排序Java集合

使用比较器：

List<CustomObject> list = new ArrayList<CustomObject>();Comparator<CustomObject> comparator = new Comparator<CustomObject>() {    @Override    public int compare(CustomObject left, CustomObject right) {        return left.getId() - right.getId(); // use your logic    }};Collections.sort(list, comparator); // use the comparator as much as u wantSystem.out.println(list);

此外，如果

CustomObject

Comparable

Collections.sort(list)

使用JDK 8，语法要简单得多。

List<CustomObject> list = getCustomObjectList();Collections.sort(list, (left, right) -> left.getId() - right.getId());System.out.println(list);

更简单

List<CustomObject> list = getCustomObjectList();list.sort((left, right) -> left.getId() - right.getId());System.out.println(list);

最简单的

List<CustomObject> list = getCustomObjectList();list.sort(Comparator.comparing(CustomObject::getId));System.out.println(list);

显然，初始代码也可以用于JDK 8。