swing gui设计.ppt

Collection API ArrayList Vector Reflection API Collections API 收集是代表一个对象组的单个对象，被认为是它的元素。 Collections :没有具体顺序的一组对象 Set :没有复制的一组对象 List :有序对象组，允许复制 收集中，代表一个对象组的单个对象被认为是它的元素；对象的类型都有一个特殊的种类，即它们都是从一个共同父类型延续来的。 Java支持Vector,Bits, Stack, Hashtable, LinkedList等。 Stack实现后进先出（LIFO）的顺序 Hashtable提供一个相关的对象数组。 API还包括诸如HashSet, ArraySet, ArrayList, LinkedList和Vector等等的类，它们实现这些接口。 API还提供了支持某些算法的方法，如：排序，二进制有哪些信誉好的足球投注网站，评估列表中的最小和最大，以及收集等。 通过Iterators, 获取Collections结构中的element 无序的Set List结构的Iterators可以使用next 和previous方法遍历 Reflection API For each class, the Java Runtime Environment (JRE) maintains an immutable Class object that contains information about the class With the reflection API, you can invoke methods on a Class object which return Constructor , Method , and Field objects. You can use these objects to get information about the corresponding constructors, methods, and fields defined in the class. Class Class Instances of the class Class represent classes and interfaces in a running Java application. Class has no public constructor. Retrieving Class Objects If an instance of the class is available Class c = mystery.getClass(); retrieve the Class object for the superclass TextField t = new TextField(); Class c = t.getClass(); Class s = c.getSuperclass(); know the name of the class at compile time Class c = java.awt.Button.class; the class name is unknown at compile time, but available at runtime Class c = Class.forName(strg); * * Collections API Iterators Map结构由Key和Value对构成 Map Sorting arrays using Array.sort method: Sorting list using Collection.sort method: Void sort (List ) ; Void Sort ( List , Comparator ) ; The comparable and comparator interfaces Comparable: compareTo(element : Object): int Comparator: compare(e1: Object, e2:Object) : int Comparator: equals (Object, Object ) : blooean Sorting a set using a SortedSet implementation Sorting Array and Collections Vector implements the List interface Stack is a subclass of Vector push/pop/peek method Hasht