Java中Collection和Collections的区别

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
 
public class TestCollections {
     
    public static void main(String args[]) {
        //注意List是实现Collection接口的
        List list = new ArrayList();
        double array[] = { 112, 111, 23, 456, 231 };
        for (int i = 0; i < array.length; i++) {
            list.add(new Double(array[i]));
        }
        Collections.sort(list);
        for (int i = 0; i < array.length; i++) {
            System.out.println(list.get(i));
        }
        // 结果：23.0 111.0 112.0 231.0 456.0
    }
}