我有一个HashMap:Maphm=newHashMap();LotWaferBeanlw=newLotWaferBean();...//populatelwif(!hm.containsKey((LotWaferBean)lw)){hm.put(lw,triggerFiles[l]);}LotWaferBean的代码:@Overridepublicbooleanequals(Objecto){if(!(oinstanceofLotWaferBean)){returnfalse;}if(((LotWaferBean)o).getLotId().equals(lotId)&&((LotW
我有一个HashMap:Maphm=newHashMap();LotWaferBeanlw=newLotWaferBean();...//populatelwif(!hm.containsKey((LotWaferBean)lw)){hm.put(lw,triggerFiles[l]);}LotWaferBean的代码:@Overridepublicbooleanequals(Objecto){if(!(oinstanceofLotWaferBean)){returnfalse;}if(((LotWaferBean)o).getLotId().equals(lotId)&&((LotW
假设我有类User:publicclassUser{privateLongid;privateStringname;privateIntegerage;privateBigDecimalaccount;//otherfields,gettersandsetters}如下重写equals方法合适吗？@Overridepublicbooleanequals(Objectob){if(ob==null){returnfalse;}if(this==ob){returntrue;}if(obinstanceofUser){Userother=(User)ob;returnthis.id.equ
假设我有类User:publicclassUser{privateLongid;privateStringname;privateIntegerage;privateBigDecimalaccount;//otherfields,gettersandsetters}如下重写equals方法合适吗？@Overridepublicbooleanequals(Objectob){if(ob==null){returnfalse;}if(this==ob){returntrue;}if(obinstanceofUser){Userother=(User)ob;returnthis.id.equ
来自theJavadocforBigDecimal:Note:careshouldbeexercisedifBigDecimalobjectsareusedaskeysinaSortedMaporelementsinaSortedSetsinceBigDecimal'snaturalorderingisinconsistentwithequals.例如，如果您创建一个HashSet并将newBigDecimal("1.0")和newBigDecimal("1.00")添加到它，该集合将包含两个元素(因为值具有不同的比例，因此根据equals和hashCode不相等)，但如果你做同样的事
来自theJavadocforBigDecimal:Note:careshouldbeexercisedifBigDecimalobjectsareusedaskeysinaSortedMaporelementsinaSortedSetsinceBigDecimal'snaturalorderingisinconsistentwithequals.例如，如果您创建一个HashSet并将newBigDecimal("1.0")和newBigDecimal("1.00")添加到它，该集合将包含两个元素(因为值具有不同的比例，因此根据equals和hashCode不相等)，但如果你做同样的事
这个问题在这里已经有了答案:WhichoverloadwillgetselectedfornullinJava?(3个回答)Howdoesnullworkinthiscode?[duplicate](2个回答)关闭7年前。publicclassTestMain{publicstaticvoidmethodTest(Exceptione){System.out.println("Exceptionmethodcalled");}publicstaticvoidmethodTest(Objecte){System.out.println("Objectmethodcalled");}pub
这个问题在这里已经有了答案:WhichoverloadwillgetselectedfornullinJava?(3个回答)Howdoesnullworkinthiscode?[duplicate](2个回答)关闭7年前。publicclassTestMain{publicstaticvoidmethodTest(Exceptione){System.out.println("Exceptionmethodcalled");}publicstaticvoidmethodTest(Objecte){System.out.println("Objectmethodcalled");}pub
假设有两个这样的类:abstractclassA{/*someirrelevantmethods*/}classBextendsA{publicfinalintx;publicB(finalintx){this.x=x;}/*somemoreirrelevantmethods*/}然后我使用Eclipse的“Source→GeneratehashCode()andequals”在类B上生成equals()和hashCode()方法()……”。但Eclipse警告我:Thesuperclass'com.example.test2.A'doesnotredeclareequals()and
假设有两个这样的类:abstractclassA{/*someirrelevantmethods*/}classBextendsA{publicfinalintx;publicB(finalintx){this.x=x;}/*somemoreirrelevantmethods*/}然后我使用Eclipse的“Source→GeneratehashCode()andequals”在类B上生成equals()和hashCode()方法()……”。但Eclipse警告我:Thesuperclass'com.example.test2.A'doesnotredeclareequals()and
