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/** * Write a description of class IntSLList here. *  * @author (your name)  * @version (a version number or a date) */public class IntSLList {    private IntNode head, tail;    public IntSLList(){        head = tail = null;    }        public void addToTail(int number) {        if ( head == null)  {            head = tail = new IntNode(number);        }        else {            tail.next = new IntNode(number);            tail = tail.next;          }    }        public void addToHead(int number) {        head = new IntNode(number,head);        if (tail == null)            tail = head;	}        public int length()    {        int length = 1;        if( head == null )        {            return 0;        }        IntNode temp;        for( temp = head.next; temp != null; temp = temp.next )        {            length += 1;        }        return length;    }        public void addNode( int number , int place )    {        if( length() < place )        {            addToTail( number );        }        else        {            IntNode temp = head;            for( int i = 1; i < place; i++)            {                temp = temp.next;             }            temp = new IntNode(number,temp);        }    }        public void print()    {        IntNode temp = head;        for( int i = 0; i < length(); i++ )       {           System.out.print(temp.info + ", ");           temp = temp.next;        }    }            }///////////////////////////////////////////////////////////////////////public class IntNode  { public int info;public IntNode next;public IntNode (int i) { // constructor 1     this(i,null);}public IntNode (int i, IntNode n) { // constructor 2info = i;next = n;	}}///////////////////////////////////////////////////////////////////////