TreeMap升序排序

定义工具类

public class TreeMapUtil implements Comparator{


@Override
public int compare(Object o1, Object o2) {
String i1=(String)o1;
String i2=(String)o2;
        return -i1.compareTo(i2);
}


}

继承comparator

调方法使用

TreeMapUtil treeMapUtil = new TreeMapUtil();
Map<String,String[]> allData = new java.util.TreeMap<String,String[]>(treeMapUtil);

for(Map map : findRecordList){
String[] dataString = new String[3];
dataString[0] =  map.get("visits").toString();
allData.put(map.get("create_time").toString(),dataString);

}

我这里返回的是list《map》集合