java 如何将 ComboBox.SelectedItem() 转换为 int？
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How to cast a ComboBox.SelectedItem() to int?
提问by alin
I try to cast a ComboBox.SelectedItem() to int and it isn't working. I know that ComboBox.SelectedItem() has the type String and I casted it like this:
我尝试将 ComboBox.SelectedItem() 转换为 int 并且它不起作用。我知道 ComboBox.SelectedItem() 具有 String 类型，我像这样投射它：
int idprovider = ((Integer)IdProviderComboBox.getSelectedItem()).intValue();
but I get the error: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer
但我收到错误：java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer
Maybe someone has an idea. Thanks!
也许有人有想法。谢谢！
回答by mprabhat
You are casting String to Integer hence its throwing ClassCastException, to get int out of a String use one of the following:
您将 String 转换为 Integer，因此它会抛出 ClassCastException，要从 String 中获取 int，请使用以下方法之一：
Update:
更新：
JComboBox.getSelectedItem() will return you Object, to covert it to int use :
JComboBox.getSelectedItem() 将返回您的对象，将其转换为 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
