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本帖最后由 __BlueGuy__ 于 2012-10-19 23:54 编辑
以前都没注意过这里
还真不知道结构体的哈希值怎么计算，怎么计算能保证结构体的哈希值唯一
有重码怎么办？？...
public int hashCode()
{
return 7 * name.hashCode() + 11 * new Double(salary).hashCode() + 13 * hireDay.hashCode();
}
public boolean equals(Object otherObject)
{
// a quick test to see if the objects are identical
if (this == otherObject) return true;
// must return false if the explicit parameter is null
if (otherObject == null) return false;
// if the classes don't match, they can't be equal
if (getClass() != otherObject.getClass()) return false;
// now we know otherObject is a non-null Employee
Employee other = (Employee) otherObject;
// test whether the fields have identical values
return name.equals(other.name) && salary == other.salary && hireDay.equals(other.hireDay);
}
public String toString()
{
return getClass().getName() + "[name=" + name + ",salary=" + salary + ",hireDay=" + hireDay
+ "]";
}
private String name;
private double salary;
private Date hireDay; |
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发表于 2012-10-19 23:50
