lecture 3

I described up to postfix using arrays assignment (#4).

int x[] = new int[100];

for (int i = 0; i< x.length; i++)
System.out.println(x[i]);

for (int p : x)
System.out.println(p);

interfaces
Iterable
Iterator

when I implement Iterable, I must provide a
method called iterator()

iterator returns Iterator

anything implementing Iterator must provide
boolean hasNext()

next()

int x[] = new int[100];
Iterator i = x.iterator();
while(i.hasNext())
{
int p = i.next();
System.out.println(p);
}


syntactic sugar