java – 奇怪的复制构造函数

public AbstractMailingDirections(AbstractMailingDirections toCopy) {
    this.message = toCopy.message;
    this.defaultDirection = new DirectionLoad(toCopy.defaultDirection);
    for (final DirectionLoad dls : toCopy.directionLoads) {
        this.directionLoads.add(new DirectionLoad(dls));
    }
}

和

public DirectionLoad(DirectionLoad toCopy) {
    this.direction = toCopy.direction;
    this.transportationContract = toCopy.transportationContract;
    this.pickUpTime = toCopy.pickUpTime;
    this.acceptanceTime = toCopy.acceptanceTime;
    this.acceptanceLocation = toCopy.acceptanceLocation;
    this.information = toCopy.information;
}

现在,当我调用MailingDirections复制构造函数(它只是超级(toCopy))时,我有时不会复制defaultDirection的字段.或者不是全部.使用Eclipse调试器甚至更奇怪：

在这里,我点击了要复制的AbstractMailingDirections.请参阅toString打印中defaultDirection.acceptanceTime如何为17:00,但在字段列表中显示为null.如果我单击defaultDirection,它的toString print会将acceptanceTime字段显示为null.

这让我疯了.可能导致这种情况的任何想法？