What you are talking about is the default implementation of the Object class

public String toString() { return getClass().getName() + "@" + Integer.toHexString(hashCode()); }

Actually, the output of LinkedList’s toString() is like this

[111, 222, 333]

Why is this? Please look at the picture below:

From the picture, you can see that there is anAbstractCollection
in its ancestor class, and in this class, there is an override oftoString():

public String toString() { Iterator it = iterator(); if (! it.hasNext()) return "[]"; StringBuilder sb = new StringBuilder(); sb.append('['); for (;;) { E e = it.next(); sb.append(e == this ? "(this Collection)" : e); if (! it.hasNext()) return sb.append(']').toString(); sb.append(',').append(' '); } }

Seeing this, you should understand, right?

LinkedList l = new LinkedList(); l.add("hello world"); System.out.println(l.toString()); // 输出[hello world]

Why is mine different from yours...your code? JRE version?

java is designed like this, maybe you thinkLinkedList的toString应该把所有Object打印出来，但java设计者就认为只打印LinkedListthe short message itself is fine.

You can write a function yourself to implement this function. It’s very simple, just loop it.

LinkedList list; // some code for (MyObject obj: list) { System.out.println(obj); }