java@ LinkedList 学习

package abc.com;

import java.util.LinkedList;

public class TestLinkedList {
    
    static void prt(Object o) {
        System.out.print(o);
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        
        LinkedList<Character> books = new LinkedList<Character>();
        
        books.offerFirst('a');
        books.offerLast('b');
        books.offerLast('c');
        books.offerFirst('d');
        
        for(int i=0;i<books.size();++i) {
            prt(books.get(i));
        }prt("\n");
        
        prt(books.peekFirst() + "\n");
        
        prt(books.peekLast() + "\n");
        
        prt(books); books.pollFirst(); prt(books);
        
        prt(books); books.pollLast(); prt(books);
        
    }

}

运行结果:
dabc
d
c
[d, a, b, c]    [a, b, c]
[a, b, c]    [a, b]