Program 21.1: A String stack
Stacks in Java are a subclass of java.util.Vector, and they share with Vector the weakness of requiring the objects stored in the stack to be objects.
For example program 21.1 is a subclass of Stack that holds only Strings.
public class StringStack extends java.util.Stack {
public Object push(Object item)
super.push((String) item);
}
}
Copyright 1996, 2003 Elliotte Rusty Harold
elharo@metalab.unc.edu
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