我试图将一个 ComboBox. Sectivetems () 投进其中, 它没有起作用。 我知道 ComboBox. SectiveTroject () 具有字符串类型, 我像这样投入 :
int idprovider = ((Integer)IdProviderComboBox.getSelectedItem()).intValue();
but I get the error: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer
Maybe someone has an idea. Thanks!
您正在将字符串投入整数, 从而将其抛出类 Cast 例外, 以便从字符串中取出, 使用以下方法之一 :
更新 :
JComboBox.getSectiveLited() 将会返回对象, 以隐藏到 Int 使用 :
int idprovider = Integer.valueOf((String)IdProviderComboBox.getSelectedItem()); // Internally calls parseInt, returns Integer, Java converts it to int for you.
int idprovider = Integer.parseInt((String)IdProviderComboBox.getSelectedItem()); // Since you need int use this better
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