java – 如果assertEquals是相同的日期,为什么这是假的？过冬

我创建了如下日期

Date rightnow = Calendar.getInstance().getTime();

Task t1 = new Task("My task",rightnow);
taskDao.saveOrUpdate(t1);

Task taskR1 = taskDao.get(t1.getIdTask());
assertEquals("They should have to be equal dates",taskR1.getDate(),t1.getDate());

我收到了这个错误

< 2014-04-11 23：13：13.0>不同于< Fri Apr 11 23:13:13 CEST 2014>

java.lang.AssertionError:  
They should have to be equal dates  
expected:<2014-04-11 23:13:13.0>  
but was:<Fri Apr 11 23:13:13 CEST 2014>

与问题相关的额外信息

课程任务

@Entity
@Table(name = "t_task")
public class Task {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "idTask")
    private long idTask;
    ...
    @Column(name = "date")
    private Date date;
    ...

Mysql表t_task

CREATE TABLE IF NOT EXISTS `mytask`.`t_task` (
  `idTask` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,`date` DATETIME NOT NULL
  ...

我在Task中创建了一个新的hashCode()和equals()函数,只有日期字段,所以它是不同的.

@Override
public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((date == null) ? 0 : date.hashCode());
    return result;
}

@Override
public boolean equals(Object obj) {
    if (this == obj)
        return true;
    if (obj == null)
        return false;
    if (!(obj instanceof Task))
        return false;
    Task other = (Task) obj;
    if (date == null) {
        if (other.date != null)
            return false;
    } else if (!date.equals(other.date))
        return false;
    return true;
}

任何的想法？