deletestudentnode.java

学生信息管理系统

/*
 * DeleteStudentNode.java
 *
 * Created on 2008年4月4日, 上午10:18
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package finaltest;

/**
 *
 * @author Administrator
 */
public class DeleteStudentNode {
    StudentNode mynode;
    static DeleteStudentNode deletemynode;
    /** Creates a new instance of DeleteStudentNode */
    public DeleteStudentNode(int index) {
        //mynode=StudentNode.head;
        mynode = StudentNode.getStudentNode(index);
        if(mynode==null){}
        else if(mynode==StudentNode.head && mynode==StudentNode.rear){
            StudentNode.head =null;
            StudentNode.rear =null;
            StudentNode.itemnow--;
        }else if(mynode==StudentNode.head){
            StudentNode.head =mynode.next;
            mynode.next =null;
            StudentNode.head.prev =null;
            StudentNode.itemnow--;
        }else if(mynode==StudentNode.rear){
            StudentNode.rear =mynode.prev;
            mynode.prev =null;
            StudentNode.rear.next =null;
            StudentNode.itemnow--;
        }else{
            mynode.prev.next =mynode.next;
            mynode.next.prev =mynode.prev;
            mynode.next =null;
            mynode.prev =null;
            StudentNode.itemnow--;
        }
    }
    
}