Ljava.lang.Object; cannot be cast to [Ljava.lang.Integer

Question

I have written a generic class and below is the constructor of the class. I want to do something like this as written in line

elements = (E[])new Object[siz         


        

Answer 1

Here is how you would fix it, you should not ever do (T[]) new Object[DEFAULT_CAPACITY]; instead an abstraction should be there for example (T[]) new Comparable[DEFAULT_CAPACITY];

public class ArrayStack> implements Stack {

private final int DEFAULT_CAPACITY = 50;

private int top;
private T[] elements;

@SuppressWarnings("unchecked")
public ArrayStack() {
    this.elements   = (T[]) new Comparable[DEFAULT_CAPACITY];
    this.top        = 0;
}
}