/media/sda-magnetic/david/Dokumente-15/fernuni-hagen/cs-i-ii/old-cs-2-03/java-new/2020-11-23/ParamStackProgTest.java

class ParamStackProgTest {
    public static void main (String [] args) {
        ParamStack <String> stck = new ParamStack <String> (args[0]);
        int i;
        
        for (i = 1;  i < args.length;  i++)
            stck.put (args[i]);
        
        for (i = 0;  i < args.length + 4;  i++)
            System.out.println (stck.get());
    }
    
    static class ParamStack <P> {
        P v;
        ParamStack <P> n;
        
        ParamStack (P v) {
            this.v = v;
            this.n = null;
        }
        
        void put (P v) {
            ParamStack <P> ptr = new ParamStack (v);
            ptr.n = this.n;
            this.n = ptr;
        }
        
        P get () {
            P v;
            if (this.n == null) 
                v = this.v;
            else {
                v = this.n.v;
                this.n = this.n.n;
            }
            return v;
        }
    
    }

}