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 PackageCom.lanyuan.log; Public classTest1 {Privatetnode Head; Private intsize; PrivateTnode last;  Public intsize () {return  This. Size + 1; }     PublicTest1 () {head= last =NULL; }     Public voidAddintval) {tnode node=NewTnode (Val); if(Head = =NULL) {Head= last =node; Last.next=Head; } Else{Last.next=node; Last=Last.next; Last.next=Head; } size++; }     Public intDeletelast () {if(Head = =NULL) {            Throw NewRuntimeException ("It ' s not allow"); } tnode Node=Head.next; intval =Last.val;  for(inti = 0; Node! =NULL&& Node.next! = Last; i++) {node=Node.next; } size--; Last.next=node; Last=Last.next; Last.next=Head; returnVal; }     Public BooleanUpdaetlast (intval) {        if(Head = =NULL) {            Throw NewRuntimeException ("It ' s not allow"); } last.val=Val; returnLast! =NULL; }     Public intFindLast () {if(Head = =NULL) {            Throw NewRuntimeException ("It ' s not allow"); }        returnLast.val; }     PublicString toString () {if(Head = =NULL) {            return"Tlink[]"; } StringBuilder SB=NewStringBuilder (); Tnode node=Head.next; Sb.append ("Tlink[" +head.val);  for(inti = 0; I < size && node! = head; i++) {sb.append ("," +node.val); Node=Node.next; } sb.append ("]"); returnsb.tostring (); }}classTnode {//to simply store int type data here, you can change to generics     Public intVal;  PublicTnode Next;  Publictnode () {Super(); }     PublicTnode (intval) {         This. val =Val; }}

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