java.lang.System.arraycopy的java.lang.ArrayStoreException（Native方法）

Question

        int toSize=toMailIds.size();
        InternetAddress[] address=new InternetAddress[toSize];
        address=toMailIds.toArray(address);

Here toMailIds is arraylist.

Iam getting the following exception.

java.lang.ArrayStoreException

Answer 1

You are going to have to use a loop in this case:

int toSize=toMailIds.size();
InternetAddress[] address=new InternetAddress[toSize];

for (int i = 0; i < toSize; i++) {
    address[i] = new InternetAddress(toMailIds.get(i));
}

If a list stores Strings, the toArray method will not create InternetAddress objects from them automatically.

Answer 2

address=toMailIds.toArray() ; is enough here. But type of address array should be Object[]

Example

List<String> list=new ArrayList<>();
Object[] atr=list.toArray();