BasicComboBoxEditor.java 文件源码

public Object getItem() {
    Object newValue = editor.getText();

    if (oldValue != null && !(oldValue instanceof String))  {
        // The original value is not a string. Should return the value in it's
        // original type.
        if (newValue.equals(oldValue.toString()))  {
            return oldValue;
        } else {
            // Must take the value from the editor and get the value and cast it to the new type.
            Class<?> cls = oldValue.getClass();
            try {
                Method method = MethodUtil.getMethod(cls, "valueOf", new Class[]{String.class});
                newValue = MethodUtil.invoke(method, oldValue, new Object[] { editor.getText()});
            } catch (Exception ex) {
                // Fail silently and return the newValue (a String object)
            }
        }
    }
    return newValue;
}