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import
java.util.ArrayList;
import
java.util.Collections;
import
java.util.List;
/**
* Java对象排序
*/
public
class
User
implements
Comparable<User> {
private
int
idx;
public
User(
int
idx) {
this
.idx = idx;
}
public
int
getIdx() {
return
idx;
}
public
void
setIdx(
int
idx) {
this
.idx = idx;
}
@Override
public
String toString() {
return
"User{"
+
"idx="
+ idx +
'}'
;
}
@Override
public
int
compareTo(User o) {
return
idx - o.idx;
}
public
static
void
main(String[] args) {
User a1 =
new
User(
1
);
User a2 =
new
User(
2
);
User a3 =
new
User(
3
);
User a4 =
new
User(
4
);
List<User> userList =
new
ArrayList<>(
4
);
userList.add(a3);
userList.add(a2);
userList.add(a4);
userList.add(a1);
Collections.sort(userList);
//排序后彻底改变原集合元素次序
for
(User user : userList) {
System.out.println(user);
}
}
}
|
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User{idx=
1
}
User{idx=
2
}
User{idx=
3
}
User{idx=
4
}
Process finished with exit code
0
|
本文转自 leizhimin 51CTO博客,原文链接:http://blog.51cto.com/lavasoft/1873167,如需转载请自行联系原作者