java类库 collection与collections （转）

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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

    }

}