链表总结实践1

package 链表实践;

public class Link {

    public long dData;
    public Link next;
    
    public Link(long dd)
    {
        dData = dd;
    }
    
    public void displayLink()
    {
        System.out.print(dData+"  ");
    }
    
}
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package 链表实践;

public class SortedList {

    private Link first;
    public SortedList()
    {
        first = null;
    }
    
    //判断是不是为空
    public boolean isEmpty()
    {
        if(first == null){
            return true;
        }else{
            return false;
        }
    }
    
    //插入链表的方法的实现
    public void insert(long key)
    {
        Link newLink = new Link(key);
        Link previous = null;//从first开始
        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()
    {
         System.out.print("List (first-->last): ");  
            Link current = first; // start at beginning of list  
            while (current != null) // until end of list,  
            {  
                current.displayLink(); // print data  
                current = current.next; // move to next link  
            }  
            System.out.println("");  
    }
    
    
}
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package 链表实践;

public class PriorityQ {

      private SortedList sortedList;  
      
        public PriorityQ() {  
            sortedList = new SortedList();  
        }  
      
        public void insert(long item) {  
            sortedList.insert(item);  
        }  
      
        public long remove() {  
            return sortedList.remove().dData;  
        }  
      
        public boolean isEmpty() {  
            return sortedList.isEmpty();  
        }  
      
        public void display() {  
            sortedList.displayList();  
        }  
}