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import
java.util.ArrayList;
import
java.util.Collections;
import
java.util.Comparator;
import
java.util.HashMap;
import
java.util.List;
import
java.util.Map;
/**
* ClassName: Sort
* @Description: list集合按元素的某一属性排序
* @author ljw
* @date 2018年5月24日
*/
public
class
Sort {
public
static
void
main(String[] args) {
List> list =
new
ArrayList<>();
for
(
int
i =
0
; i <
10
; i++) {
Map map =
new
HashMap<>();
Integer random = (
int
)(Math.random() *
100
);
map.put(
"random"
, random);
list.add(map);
}
System.out.println(
"排序前："
+ list);
Collections.sort(list,
new
Comparator>() {
public
int
compare(Map m1, Map m2) {
return
m1.get(
"random"
).compareTo(m2.get(
"random"
));
}
});
System.out.println(
"排序后："
+ list);
}
} |
排序前：[{random=79}, {random=44}, {random=38}, {random=65}, {random=43}, {random=83}, {random=90}, {random=87}, {random=83}, {random=13}]
排序后：[{random=13}, {random=38}, {random=43}, {random=44}, {random=65}, {random=79}, {random=83}, {random=83}, {random=87}, {random=90}]