http://www.cnblogs.com/LittleHann/p/3690187.html
import java.util.*; public class TestCollection { public static void main(String[] args) { Collection arrayList = new ArrayList();
arrayList.add("====天晴朗=====");
arrayList.add("====暖花儿朵朵绽放=====");
arrayList.add("====暖花儿朵朵绽放=====");
arrayList.add("====暖花儿朵朵绽放=====");
arrayList.add("====暖花儿朵朵绽放=====");
arrayList.add("====暖花儿朵朵绽放====="); System.out.println(arrayList);
System.out.println(arrayList.size());
Object[] objs = arrayList.toArray();
for(int i = 0 ; i < objs.length ; i++){
System.out.println(objs[i]);
} Collection linkedList = new LinkedList();
linkedList.add("====天晴朗=====");
linkedList.add("====暖花儿朵朵绽放=====");
linkedList.add("====暖花儿朵朵绽放=====");
linkedList.add("====暖花儿朵朵绽放=====");
linkedList.add("====暖花儿朵朵绽放=====");
linkedList.add("====暖花儿朵朵绽放====="); System.out.println(linkedList);
System.out.println(linkedList.size());
Object[] linkedobjs = linkedList.toArray();
for(int i = 0 ; i < linkedobjs.length ; i++){
System.out.println(linkedobjs[i]);
} Collection vector = new Vector();
vector.add("====天晴朗=====");
vector.add("====暖花儿朵朵绽放=====");
vector.add("====暖花儿朵朵绽放=====");
vector.add("====暖花儿朵朵绽放=====");
vector.add("====暖花儿朵朵绽放=====");
vector.add("====暖花儿朵朵绽放====="); System.out.println(vector);
System.out.println(vector.size());
Object[] vectors = vector.toArray();
for(int i = 0 ; i < vectors.length ; i++){
System.out.println(vectors[i]);
} Collection hashSet = new HashSet();
hashSet.add("====天晴朗=====");
hashSet.add("====暖花儿朵朵绽放=====");
hashSet.add("====暖花儿朵朵绽放=====");
hashSet.add("====暖花儿朵朵绽放=====");
hashSet.add("====33333=====");
hashSet.add("=========");
System.out.println(hashSet);
System.out.println(hashSet.size());
hashSet.remove("=========");
System.out.println(hashSet);
System.out.println(hashSet.size()); //SortedSet是抽象的,不能被实例化
//'SortedSet' is abstract; cannot be instantiated
//Collection sortedset = new SortedSet(); //EnumSet是抽象的,不能被实例化
//'EnumSet' is abstract; cannot be instantiated
//Collection enumset =new EnumSet(); } }