linklistapp.java

来自「初学java的一个简单的作业题」· Java 代码 · 共 165 行

//linkList.java
///////////////////////////////////
import java.io.*;
import java.util.*;
//-------------------------------------
class Link{
	public String name;
	public int num;
	public double price;
	public String ID;
	public Link next;
	//-----------------------------------
	public Link(){}
	//-----------------------------------
	public Link(String aname,int anum, double aprice,String aID){
		name=aname;
		num=anum;
		price=aprice;
		ID=aID;
	}
	//----------------------------------
	public void GenerateLink() throws IOException{
		System.out.println("*************根据提示信息输入***********");
		
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		
		System.out.print("输入订票人姓名: ");
		name=br.readLine();
		System.out.print("输入想订票张数: ");
		num=Integer.parseInt(br.readLine());
		System.out.print("输入所订票价格: ");
		price=Double.parseDouble(br.readLine());
		System.out.print("输入订票人证件号码: ");
		ID=br.readLine();
		
		Link aLink=new Link(name,num,price,ID);
		
	}
	//----------------------------------
	public void displayLink(){
		System.out.print("{"+name+","+num+","+price+","+ID+"}");
	}
}
///////////////////////////////////////
class LinkList{
	private Link first;
	//---------------------------------
	public LinkList(){
		first=new Link();
		first.next=null;
	}
	//---------------------------------
	public boolean isEmpty(){
		return(first==null);
	}
	//----------------------------------
	public void insertFirst(Link newLink) throws IOException{

		newLink.next=first.next;
		first.next=newLink;
	}
	//-----------------------------------
	public Link delete(String name){
		Link current=first.next;
		Link previous=first;
		if(current==null){
  		  	System.out.println("nothing can be deleted!");
  		  	return null;	
  		}
  		else{
     		while(current!=null&&!name.equals(current.name))	{
  				previous=current;
  	  			current=current.next;
  	  		}
    		if(current==null){
  	  			System.out.println("Nothing can be deleted!!");
  	  			return null;	
  	  		}
  	 		else
    			previous.next=current.next;	
  		}
		return current;	
	}
//-----------------------------------
	public void displayList(){
		System.out.print("List (first-->last): ");
		Link current=first;
		while(current!=null){
			current.displayLink();
			current=current.next;
		}
		System.out.println("");
	}
}
///////////////////////////////////////
class LinkListApp {
	public static void main(String[] args)throws IOException{
		int totalNum=0;
		double totalMoney=0;
	
		LinkList theList=new LinkList();	
		
		while(true){
		new Menu();		
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		int choice=Integer.parseInt(br.readLine());
		if(choice==1){
			while(true){		
				Link newLink = new Link();
				newLink.GenerateLink();
				theList.insertFirst(newLink);
				totalNum+=newLink.num;
				totalMoney+=newLink.price*newLink.num;
				theList.displayList();
				System.out.println("go on adding?(y of Y): ");
				if(br.readLine().equalsIgnoreCase("y"))	continue;
				else{
					System.out.println("By far the total numbers of tickets is: "+totalNum);
					System.out.println("By far the total money of tickets is: "+totalMoney);
					break;
				}			
			}
		}
		else if(choice==2){	
			try{ 
				while(true){
					System.out.print("Input the name you want to delete: ");
					String key=br.readLine();
					Link temp=new Link();
					temp=theList.delete(key);
					totalNum-=temp.num;
					totalMoney-=temp.price*temp.num;
					System.out.println("By far the total numbers of tickets is: "+totalNum);
					System.out.println("By far the total money of tickets is: "+totalMoney);
					theList.displayList();
					System.out.println("go on deleting?(y of Y): ");
					if(br.readLine().equalsIgnoreCase("y"))	continue;
					else break;
				}
				continue;
			}catch(NullPointerException exc){
				System.out.println("there is no link error!");
			}
		}
		else if(choice==0)	
			System.exit(0);
		else{
			System.out.println("choice not exist!choose again!");
			continue;
		} 

		}	
	}
}
//////////////////////////////////////////////
class Menu {
	//--------------------------------------
	Menu(){
		System.out.println("**********欢迎光临航空订票系统*********");
		System.out.println("///////////选择1添加订票信息///////////");
		System.out.println("///////////选择2删除订票信息///////////");
		System.out.println("///////////选择0退出订票系统///////////");
		System.out.println("***************************************");
	}
}