linked list new version.

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 class Sll{ // user defined data structure

    Node head;
    Node tail;
    int size;
void size(){
    System.out.println("length of list is="+size);
}
void deleteAtIndex(int ix){
if(ix<0 || ix>=size)
throw new IndexOutOfBoundsException("invalid index");
if(ix==0){
  deleteAtStart();
  return;
}
if(ix==size-1){
    deleteAtEnd();
    return;
}
Node x=head;
for(int i=0; i<ix-1; i++){
    x=x.next;
}
x.next=x.next.next;
size--;  
}
void deleteAtEnd(){
if(head==null)
    throw new IllegalStateException("list is already empty");
    if(head==tail){
        head=tail=null;
        size--;
        return;
    }
    Node x=head;
    while(x.next!=tail){
    x=x.next;
    }
    tail=x;
    x.next=null;
    size--;  
}
void deleteAtStart(){
    if(head==null)
    throw new IllegalStateException("list is already empty");
    if(head==tail){
        head=tail=null;
        size--;
        return;
    }
    head=head.next;
    size--;
}
void setElementAtIndex(int ix, int val){
if(ix<0 || ix>=size)
throw new IndexOutOfBoundsException("invalid index");
if(ix==0){
 head.val=val;
 return;
}
if(ix==size-1){
 tail.val=val;
 return;
}
Node x=head;
for(int i=0; i<ix; i++){
    x=x.next;
}
 x.val=val;
}
int getElementAtIndex(int ix){
if(ix<0 || ix>=size)
throw new IndexOutOfBoundsException("invalid index");
if(ix==0)
    return head.val;
if(ix==size-1)
    return tail.val;
Node x=head;
for(int i=0; i<ix; i++){
    x=x.next;
}
return x.val;
}
void insertAtIndex(int ix,int val){
if(ix<0 || ix>size)
throw new IndexOutOfBoundsException("invalid index");
if(ix==0){
    insertAtStart(val);
    return;
}
if(ix==size){
insertAtEnd(val);
return;
}
Node temp = new Node(val);
Node x=head;
for(int i=0; i<ix-1; i++){
x=x.next;
}
temp.next=x.next;
x.next=temp;
size++;
}
void insertAtStart(int val){
Node temp=new Node(val);
if(head==null){
    head=tail=temp;
    size++;
    return;
}
temp.next=head;
head=temp;
size++;
}
void insertAtEnd(int val){
Node temp = new Node(val);
if(head==null){
    head=tail=temp;
    size++;
    return;
}
tail.next=temp;
tail=temp;
size++;
}
void print(){
    Node temp=head;
    while(temp!=null){
    System.out.print(temp.val+" ");
    temp=temp.next;
    }
    System.out.println();
}
}
public class Implementation {
public static void main(String[] args) {
Sll l = new Sll();
}  
}
===================================================================================
class Node {
    int val;
    Node next;
    Node(int val){
        this.val=val;
    }
}
public class ListNodeClass {
    public static void printRevRec(Node head){
    if(head==null)
        return;
    printRevRec(head.next);
    System.out.print(head.val+" ");
    }
    public static void Print(Node head){
        Node temp=head;
        while(temp!=null){
            System.out.print(temp.val+" ");
            temp=temp.next;
        }
        System.out.println();
    }
    public static void printRec(Node head){
    if(head==null)
        return;
    System.out.print(head.val+" ");
    printRec(head.next);
    }
    public static void main(String[] args) {
    Node a = new Node(10);
    Node b = new Node(20);
    Node c = new Node(30);
    Node d = new Node(40);
    Node e = new Node(50);
    a.next=b; b.next=c;
    c.next=d; d.next=e;
    // System.out.print(a.val+" ");
    // System.out.print(b.val+" ");
    // System.out.print(c.val+" ");
    // System.out.print(d.val+" ");
    // System.out.print(e.val+" ");


    // System.out.println(a.val);
    // System.out.println(a.next.val);
    // System.out.println(a.next.next.val);
    // System.out.println(a.next.next.next.val);
    // System.out.println(a.next.next.next.next.val);

    //printRec(a);
    //Print(a);
    printRevRec(a);
    }
}

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