first commit

tester/testsuite/extensions/objects1/linked.jl

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+class Node {
+  int elem;
+  Node next;
+
+  void setElem(int c) { elem = c; }
+
+  void setNext(Node n) { next = n; }
+
+  int getElem() { return elem; }
+
+  Node getNext() { return next; }
+}
+
+class Stack {
+  Node head;
+
+  void push(int c) {
+    Node newHead = new Node;
+    newHead.setElem(c);
+    newHead.setNext(head);
+    head = newHead;
+  }
+
+  boolean isEmpty() {
+    return head==(Node)null;
+  }
+
+  int top() {
+    return head.getElem();
+  }
+
+  void pop() {
+    head = head.getNext();
+  }
+}
+
+int main() {
+   Stack s = new Stack;
+   int i= 0;
+   while (i<10) {
+     s.push(i);
+     i++;
+   }
+     
+   while (!s.isEmpty()) {
+     printInt(s.top());
+     s.pop();
+   }
+   return 0;
+}