Java数据结构——链表-单链表

<1>链表

<2>引用和基本类型

<3>单链表

//=================================================
// File Name       :	LinkList_demo
//------------------------------------------------------------------------------
// Author          :	Common

//类名：Link
//属性：
//方法：
class Link{			//链节点类
	public int iData;
	public double dData;
	public Link next;				//链表中下一个节点的引用

	public Link(int iData, double dData) {
		super();
		this.iData = iData;
		this.dData = dData;
	}

	public void displayLink(){			//显示当前节点的值
		System.out.println("iData="+iData+","+"dData"+dData);
	}

}

//类名：LinkList
//属性：
//方法：
class LinkList{
	private Link first;			//只需要第一个节点，从第一个节点出发即可定位所有节点

	public LinkList() {			//构造函数
		this.first = null;
	}

	public boolean isEmpty(){
		return (first == null);
	}

	public void insertFirst(int id,double dd){		//插入元素是从链表的头开始插入
		Link newLink = new Link(id,dd);
		newLink.next = first;
		first = newLink;
	}

	public Link deleteFirst(){
		Link temp = first;		//暂存first
		first = first.next;			//把next设为first
		return temp;				//返回原来的first
	}

	public void displayList(){
		System.out.println("List(first-->last):");
		Link current = first;			//用于不断改变位置实现遍历
		while(current != null){
			current.displayLink();
			current = current.next;
		}
	}
}

//主类
//Function        : 	LinkList_demo
public class LinkList_demo {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		LinkList theList = new LinkList();
		theList.insertFirst(11, 11.1);
		theList.insertFirst(22, 22.2);
		theList.insertFirst(33, 33.3);
		theList.insertFirst(44, 44.4);
		theList.insertFirst(55, 55.5);
		theList.displayList();
		while(!theList.isEmpty()){
			Link aLink = theList.deleteFirst();
			System.out.print("delete:");
			aLink.displayLink();
		}
		theList.displayList();
	}

}

//=================================================
// File Name       :	LinkList_demo
//------------------------------------------------------------------------------
// Author          :	Common

//类名：Link
//属性：
//方法：
class Link{			//链节点类
	public int iData;
	public double dData;
	public Link next;				//链表中下一个节点的引用

	public Link(int iData, double dData) {
		super();
		this.iData = iData;
		this.dData = dData;
	}

	public void displayLink(){			//显示当前节点的值
		System.out.println("iData="+iData+","+"dData"+dData);
	}

}

//类名：LinkList
//属性：
//方法：
class LinkList{
	private Link first;			//只需要第一个节点，从第一个节点出发即可定位所有节点

	public LinkList() {			//构造函数
		this.first = null;
	}

	public boolean isEmpty(){
		return (first == null);
	}

	public void insertFirst(int id,double dd){		//插入元素是从链表的头开始插入
		Link newLink = new Link(id,dd);
		newLink.next = first;
		first = newLink;
	}

	public Link deleteFirst(){
		Link temp = first;		//暂存first
		first = first.next;			//把next设为first
		return temp;				//返回原来的first
	}

	public void displayList(){
		System.out.println("List(first-->last):");
		Link current = first;			//用于不断改变位置实现遍历
		while(current != null){
			current.displayLink();
			current = current.next;
		}
	}

	public Link find(int key){					//查找指定的关键字
		Link current = first;
		while(current.iData != key){
			if(current.next == null)
				return null;
			else
				current = current.next;
		}
		return current;
	}

	public Link delete(int key){			//如果current的值匹配，则删除
		Link current = first;
		Link previous = first;
		//没有匹配到值
		while(current.iData != key){
			if(current.next == null)
				return null;
			else{							//pre和cur向后移动
				previous = current;
				current = current.next;
			}
		}
		//匹配到值
		if(current == first)		//只有一个first，并匹配，则把first设成first.next
			first = first.next;
		else								//current的值匹配，则删除，并把cur的next赋给pre的next
			previous.next = current.next;
		return current;
	}
}

//主类
//Function        : 	LinkList_demo
public class LinkList_demo {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		LinkList theList = new LinkList();
		theList.insertFirst(11, 11.1);
		theList.insertFirst(22, 22.2);
		theList.insertFirst(33, 33.3);
		theList.insertFirst(44, 44.4);
		theList.insertFirst(55, 55.5);
		theList.displayList();

		Link f = theList.find(22);
		if(f != null){
			System.out.print("找到：");
			f.displayLink();
		}
		else
			System.out.print("没有找到");

		Link d = theList.delete(32);
		if(d != null){
			System.out.print("删除：");
			d.displayLink();
		}
		else
			System.out.print("没有找到匹配的删除");

	}

}