Casting from Object [] to String [] gives ClassCastException
The method getStrings()
gives me ClassCastException
. Can anyone tell me how I can get the model? Thank!
public class HW3model extends DefaultListModel<String>
{
public HW3model()
{
super();
}
public void addString(String string)
{
addElement(string);
}
/**
* Get the array of strings in the model.
* @return
*/
public String[] getStrings()
{
return (String[])this.toArray();
}
}
The value returned toArray
is an array Object
.
That is, they are declared as Object[]
, not String[]
, and then flow back through Object[]
.
This means that you can never use it for an array String
, it is simply not valid.
You will have to copy the values yourself ... for example
public String[] getStrings()
Object[] oValues= toArray();
String[] sValues = new String[oValues.length];
for (int index = 0; index < oValues.length; index++) {
sValues[index] = oValues[index].toString();
}
return sValues;
}
You cannot cast one array to the type of another, so you will need to create your own array:
public String[] getStrings() {
String[] result = new String[getSize()];
copyInto(result);
return result;
}
try this and see if it works
String[] stringArrayX = Arrays.copyOf(objectArrayX, objectArrayX.length, String[].class);