equals

问题 According to documentation assertEquals() Asserts that two objects are equal. assertSame() Asserts that two objects refer to the same object. So I am expecting that if I have a class like below class SomeClass {} then SomeClass someClass1= new SomeClass(); SomeClass someClass2= new SomeClass(); assertSame(someClass1,someClass2); // fail assertEquals(someClass1,someClass2); // fail the assertEquals should pass and assertSame should fail, as the value of both classes are equal but they have

问题 According to documentation assertEquals() Asserts that two objects are equal. assertSame() Asserts that two objects refer to the same object. So I am expecting that if I have a class like below class SomeClass {} then SomeClass someClass1= new SomeClass(); SomeClass someClass2= new SomeClass(); assertSame(someClass1,someClass2); // fail assertEquals(someClass1,someClass2); // fail the assertEquals should pass and assertSame should fail, as the value of both classes are equal but they have

问题 This question already has answers here : Closed 10 years ago . Possible Duplicate: Javascript === vs == : Does it matter which “equal” operator I use? What are the differences between === vs == and !== vs != ? When should you use each one? 回答1: === is the Identity operator, and is used to test that value and type are equal. so.. "3" == 3 // true "3" === 3 // false 1 == true // true 1 === true // false "1" == true // true "1" === true // false so when you care that value and type are equal, or

问题 I witnessed this in the GOTO 2016 • Kotlin - Ready for Production conference by Hadi Hariri. In some of his code, what would normally look like: if (x != y) { /* do some stuff */ } Is being displayed in an elegant style: if (x ≠ y) { /* do some stuff */ } Here's a screen-shot from the live coding session: He's using the regular != operator, the IDEA is taking care of the rest. I've been playing with my IntelliJ's configuration but couldn't enable this new fancy feature. Any help? PS. I'm

问题 I need to implement the equals method in some class A. Class A has an orderer collection of Enum type, and the behaviour I want to achive is that equals returns true for two instances of Class A that have exactly the same Enum values in the collection (in exactly the same positions of the collection). As I'm new to java, I'm having problems with this, and I dont know how to properly implement equals or the hashcode methods, so any help would be good :) 回答1: If you're using eclipse (netbeans

问题 I have a custom class like Person: public class Person { int age; String name; } Now I want to sort Person class objects based on age . So I will use Comparable interface and implement compareTo() method. And compareTo will have logic to compare person object based on just age . So if I do : Collections.sort(list); // where list is a list of person I will get sorted person list based on age . But I read somewhere, we need to override equals() method as well when we do Comparable

问题 I am using Entity Framework in my application. I implemented with the partial class of an entity the IEquatable<T> interface: Partial Class Address : Implements IEquatable(Of Address) 'Other part generated Public Overloads Function Equals(ByVal other As Address) As Boolean _ Implements System.IEquatable(Of Address).Equals If ReferenceEquals(Me, other) Then Return True Return AddressId = other.AddressId End Function Public Overrides Function Equals(ByVal obj As Object) As Boolean If obj Is

问题 I have been reading about how best to override the equals method when dealing with subclasses and here I have found quite a few posts. They recommend different ways of implementing a solution using instanceof or getClass() to compare objects of different sub classes. However with reference to Effective Java, my understanding is (and I am new to this so I may well be wrong!) Bloch argues that in the end both can be problematic, “There is no way to extend an instantiable class and add a value

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . Are there any utils in java which allow to check objects equality without equals overriding? For some reasons I don't want to provide my class with equals method. I need something like SomeUtils.equals(a,b) in my unit test which compares all object fields (via reflection I guess). 回答1: You could use

问题 I am using hibernate and id... is used for persistence (which is why it is omitted in comparison). (Also, using google guava helper equals) HolidayPackageVariant: public abstract class HolidayPackageVariant { private Integer idHolidayPackageVariant; private HolidayPackage holidayPackage; private String typeHolidayPackage; @Override public boolean equals(Object obj) { if (obj == this) return true; if(obj == null) return false; if (getClass().equals(obj.getClass())) { final