【java】打印一个对象即打印出该对象toString()返回值

 public class TestToString {
     public static void main(String[] args){
         Node node1=new Node("东邪");
         node1.next=new Node("西毒");
         node1.next.next=new Node("南帝");
         node1.next.next.next=new Node("北丐");
         node1.next.next.next.next=new Node("中神通");
         System.out.println(node1);//打印一个对象即调用该对象的toString()并打印出toString()返回值
     }
 }
 class Node{
     Object value;
     Node next;
     public Node(Object value){
         this.value=value;
     }
     public String toString(){
         return next==null?value.toString():value+","+next;//对象和String类型作+操作是返回对象的toString
     }
 }

运行结果：

东邪,西毒,南帝,北丐,中神通