A colleague of mine recently ran into an issue that I have not run into myself, but found to be interesting and, in my opinion ...
package dustin.examples; /** * Enum representing select western states in the United Sates. */ public enum States { ARIZONA ...
如果HashMap的键(key)是自定义的对象，那么需要按规则定义它的equals()和hashCode()方法。 class Dog ...
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