public class DoublyList { public DoubleNode head; public DoublyList() { this.head = new DoubleNode(); this.head.prev = null; this.head.next = null; } public boolean isEmpty() { re...-Go服务器开发

如果要将insert方法修改为public DoubleNode<T> insert(T x)，并且不改变程序运行结果的话，可以按照以下方式修改代码：

import java.util.*;

public class DoublyList<T> {
    public DoubleNode<T> head;

    public DoublyList() {
        this.head = new DoubleNode<>();
        this.head.prev = null;
        this.head.next = null;
    }

    public boolean isEmpty() {
        return this.head.next == null;
    }

    public String toString() {

        String str = this.getClass().getName() + "(";
        DoubleNode<T> p = this.head.next;
        while (p != null) {
            str += p.data.toString() + ((p.next != null) ? "," : "");
            p = p.next;
        }
        return str + ")";

    }

    public DoubleNode<T> insert(T x) {
        if (x == null)
            return null;

        DoubleNode<T> q = new DoubleNode<>(x, head.prev, head);
        
        if (head.prev != null) {
            head.prev.next = q; 
		} else { 
			head.next = q; 
		}
		
		head.prev = q; 

        return q;
    }

   
   // 其他方法保持不变
   
   
	public static void main(String[] args) {
	    DoublyList<Integer> list1 = new DoublyList<>();
	    DoublyList<Integer> list2 = new DoublyList<>();
	    
	    for (int i = 1; i <= 5; i++)
	        list1.insert(i);
	    
	    for (int i = 6; i <= 10; i++)
	        list2.insert(i);
	    
	    System.out.println(list1.toString());
	    System.out.println(list2.toString());
	    
	    list1.addAll(list2);
	    
	    System.out.println(list1.toString());
	}
}

这样修改后，程序仍然能够正常运行，且结果不变。

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