java集合架构____集合层次分析
转自:风一样的码农 http://www.cnblogs.com/chenpi/p/5488296.html
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ArrayList Elements
Java集合框架的接口和类层次关系结构图
Collection和Collections的区别
首先要说的是,"Collection" 和 "Collections"是两个不同的概念;
如下图所示,"Collection"是集合类(Collection)的顶级接口,然而”Collections“是一个提供了一系列静态方法的集合工具类;
Collection的类层次结构图
Map的类层次结构图
总结
代码示例
package simplejava; import java.util.ArrayList; import java.util.HashMap; import java.util.HashSet; import java.util.LinkedList; import java.util.List; import java.util.Map; import java.util.Set; public class Q7 { public static void main(String[] args) { List<String> a1 = new ArrayList<String>(); a1.add("Program"); a1.add("Creek"); a1.add("Java"); a1.add("Java"); System.out.println("ArrayList Elements"); System.out.print("\t" + a1 + "\n"); List<String> l1 = new LinkedList<String>(); l1.add("Program"); l1.add("Creek"); l1.add("Java"); l1.add("Java"); System.out.println("LinkedList Elements"); System.out.print("\t" + l1 + "\n"); Set<String> s1 = new HashSet<String>(); // or new TreeSet() will order the elements; s1.add("Program"); s1.add("Creek"); s1.add("Java"); s1.add("Java"); s1.add("tutorial"); System.out.println("Set Elements"); System.out.print("\t" + s1 + "\n"); Map<String, String> m1 = new HashMap<String, String>(); // or new TreeMap() will order based on keys m1.put("Windows", "2000"); m1.put("Windows", "XP"); m1.put("Language", "Java"); m1.put("Website", "programcreek.com"); System.out.println("Map Elements"); System.out.print("\t" + m1); } }
结果打印:
ArrayList Elements
[Program, Creek, Java, Java]
LinkedList Elements
[Program, Creek, Java, Java]
Set Elements
[tutorial, Creek, Program, Java]
Map Elements
{Windows=XP, Website=programcreek.com, Language=Java}
译文链接:http://www.programcreek.com/2009/02/the-interface-and-class-hierarchy-for-collections/