apache 中的EqualsBuilder跟HashCodeBuilder
日期：2014-05-16 浏览次数：20704 次
apache 中的EqualsBuilder和HashCodeBuilder
?import??org.apache.commons.lang.builder.HashCodeBuilder;
?import??org.apache.commons.lang.builder.EqualsBuilder;
?public???class??PoliticalCandidate??{
?????//??Member?variables?-?omitted?for?brevity
?????//??Constructors?-?omitted?for?brevity
?????//??get/set?methods?-?omitted?for?brevity
?????//??A?hashCode?which?creates?a?hash?from?the?two?unique?identifiers?
?
??????public???int??hashCode(?)??{
?????????return???new??HashCodeBuilder(?17?,??37?)
???????????????????????.append(firstName)
???????????????????????.append(lastName).toHashCode(?);
????}?
?
自动化hashCode()和equals()
? 问题产生：当需要自动实现hashCode()和equals()方法
? 解决方法：使用EqualsBuilder和HashCodeBuilder?
? 使用举例：
?
?import??org.apache.commons.lang.builder.HashCodeBuilder;?import??org.apache.commons.lang.builder.EqualsBuilder;?public???class??PoliticalCandidate??{?????//??Member?variables?-?omitted?for?brevity?????//??Constructors?-?omitted?for?brevity?????//??get/set?methods?-?omitted?for?brevity?????//??A?hashCode?which?creates?a?hash?from?the?two?unique?identifiers????????public???int??hashCode(?)??{?????????return???new??HashCodeBuilder(?17?,??37?)???????????????????????.append(firstName)???????????????????????.append(lastName).toHashCode(?);????}??
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