和C++并没有差别不大，主要是指针改为了引用变量，其他的链式结构基本可以参照这个

至于树的话注意下递归就大致可以了

package com.sun.study.test;

class Link{
	
	public int data;
	public Link next;
	
	public Link(int data) {
		this.data = data;
	}
	
	public void display(){
		System.out.println("数据为："+data);
	}
	
}

class LinkList{
	
	private Link first;
	
	public LinkList(){
		first=null;
	}
	
	public boolean isEmpty(){
		return(first == null);
	}
	
	public void insert(int data){
		Link newLink = new Link(data);
		newLink.next = first;
		first = newLink;
	}
	
	public void delete(int data){
		Link current = first;
		Link del = null;
		for(;current!=null;current=current.next){
			if(current.next.data == data){
				del=current.next;
				current.next = del.next;
				break;
			}
		}		
		
		
	}
	
	public void display(){
		Link current= first;
		for(;current != null;current = current.next)
			System.out.println(current.data);
	}
	
}

class LinkListApp{
	
	public static void main(String[] args){
		LinkList list = new LinkList();
		
		list.insert(88);
		list.insert(45);
		list.insert(85);
		list.insert(90);
		list.insert(8);
		list.insert(4);
		list.insert(5);
		list.insert(9);
		
		System.out.println(list.isEmpty());
		list.display();
		System.out.println("---------------");
		
		System.out.println(list.isEmpty());
		list.delete(90);
		list.display();
		
		
		
	}		
	
}