java.lang.UnsupportedOperationException：

在这个程序中，我将属性存储到arraylist

public static void main(String [] args) throws Exception{
Property property1 = new Property(24,"Boston Australia",3,45,67);

        Property property2 = new Property(24,"Boston Malvern",3,45,67);
        Property property3 = new Property(24,"Boston Caulfield",3,45,67);
        Property property4 = new Property(24,"Boston Caulfield",3,45,67);
        Property property5 = new Property(24,"Boston Caulfield",3,45,67);
        SimplePropertyRepositoryImpl sl;
        sl = new SimplePropertyRepositoryImpl();
        sl.addProperty(property1);
        sl.addProperty(property2);
        sl.addProperty(property3);
        sl.addProperty(property4);
        sl.addProperty(property5);
}

public class SimplePropertyRepositoryImpl implements PropertyRepository{
    ArrayList<Property> properties;

    public SimplePropertyRepositoryImpl(){
        properties = new ArrayList<>();

    }
    @Override
    public void addProperty(Property property) throws Exception {

         properties.add(property);


        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.

    }

SimplePropertyRepositoryImpl有一个addProperty方法，我在其中将property对象添加到arraylist

public static void main(String [] args) throws Exception{
Property property1 = new Property(24,"Boston Australia",3,45,67);

        Property property2 = new Property(24,"Boston Malvern",3,45,67);
        Property property3 = new Property(24,"Boston Caulfield",3,45,67);
        Property property4 = new Property(24,"Boston Caulfield",3,45,67);
        Property property5 = new Property(24,"Boston Caulfield",3,45,67);
        SimplePropertyRepositoryImpl sl;
        sl = new SimplePropertyRepositoryImpl();
        sl.addProperty(property1);
        sl.addProperty(property2);
        sl.addProperty(property3);
        sl.addProperty(property4);
        sl.addProperty(property5);
}

public class SimplePropertyRepositoryImpl implements PropertyRepository{
    ArrayList<Property> properties;

    public SimplePropertyRepositoryImpl(){
        properties = new ArrayList<>();

    }
    @Override
    public void addProperty(Property property) throws Exception {

         properties.add(property);


        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.

    }

---

请帮助我理解，当我没有使用任何不可修改的集合时，为什么会出现此异常。

在

addProperty

中删除无条件的

抛出。大概

public void addProperty(Property property) throws Exception {
     properties.add(property);
     // throw new UnsupportedOperationException("Not supported yet.");
}

由于上述
抛出
未被注释掉，因此
抛出
的
UnsupportedOperationException
抛出新的UnsupportedOperationException（“尚不受支持”）-代码完全按照要求执行；异常跟踪准确地指出了它被写入的位置-
。在SimplePropertyRepositoryImpl.addProperty..（第29行）