equals hashCode

原创于 2010-10-08 16:11:43 发布 · 66 阅读

CC 4.0 BY-SA版权

本文介绍了一个Java类中equals方法与hashCode方法的具体实现方式。通过对比两个对象的Userid与Unitid属性来判断对象是否相等，并且通过特定的算法计算对象的哈希值。

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public boolean equals(Object other) {
if ((this == other))
return true;
if ((other == null))
return false;
if (!(other instanceof UnitUserId))
return false;
UnitUserId castOther = (UnitUserId) other;

return ((this.getUserid() == castOther.getUserid()) || (this
.getUserid() != null
&& castOther.getUserid() != null && this.getUserid().equals(
castOther.getUserid())))
&& ((this.getUnitid() == castOther.getUnitid()) || (this
.getUnitid() != null
&& castOther.getUnitid() != null && this.getUnitid()
.equals(castOther.getUnitid())));
}

public int hashCode() {
int result = 17;

result = 37 * result
+ (getUserid() == null ? 0 : this.getUserid().hashCode());
result = 37 * result
+ (getUnitid() == null ? 0 : this.getUnitid().hashCode());
return result;
}