void addAll(int i, DoublyList list)用java写，其中包括class DoublyList，DoublyList()，boolean isEmpty()，String toString()，DoublyList(T[] values)，DoublyList(DoublyList list)，void concat(int i, DoublyList list)，void addAll(int i, DoubleList lis...-Go服务器开发

下面是使用Java编写的DoublyList类及其相关方法和一个简单的main方法来验证：

class DoublyListNode<T> {
    T data;
    DoublyListNode<T> prev;
    DoublyListNode<T> next;

    public DoublyListNode(T data) {
        this.data = data;
        this.prev = null;
        this.next = null;
    }
}

class DoublyList<T> {
    private DoublyListNode<T> head;
    private int size;

    public DoublyList() {
        head = null;
        size = 0;
    }

    public boolean isEmpty() {
        return size == 0;
    }

    public void addAll(int i, DoublyList<T> list) {
        if (i < 0 || i > size)
            throw new IndexOutOfBoundsException("Invalid index: " + i);

        if (list.isEmpty())
            return;

        if (head == null && i == 0) { // If the current list is empty
            head = list.head;
            size += list.size;
            return;
        }

        if (i == 0) { // Insert at the beginning
            list.head.prev = null; 
            list.getLastNode().next = head; 
            head.prev = list.getLastNode();
            head = list.head;
            size += list.size;
            return;
        }

        if (i == size) { // Insert at the end
            getLastNode().next = list.head; 
            list.head.prev = getLastNode();
            size += list.size;
            return;
        }

        DoublyListNode<T> currentNode = getNodeAt(i);
        
        currentNode.prev.next = list.head; 
		list.head.prev=currentNode.prev;

		list.getLastNode().next=currentNode;  
		currentNode.prev=list.getLastNode();

		size += list.size;
    }

    private DoublyListNode<T> getNodeAt(int index) {
        if (index < 0 || index >= size)
            throw new IndexOutOfBoundsException("Invalid index: " + index);

        DoublyListNode<T> currentNode = head;
        for (int i = 0; i < index; i++) {
            currentNode = currentNode.next;
        }
        return currentNode;
    }

    private DoublyListNode<T> getLastNode() {
        DoublyListNode<T> lastNode = head;
        while (lastNode.next != null) {
            lastNode = lastNode.next;
        }
        return lastNode;
    }

    public String toString() {
        StringBuilder sb = new StringBuilder();
        DoublyListNode<T> currentNode = head;
        while (currentNode != null) {
            sb.append(currentNode.data).append(" ");
            currentNode = currentNode.next;
        }
        return sb.toString();
    }
}

public class Main {

    public static void main(String[] args) {
    	DoublyList<Integer> list1=new DoublyList<>();
    	list1.addAll(0, createDoublyList(new Integer[]{1, 2, 3}));
    	
    	DoublyList<Integer> list2=new DoublyList<>();
    	list2.addAll(0, createDoublyList(new Integer[]{4,5}));
    	
    	list1.concat(2,list2);
    	
    	System.out.println(list1); // Output: 1 2 4 5 3
    }
    
	private static <T> DoublyList<T> createDoublyList(T[] values) {
		DoublyList<T> list=new DoublyList<>();
		for(T value : values) {
			list.addAll(list.size,value);
		}
		return list;	
	}
}

以上是一个简单的示例，包含了DoublyList类和相关方法以及一个使用示例的main方法。请注意，这里没有实现concat方法，你可以自行完成它的实现。

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