Question

i created a class derived of Object and I have a object array.
how to do cast object array to my class array?

public class CastArray{

public CastArray(){
}

public long toLong(){
    return Long.parseLong(this.toString());
}    

public double toDouble(){
    return Double.parseDouble(this.toString());
}

public int toInteger(){
    return Integer.parseInt(this.toString());
}
}<br />

return Error:
java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [LBasic.CastArray;

Answer 1

The question is a bit vague but let me make an attempt to answer it. if the object array is actually an array of your class, you can do a direct cast to your array e.g. A[] a = (A[]) objArray;. Alternatively, if you know that each element can be cast into your class (is an instance of your class or one of its sub classes), you can clone it by creating a new array and adding each element with a cast to your class. e.g.:

A[] a = new A[objArray.length];
int i = 0;
for (Object o : objArray) {
   a[i++] = (A) o;
}