it occured bcz i was trying to cast an instance of an Object to a type that it is not. now it ok
glad to hear, accept the answer for the future people looking at this question :)
i passed category object to comboadditem methode cmbCategory.addItem(category);.error solved.but when i run and looking at combobox it disappear name.i know problem is i passed category object.but category object has name and id.how i can display name in combo.
Can you provide a working example in Plnkr/JSFiddle? and as long as this post is solved please do open a new post for any further non-related questions
May I ask why did you took the accept down? as it does answer the question
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Category.getSelectedItem (); returns a String

unless it is assigned to an attribute of your class Category for example name and is of type string

category.setName(cmbCategory.getSelectedItem());
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thanks for help.it occured bcz i was trying to cast an instance of an Object to a type that it is not. now it ok

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