Question

java map 怎么按按key排序

Answer 1

java中map按照double大小进行排序，可以使用collentions接口的sort方法进行比较，实例如下：

Collections.sort(dataMap, new Comparator<Map<String, Object>>() { @Override public int compare(Map<String, Object> lhs, Map<String, Object> rhs) { Double d5 = ((Double) rhs.get(OpenPrice)); Double d6 = (Double) lhs.get(OpenPrice); if (d5 != null && d6 != null) { return d5.compareTo(d6); } else { return flag; } // return d1.compareTo(d2);}

根据返回的int类型，可设置按照从大到小还是从小到大排序

Answer 2

建议你用treeMap