userlinklist.java

基于netbeans的java桌面应用程序合集

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package org.Adam;

/**
 *
 * @author Administrator
 */
public class UserLinkList {
Node root;
    Node printer;
    int count;
    public UserLinkList() {
        root=new Node();
        root.next=null;
        printer=null;
        count=0;
    }
    //Delete User
    public void DeleteUser(Node n){
        printer=root;
        while(printer.next!=null){
            if(printer.next==n){
                printer.next=n.next;
                count--;
                break;
            }
            printer=printer.next;
        }        
    }
    //Add User
    public void AddUser(Node n){
        printer=root;
        while(printer.next!=null){
            printer=printer.next;
        }
        printer.next=n;
        n.next=null;
        count++;
    }
    //Return UserList
     public int getCount(){
        return count;
    }
    //find user by username
    public Node findUser(String username){
        if(count==0)
        return null;
        printer=root;
        while(printer.next!=null){
            printer=printer.next;
            if(printer.username.equalsIgnoreCase(username)){
                return printer;
            }
        }
        return null;
    }
    //find user by index
    public Node findUser(int index){
        if(count==0)
        return null;
        if(count<0)
        return null;
        printer=root;
        int i=0;
        while(i<index+1){
            if(printer.next!=null){
                printer=printer.next;               
            }else{
                return null;
            }
            i++;
        }
        return printer;
    }
}