import java.util.Collection;
import java.util.Iterator;
public class CollectionDemo {
public CollectionDemo() {// TODO Auto-generated constructor stub
}
public static void main(String[] args) {
Collection coll = new ArrayList();
//增添元素coll.add("abc1");
coll.add("abc2");
System.out.println( coll );
//刪除元素
coll.remove("abc2");
//清空集合
coll.clear();
//是否包含該元素
coll.contains("abc1");
Collection c1 = new ArrayList ();
Collection c2 = new ArrayList();
c1.add(" ad ");
c2.add(" abc ");
c2.addAll(c1);//將c1中的元素添加到c2中
System.out.println(c2);
c2.remove(c1); // 將兩個集合相同的元素從調用removeAll的集合中刪除
c1.contains(c2); //c1是否包含c2
System.out.println(c1.contains(c2));
// 使用collection中的iterator ()方法,調用集合中的迭代器方法,
// Iterator it = c1.iterator();
// while ( it.hasNext()){
//
// System.out.println(it.next());
// }
for ( Iterator it = coll.iterator();it.hasNext();){ //for循環節省內存
it.next();
}
}
}