public class DBLink {          public class DBLinkList {         private int value;         private DBLinkList pre;         private DBLinkList next;                  public int getValue() {             return value;         }         public void setValue(int value) {             this.value = value;         }         public DBLinkList getPre() {             return pre;         }         public void setPre(DBLinkList pre) {             this.pre = pre;         }         public DBLinkList getNext() {             return next;         }         public void setNext(DBLinkList next) {             this.next = next;         }     }          public DBLinkList insertELeDbLinkList(DBLinkList pHead, int pos, int data) {         DBLinkList temp = new DBLinkList();         if (pos==1) {             temp.setValue(data);             temp.setNext(pHead);             pHead.setPre(temp);             return temp;         } else {             for (int i=1; i<pos-1;i++) {                 temp = pHead;                 if (temp.getNext()==null) {                     return null;                 }                 pHead = temp.getNext();             }             DBLinkList insertLink = new DBLinkList();             insertLink.setValue(data);             insertLink.setPre(temp);             insertLink.setNext(pHead);             return insertLink;         }     }     public static void main (String args[]) {     } }