Java8 Stream流的使用 sorted

代码示例

// 查询全部部门
        List<SysDept> deptAllList = deptMapper.selectList(Wrappers.emptyWrapper());
        // 查询数据权限内部门
        List<Integer> deptOwnIdList = deptMapper.selectListByScope(Wrappers.emptyWrapper(), new DataScope()).stream()
                .map(SysDept::getDeptId).collect(Collectors.toList());
        // 权限内部门
        List<TreeNode<Integer>> collect = deptAllList.stream()
                .filter(dept -> dept.getDeptId().intValue() != dept.getParentId())
                .sorted(Comparator.comparingInt(SysDept::getSort)).map(dept -> {
                    TreeNode<Integer> treeNode = new TreeNode();
                    treeNode.setId(dept.getDeptId());
                    treeNode.setParentId(dept.getParentId());
                    treeNode.setName(dept.getName());
                    // 有权限不返回标识
                    treeNode.setExtra(MapUtil.of("isLock", !deptOwnIdList.contains(dept.getDeptId())));
                    return treeNode;
                }).collect(Collectors.toList());

自然序排序一个list

list.stream().sorted()

使用Comparator 来排序一个list

sorted(Comparator.comparingInt(SysDept::getSort))