Java.lang.object has two very important methods defined: public boolean equals(Object obj) and public int hashCode().equals() methodIn java equals() method is used to compare equality of two Objects. The equality can be compared in two ways:...
*/ class People{ private String name; private int age; public People(String name,int age) { this.name = name; this.age = age; } public void setAge(int age){ this.age = age; } @Override public int hashCode() { // TODO Auto-generated method stub return name.hashCode()*37+age; ...
As you can see the Guava version is shorter and avoids superfluous helper objects. In case of equals, it even allows for short-circuiting the evaluation if an earlier Object.equal() call returns false (to be fair: commons / lang has an ObjectUtils.equals(obj1, obj2) method with identica...
The hashCode() method returns the hash code of a string.The hash code for a String object is computed like this:s[0]*31^(n-1) + s[1]*31^(n-2) + ... + s[n-1] where s[i] is the ith character of the string, n is the length of the string, and ^ indicates ...
The value returned by this method is the same value that would be obtained by invoking the List#hashCode() hashCode method on a List containing a sequence of Float instances representing the elements of a in the same order. If a is null, this method returns 0. Added in 1.5. Java documen...
FilePermission.GetHashCode Method Мивикористовуємонеобов’язкові файли cookie, щобудосконалюватинаші веб-сайти, наприкладчереззв’язки із соцмережами, і показ...
除非你的类是final类型并且只是继承至java.lang.Object, 否则lombok会生成一个canEqual方法,这以为着JPA代理仍然可以等于他们的基类,但是添加新状态的子类不会破坏equals契约。下文解释了为什么需要这种方法的复杂原因:How to Write an Equality Method in Java。如果层次结构中的所有类都是scala case类和带有lombok生成的...
Namespace: Java.Security Assembly: Mono.Android.dll Returns a hashcode for this principal. [Android.Runtime.Register("hashCode", "()I", "GetGetHashCodeHandler:Java.Security.IPrincipalInvoker, Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null")] public int GetHashCode(); ...
Byte.HashCode(SByte) MethodReference Feedback DefinitionNamespace: Java.Lang Assembly: Mono.Android.dll Returns a hash code for a byte value; compatible with Byte.hashCode(). [Android.Runtime.Register("hashCode", "(B)I", "", ApiSince=24)] public static int HashCode(sbyte value); ...
上面的三步也是<Effective Java>中推荐的步骤,基本可保证万无一失. 如何重写hashCode()方法 在JavaSE 7 Specification中指出, "Note that it is generally necessary to override the hashCode method whenever this method(equals) is overridden, so as to maintain the general contract for the hashCode method,...