LinkedList主程序（是否可以要求用户输入数据并以linkedList的方式存储它…？）

Question

Below are my question

1. In an ArrayList we used below function to ask user to input 20 data, so, how to rewrite this ?
2. Function using the LinkedList method? 
3. Is it possible to ask user to input the data and stored it in a LinkedList way...? 

Code:

public static void main(String[] args) 
{ 
ArrayList al = new ArrayList(20); 
Scanner in = new Scanner(System.in); 
Student st; 
String name, id; 

float cgpa; 
for(int i=0; i<20; i++) 
{ 
System.out.println("Name : "); 
name = in.next(); 
System.out.println("ID : "); 
id = in.next(); 
System.out.println("CGPA : "); 
cgpa = in.nextFloat(); 

st = new Student(name, id, cgpa); 
al.add(i,st); 
}

Answer 1

这就是您所需要的：

LinkedList al = new LinkedList(); 

Answer 2

LinkedList also provides add method, which both the classes(ArrayList and LinkedList) overrides from List interface. So you just need to change the declaration of your list as mentioned here:

List al = new LinkedList(); 

Note the usage of List instead of LinkedList for reference. This allows to change the implentation list without changing much of your code.