I am trying to convert my code into generic and I get an error at o1 + o2 stating that cannot find symbol for o1 and o2 then bad operand types for binary operator on the push(pop()+ pop()).
public abstract class MyStackGeneric <E> extends ArrayList <E>
{
protected abstract E plus( E o1, E o2 );
public void push (E i)
{
add (i);
}
public E pop () throws java.util.EmptyStackException
{
return remove (size()-1);
}
public void print(){
ListIterator l = this.listIterator();
while(l.hasNext())
{
System.out.print( l.next() + ", " );
}
System.out.println();
}
public E plus(E o)
{
return o1 + o2; //error here
}
public void plus() throws ArithmeticException
{
if( size() < 2 ) throw new ArithmeticException("not enough element");
push(pop()+ pop());//error here
}
