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Java 中的 equals 和 hashCode 方法：关系与正确重写实践

equals 和 hashCode 方法是 Java 中 Object 类的两个关键方法，用于对象比较和哈希表操作： equals：判断两个对象是否逻辑相等，基于对象内容而非引用。 hashCode：返回对象的哈希码，用于哈希表（如 HashMap、HashSet）的快速定位。 在实际开发中，HashMap 和 HashSet 依赖 ...
TheServerSide

How do I find the Java String length?

Community driven content discussing all aspects of software development from DevOps to design patterns. Follow these steps to find the length of a String in Java: Declare a variable of type String ...
InfoWorld

String comparisons in Java

Java’s String class encapsulates an array of bytes. A byte can be converted to a char, in which case, String becomes an array of characters used to compose words, sentences, or any other data you want ...
TheServerSide

String to long in Java

Community driven content discussing all aspects of software development from DevOps to design patterns. The correct way to convert a String to long in Java is to use the parseLong(String x) method of ...
GitHub

Cannot invoke "String.equals(Object)" because the return value of "java.util.Map.get(Object ...

Successfully merging a pull request may close this issue.
GitHub

VideoPlayerController - Attempt to invoke virtual method 'boolean java.lang.String.equals ...

PlatformException: PlatformException(error, Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference, null) File "message_codecs.dart", line 551, ...
InfoWorld

Guava’s Objects Class: Equals, HashCode, and ToString

If you are fortunate enough to be using JDK 7, the newly available Objects class is the obvious (at least to me) choice for implementing the “common” Java object ...