import java.util.Vector;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;

public class TestCollections{
    public static void main(String[] args) {
        ArrayList alist = new ArrayList();
        alist.add(75);
        alist.add(38);
        alist.add(21);
        alist.add(4);
        alist.add(12);

        System.out.println("原列表: " + alist);
        Collections.sort(alist);
        System.out.println("排序后: " + alist);
        Collections.reverse(alist);
        System.out.println("逆序后: " + alist);
        Collections.shuffle(alist);
        System.out.println("混排后: " + alist);
        Collections.rotate(alist,2);//向右移动两个位置
        System.out.println("移位后: " + alist);        
        
        ArrayList blist = new ArrayList();
        blist.add(55);
        blist.add(66);
        System.out.println("新列表: " + blist);
        Collections.copy(alist,blist);
        System.out.println("拷贝后: " + alist);

        System.out.println("列表中出现元素66的次数: " + Collections.frequency(alist,66));
        System.out.println("列表中元素的最大值: " + Collections.max(alist));
        System.out.println("列表中元素的最小值: " + Collections.min(alist));

        Enumeration en = createDemoEnumeration();//createDemoEnumeration是一个静态方法
        ArrayList clist = Collections.list(en);
        System.out.println("Enumeration->ArrayList: " + alist);
    }
    
    public static Enumeration createDemoEnumeration(){
        Vector v = new Vector();
        v.add("Tom");        
        v.add("Billy");        
        v.add("Jenny");        
        return v.elements();    
    }
}