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摘要： 本质 字节码 int类型 1 int = 4 byte public static void switchTest(int a) { switch (a) { case 1: System.out.println("1"); break; case 2: System.out.println("2" 阅读全文

摘要： 概述 This class implements the <tt>Map</tt> interface with a hash table, using reference-equality in place of object-equality when comparing keys (and v 阅读全文

摘要： 概述 Doubly-linked list implementation of the {@code List} and {@code Deque} interfaces. Implements all optional list operations, and permits all elemen 阅读全文

摘要： Queue 概述 A collection designed for holding elements prior to processing.Besides basic {@link java.util.Collection Collection} operations, queues provi 阅读全文

摘要： Iterable 概述 Implementing this interface allows an object to be the target of the "for-each loop" statement. 实现Iterable接口 允许一个对象 作为 foreach遍历的目标； publi 阅读全文

摘要： Map 概述 An object that maps keys to values. A map cannot contain duplicate keys; each key can map to at most one value. Map将key映射到value； Map的key不能重复，每个 阅读全文

摘要： 概述 Hash table and linked list implementation of the <tt>Set</tt> interface, with predictable iteration order. This implementation differs from <tt>Has 阅读全文

摘要： SortedSet 概述 A {@link Set} that further provides a <i>total ordering</i> on its elements.The elements are ordered using their {@linkplain Comparable n 阅读全文

摘要： SortedMap 概述 A {@link Map} that further provides a <em>total ordering</em> on its keys.The map is ordered according to the {@linkplain Comparable natu 阅读全文

摘要： 概述 This class implements the <tt>Set</tt> interface, backed by a hash table (actually a <tt>HashMap</tt> instance). It makes no guarantees as to the i 阅读全文