我有一個(gè)奇怪的問(wèn)題，我無(wú)法理解為什么會(huì)發(fā)生這種情況。我equals在一個(gè)DoublyLinkedList泛型類中實(shí)現(xiàn)了這個(gè)方法：@Override    public boolean equals(Object obj) {        if (this == obj) {            return true;        }        if (getClass() != obj.getClass() || obj == null) {            return false;        }        DoublyLinkedList<E> other = (DoublyLinkedList<E>) obj;        if (this.size != other.size) {            return false;        }        Iterator<E> iterator = this.iterator();        Iterator<E> otherIterator = other.iterator();        while(iterator.hasNext()){                   if(iterator.next() != otherIterator.next()){                return false;            }        }        return true;    }在單元測(cè)試中測(cè)試此方法，如下所示：@Testpublic void testEquals() {    System.out.println("equals");    DoublyLinkedList <String> instance1 = new DoublyLinkedList <>(), instance2 = new DoublyLinkedList <>();    instance1.addLast("Xpto");    instance1.addLast("Ypto");    instance1.addLast("Zpto");    instance2.addLast("Xpto");    assertFalse("Lists should not be equal", (instance1.equals(instance2)));    assertFalse("Lists should not be equal", (instance2.equals(instance1)));            instance2.addLast("Ypto");    assertFalse("Lists should not be equal", (instance1.equals(instance2)));    assertFalse("Lists should not be equal", (instance2.equals(instance1)));    instance2.addLast("Zpto");    assertTrue("Lists should be equal", (instance1.equals(instance2)));    assertTrue("Lists should be equal", (instance2.equals(instance1)));       }告訴我測(cè)試通過(guò)了。但是，如果我在第一個(gè)代碼中使用!=, 而不是equals比較每個(gè)迭代器的實(shí)例，為什么會(huì)發(fā)生這種情況？它不應(yīng)該比較引用，從而失敗嗎？