剑指Offer-03-从头到尾打印单链表-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_27512741/article/details/106836844

本文介绍了一种使用递归和非递归方法实现单链表逆序打印的算法。通过递归调用和栈结构，可以有效地改变链表元素的输出顺序，而无需修改链表本身的结构。

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import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Stack;

/**
 * 从头到尾打印单链表
 * @Description
 */
public class Test04 {
    public static class ListNode{
        int value;
        ListNode next;
        public ListNode(int value){
            this.value = value;
        }
    }

    //递归法
    public int[] reversePrint2(ListNode head) {
        if (head == null){
            return new int[0];
        }
        List<Integer> list = new ArrayList<>();
        reversePrintRecursive(head,list);
        int size = list.size();
        int[] result = new int[size];
        for (int i = 0; i < size; i++) {
            result[i] = list.get(i);
        }
        return result;
    }

    private void reversePrintRecursive(ListNode node, List<Integer> list) {
        if (node == null){
            return;
        }
        if (node.next != null){
            reversePrintRecursive(node.next,list);
        }
        //递归返回的时候将值加入list当中
        list.add(node.value);
    }

    //利用栈（非递归）
    public int[] reversePrint(ListNode head) {
        Stack<ListNode> stack = new Stack<ListNode>();
        ListNode temp = head;
        while (temp != null){
            stack.push(temp);
            temp = temp.next;
        }
        int size = stack.size();
        int[] result = new int[size];
        for (int i = 0; i < size; i++) {
            result[i] = stack.pop().value;
        }
        return result;
    }
    public static void main(String[] args) {
        ListNode ListNode1 = new ListNode(1);
        ListNode ListNode2 = new ListNode(2);
        ListNode ListNode3 = new ListNode(3);
        ListNode ListNode4 = new ListNode(4);
        ListNode ListNode5 = new ListNode(5);
        ListNode1.next=ListNode2;
        ListNode2.next=ListNode3;
        ListNode3.next=ListNode4;
        ListNode4.next=ListNode5;
        System.out.println(Arrays.toString(new Test04().reversePrint(ListNode1)));
    }
}