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| 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);
}
}
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;
}
}
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");
}
}
|
