public int hashCode(){ return this.color.length(); } 原文:Java equals() and hashCode() Contract 翻译:ImportNew.com-唐小娟
3.1. The .hashCode()Contract Java SE also defines a contract for the .hashCode()method. A thorough look at this contract reveals how closely related .hashCode()and .equals()are. All three criteria in the .hashCode()contract mention the .equals()method in some way: ...
/*** Returns a hash code value for the object. This method is* supported for the benefit of hash tables such as those provided by* {@link java.util.HashMap}.* * The general contract of {@code hashCode} is:* * Whenever it is invoked on the same object more than once during* an ...
Consistency withhashCode():两个相等的对象必须有相同的hashCode()值 Object的规范中并没有明确要求equals()和hashCode()必须一致-- 它们的结果在随后的调用中将是相同的,假设“不改变对象相等性比较中使用的任何信息。”这听起来象“计算的结果将不改变,除非实际情况如此。”这一模糊声明通常解释为相等性和散列值计...
原文链接:Java equals() and hashCode() Contract 图1 Java所有对象的超类 java.lang.Object 有两个非常重要的方法定义: public boolean equals(Object obj) public int hashCode() 实践证明这两个方法是非常重要的,特别是用Map存储用户自定义对象时.然而,有些高级开发者也不一定知道如何合适的使用它们。
Java hashCode() Java Object hashCode() is a native method and returns the integer hash code value of the object. The general contract of hashCode() method is: Multiple invocations of hashCode() should return the same integer value, unless the object property is modified that is being used ...
简介:翻译人员: 铁锚翻译时间: 2013年11月15日原文链接: Java equals() and hashCode() Contract图1Java所有对象的超类 java.lang.Object 有两个非常重要的方法定义:public boolean equals(Object obj)public int hashCode()实践证明这两个方法是非常重要的,特别是用Map存储用户自定义对象时.然而,有些高级开发者也...
本文是关于hashCode的,它等于Set中用于contains(Object o)方法的协定。 关于使用Set中的contains()方法的一个难题 import java.util.HashSet; class Dog{ String color; public Dog(String s){ color = s; } } public class SetAndHashCode { public static void main(String[] args) { HashSet<Dog> dogSe...
简介:Java中Set的contains()方法 —— hashCode与equals方法的约定及重写原则翻译人员: 铁锚翻译时间: 2013年11月5日原文链接: Java hashCode() and equals() Contract for the contains(Object o) Met... Java中Set的contains()方法 —— hashCode与equals方法的约定及重写原则 ...
Since hashCode and equals are two of java.lang.Object’s methods which follow a contract that binds them together, it makes sense to talk about both methods together. In fact, they are bound in such a way that we cannot implement one without the other and expect to have a well-written ...