通过前面这个例子,大概可以知道,先通过hashcode来比较,如果hashcode相等,那么就用equals方法来比较两个对象是否相等,用个例子说明:上面说的hash表中的8个位置,就好比8个桶,每个桶里能装很多的对象,对象A通过hash函数算法得到将它放到1号桶中,当然肯定有别的对象也会放到1号桶中,如果对象B也通过算法分到了1号桶,那...
Regular classes do not have any predefined method whereas case class has predefined hashcode and equals method. The comparison of objects of class is done using reference comparison whereas the objects of case class compare the structure of objects. Let's see these points of difference in more de...
clone equals finalize getClass hashCode notify notifyAll toString wait wait wait Constructor Details WhatIfChange public WhatIfChange() Creates an instance of WhatIfChange class.Method Details after public Object after() Get the after property: The predicted snapshot of the resource after the ...
The most natural idea that comes to mind is implementing equals() and hashCode() by comparing the property you mapped as a database identifier (ie. the primary key attribute). This will cause problems, however, for newly created objects, because Hibernate sets the identifier value for you aft...
types that provide a suitable implementation of the hashCode() and equals(Object) methods. You can define a primary key in one of the following ways (in either case, for an entity bean with bean-managed persistence, you create the primary key in the ejbCreate method): Define the type of...
Another common example of Java memory leak is using objects with customequals()andhashCode()methods that are not properly implemented (or not existing at all), with collections that use hashing to check for duplicates. One example of such a collection isHashSet. To illustrate that problem, let...
The format of the What-If results.Fields展開表格 FULL_RESOURCE_PAYLOADS Enum value FullResourcePayloads. RESOURCE_ID_ONLY Enum value ResourceIdOnly.Methods inherited from java.lang.EnumvalueOf clone compareTo describeConstable equals finalize getDeclaringClass hashCode name ordinal toString Methods ...
clone equals finalize getClass hashCode notify notifyAll toString wait wait wait Constructor Details WhatIfChange public WhatIfChange() Creates an instance of WhatIfChange class.Method Details after public Object after() Get the after property: The predicted snapshot of the resource after the ...
clone equals finalize getClass hashCode notify notifyAll toString wait wait wait Constructor Details WhatIfChange public WhatIfChange() Creates an instance of WhatIfChange class.Method Details after public Object after() Get the after property: The predicted snapshot of the resource after the ...
A string representation of this object. See Also: Object.toString() equals public boolean equals(Object obj) Overrides: equals in class Object hashCode public int hashCode() Overrides: hashCode in class Object clone public DescribeWhatIfForecastExportResult clone() Overrid...