Object修改链表

以前学习过链表的时候由于类型的接收不同，每次要重写链表

下面修改可用链表

class Link{
 
    private class Node{
        private Object data ;
        private Node next ;
 
        public Node (Object data){
            this.data = data ;
        }
        public void add(Node newNode){
            if(this.next  == null)
                this.next = newNode;
            else{
                this.next.add(newNode) ;
            }
        }
        public void print(){
            System.out.println(this.data) ;
            if(this.next == null)
                return ;
            else {
                this.next.print() ;
            }
        }
        public boolean containsNode(Object data){
            if(data.equals(this.data))
                return true;
            else {
                if(this.next != null)
                    return this.next.containsNode(data);
                else
                    return false ;
            }
 
        }
        public Object getNode(int index){
             if(Link.this.foot ++ == index){
                return this.data ;
             } else {
                return this.next.getNode(index) ;
             }
        }
        public void setNode(int index ,Object data){
            if(Link.this.foot ++ == index){
                this.data = data ;
 
            }
            else{
                this.next.setNode(index,data) ;
            }
        }
        public void removeNode(Node previous ,Object data) {
            if(data.equals(this.data)){
                previous.next = this.next ;
            } else {
 
                    this.next.removeNode(this,data) ;
 
            }
        }
        public void toArrayNode(){
            Link.this.retArray[Link.this.foot ++ ] = this.data ;
            if(this.next != null)
                this.next.toArrayNode() ;
        }
    }
    private Node root ;
    private int count = 0 ;
    private int foot = 0 ;
    private Object [] retArray ;
    public void add(Object data){
 
        if(data == null)
            return ;
 
        Node newNode = new Node(data) ;
 
        if (root == null)
            root = newNode;
        else {
            this.root.add(newNode) ;
        }
        this.count ++ ;
    }
    public void print(){
        this.foot = 0 ;
        if(root == null)
            return ;
        else{
            root.print() ;
        }
    }
    public int size() {
           return this.count ;
    }
    public boolean isEmpty(){
        return this.count == 0 ;
    }
    public boolean contains(Object data) {
        if(this.root == null || data == null)
            return false ;
        else {
            return this.root.containsNode(data) ;
        }
    }
    public Object get(int index){
        if(index > this.count)
            return null ;
        else{
            return this.root.getNode(index) ;
        }
 
    }
    public void set(int index , Object data) {
        if(index > this.count)
            return  ;
        else{
            this.foot = 0 ;
            this.root.setNode(index,data) ;
        }
 
    }
    public void remove(Object data){
        if(this.contains(data)){
            if(data.equals(this.root.data))
                   this.root = this.root.next ;
            else{
                this.root.next.removeNode(root,data) ;
            }
 
        }
    }
    public Object [] toArray(){
        if(this.root == null){
            return null ;
        } else {
            this.foot = 0 ;
            this.retArray = new Object[this.count] ;
            this.root.toArrayNode() ;
            return this.retArray ;
        }
    }
 
}
 
public class Link1{
    public static void main(String args[]){
        Link all = new Link() ;
        all.add("A") ; //String转为Object
        all.add("B") ;
        all.add("C") ;
        all.remove("A") ;//String已经覆写了equals（）方法
        Object [] data = all.toArray();
        for(int x = 0 ; x < data.length ; x ++){
            String str = (String)data[x] ; //每一个对象向下转型 Object变为String
            System.out.println(str) ;
        }
 
    }
 
}

总结：

Object类对象可以接受一切数据类型，解决了数据统一问题