将 ArrayList 转换为 Array 抛出 java.lang.ArrayStoreException
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Convert ArrayList to Array throws java.lang.ArrayStoreException
提问by Hoggie1790
i have a method convertToArray()which converts an ArrayListto an array. I want to call this method every time an element is added to the ArrayList.
我有一个convertToArray()将 an 转换ArrayList为数组的方法。每次将元素添加到ArrayList.
public class Table extends ArrayList<Row>
{
public String appArray[]; //Array of single applicant details
public String tableArray[][]; //Array of every applicant
/**
* Constructor for objects of class Table
*/
public Table()
{
}
public void addApplicant(Row app)
{
add(app);
convertToArray();
}
public void convertToArray()
{
int x = size();
appArray=toArray(new String[x]);
}
}
}
When i call the addApplication(Row app)method I get the error: java.lang.ArrayStoreException
当我调用该addApplication(Row app)方法时，出现错误：java.lang.ArrayStoreException
So I changed my addApplicant()method to:
所以我改变了我的addApplicant()方法：
public void addApplicant(Row app)
{
add(app);
if (size() != 0)
convertToArray();
}
I get the same error message. Any ideas why? I figured if it checks the ArrayListhas elements before converting it the error should not be thrown?
我收到相同的错误消息。任何想法为什么？我想如果它ArrayList在转换之前检查has 元素，不应该抛出错误？
I can provide the full error if needed
如果需要，我可以提供完整的错误
回答by Anton-M
ArrayStoreException thrown to indicate that an attempt has been made to store the wrong type of object into an array of objects.
抛出 ArrayStoreException 以指示已尝试将错误类型的对象存储到对象数组中。
So,
所以，
public Row[] appArray; // Row - because you extend ArrayList<Row>
public void convertToArray()
{
int x = size();
appArray = toArray(new Row[x]);
}
