java学习之—链表（4）

/**
 * 使用链表实现队列
 * Create by Administrator
 * 2018/6/19 0019
 * 下午 4:37
 **/
public class Link {
 
    public long dData;
    public Link next;
 
    public Link(long d){
        this.dData = d;
    }
 
    public void displayLink(){
        System.out.print(dData + " ");
    }
}
 
class SortList{
 
    private Link first;
 
    public SortList(){
        this.first = null;
    }
 
    public boolean isEmpty(){
        return first == null;
    }
 
    public void insertLast(long key){
        Link newLink = new Link(key);
        Link previous = null;
        Link current = first;
 
        while (current != null && key > current.dData){
            previous = current;
            current = current.next;
        }
        if(previous == null){
            first = newLink;
        }else{
            previous.next = newLink;
        }
        newLink.next = current;
    }
 
    public Link remove(){
        Link temp = first;
        first = first.next;
        return temp;
    }
 
    public void displayList(){
        Link current = first;
        while (current != null){
            current.displayLink();
            current = current.next;
        }
        System.out.println("");
    }
}
 
class LinkQueue{
    private FirstLastList theList;
 
    public LinkQueue(){
        this.theList = new FirstLastList();
    }
    public boolean isEmpty(){
        return theList.isEmpty();
    }
 
    public void insert(long j){
        theList.insertLast(j);
    }
 
    public long remove(){
        return theList.deleteFirst();
    }
 
    public void displayQueue(){
        System.out.print("Queue (front-->rear): ");
        theList.displayList();
    }
 
    public static void main(String[] args) {
        SortList sortList = new SortList();
        sortList.insertLast(40);
        sortList.insertLast(20);
 
        sortList.displayList();
 
        sortList.insertLast(10);
        sortList.insertLast(30);
        sortList.insertLast(50);
 
        sortList.displayList();
 
        sortList.remove();
 
        sortList.displayList();
 
    }
}