【java】打印一個對象即打印出該對象toString()返回值

public class TestToString {
    public static void main(String[] args){
        Node node1=new Node("東邪");
        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);//打印一個對象即調用該對象的toString()並打印出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;//對象和String類型作+操作是返回對象的toString
    }
}

運行結果：

東邪,西毒,南帝,北丐,中神通