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public class StackOfStrings {
private class Node {
String item;
Node next;
}
private Node first = null;
private int size = 0;
public boolean isEmpty() {
return first == null;
}
/*
public void STackOfStrings() {
}
*/
public void push(String item) {
Node oldfirst = first;
first = new Node();
first.item = item;
first.next = oldfirst;
size++;
}
public String pop() {
String i = first.item;
first = first.next;
size--;
return i;
}
public int size() {
return size;
}
}
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