LinkedList 方法吐血大汇总

Posted 2022-12-11 _大木_

耍起来

package com.beyond;

import java.util.*;

public class LinkedListTest 
    public static void main(String[] args) 
        List<Integer> list = new LinkedList<>();
        List<Integer> list1 = new ArrayList<>();
        list1.add(1);
        list1.add(2);
        list1.add(3);
        list.add(3);
        list.add(9);
        System.out.println(list);
        list.add(0,4);
        System.out.println(list);
        list.addAll(list1);
        list.addAll(2,list1);
        System.out.println(list);

        ((LinkedList<Integer>) list).addFirst(2);
        System.out.println(list);
        ((LinkedList<Integer>) list).addLast(9);
        System.out.println(list);

//        list.clear();
//        System.out.println(list);
        System.out.println(list.get(3));

        Object clone = ((LinkedList<Integer>) list).clone();
        System.out.println(clone.toString());


        System.out.println(list.contains(2));
//
//        Iterator<Integer> iterator = ((LinkedList<Integer>) list).descendingIterator();  // 逆序遍历
//        while (iterator.hasNext())
//            System.out.print(iterator.next()+" ");
//        

        System.out.println(((LinkedList<Integer>) list).element());

        System.out.println(list.indexOf(2));
        System.out.println(list.lastIndexOf(2));

        ListIterator<Integer> iterator = list.listIterator();
        while (iterator.hasNext())
            System.out.print(iterator.next()+" ");
        
        System.out.println();

        boolean offer = ((LinkedList<Integer>) list).offer(5);
        System.out.println(list);

        ((LinkedList<Integer>) list).offerLast(0);
        System.out.println(list);

        System.out.println(((LinkedList<Integer>) list).peek());
        System.out.println(((LinkedList<Integer>) list).peekFirst());
        System.out.println(((LinkedList<Integer>) list).peekLast());


        List<String> list2  = new LinkedList<>();
//        System.out.println(((LinkedList<Integer>) list2).element());  // 没有则报错
//        System.out.println(((LinkedList<Integer>) list2).peek());
//        System.out.println(((LinkedList<Integer>) list2).peekFirst());
//        System.out.println(((LinkedList<Integer>) list2).peekLast());

        System.out.println(((LinkedList<Integer>) list).poll());
        System.out.println(((LinkedList<Integer>) list).pollFirst());
        System.out.println(((LinkedList<Integer>) list).pollLast());
        System.out.println(((LinkedList<Integer>) list).pop());
        System.out.println(((LinkedList<Integer>) list).pop());
        ((LinkedList<Integer>) list).push(1001);
        System.out.println(list);
//        System.out.println(((LinkedList<String>) list2).removeFirst());

        list.set(0, 99);
        System.out.println(list);
        System.out.println(list.size());

        Spliterator<Integer> spliterator = list.spliterator();
        Spliterator<Integer> split = spliterator.trySplit();
        int characteristics = split.characteristics();
        System.out.println(characteristics);