Java sorting method How to use sort

Original: http://www.cnblogs.com/minshia/p/6283858.html

Sort an array:

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//对数组排序publicvoidarraySort(){    int[] arr = {1,4,6,333,8,2};    Arrays.sort(arr);//使用java.util.Arrays对象的sort方法    for(inti=0;i<arr.length;i++){        System.out.println(arr[i]);    }}

To sort the collection:

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//对list升序排序    publicvoidlistSort1(){        List<Integer> list = newArrayList<Integer>();        list.add(1);        list.add(55);        list.add(9);        list.add(0);        list.add(2);        Collections.sort(list);//使用Collections的sort方法        for(int a :list){            System.out.println(a);        }    }    //对list降序排序    publicvoidlistSort2(){        List<Integer> list = newArrayList<Integer>();        list.add(1);        list.add(55);        list.add(9);        list.add(0);        list.add(2);        Collections.sort(list, newComparator<Integer>() {            public intcompare(Integer o1, Integer o2) {                returno2 - o1;            }        });//使用Collections的sort方法，并且重写compare方法        for(inta :list){            System.out.println(a);        }    }<br>注意：Collections的sort方法默认是升序排列，如果需要降序排列时就需要重写conpare方法

Java sorting method How to use sort