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Webandroid培训、java培训、期待与您交流! 一面向对象的基础概念 1 对象 对象是世界中的一个实体,他有如下特征: 1)有一个名字区别于其他对象。 2)有一个状态用来描述他的特征。 3)有一组操作,决定对象的一种功能。 2 类 类(Class)是面向对象系统中的重要概念,是一组具有相同数据结构和共同操作对象的集合。 3 继承 继承是使用已经存在的定义作为 … Web8 apr 2024 · Advanced Set Operations in Java. The HashSet class includes several methods for performing various set operations, such as:. Union of Sets, via the addAll() method.; Intersection of sets, via the retainAll() method.; Difference between two sets, via the removeAll() method.; Check if a set is a subset of another set, via the containsAll() … WebThis site requires JavaScript to be enabled. city pot jurong point