Where is array's length property defined?

Question

We can determine the length of an ArrayList using its public method size(), like

ArrayList arr = new ArrayL         


        

Answer 1

it's public final field , which contains the number of components of the array (length may be positive or zero)

An array thus has the same public fields and methods as the following class:

class A implements Cloneable, java.io.Serializable {
    public final int length = X;
    public Object clone() {
        try {
            return super.clone();
        } catch (CloneNotSupportedException e) {
            throw new InternalError(e.getMessage());
        }
    }
}

more info at

10.7 Array Members

http://java.sun.com/docs/books/jls/second_edition/html/arrays.doc.html