package *;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
public class JavaTest {
public static void main(String[] args) {
class UserInfo {
private String name;
private String age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
@Override
public String toString() {
return "UserInfo [name=" + name + ", age=" + age + "]";
}
}
class UserInfoCompartor implements Comparator<UserInfo> {
public int compare(UserInfo o1, UserInfo o2) {
long deNum = Long.parseLong(o2.getAge()) - Long.parseLong(o1.getAge());
return deNum > 0? 1 : deNum < 0? -1 : 0;
}
}
List<UserInfo> userInfos = new ArrayList<UserInfo>();
for (int i = 0; i < 5; i++) {
UserInfo userInfo = new UserInfo();
userInfo.setAge("2"+i);
userInfo.setName("Google:" +i);
userInfos.add(userInfo);
}
System.out.println("Before: " + userInfos);
Collections.sort(userInfos, new UserInfoCompartor());
System.out.println("After: " + userInfos);
}
}
Before: [UserInfo [name=Google:0, age=20], UserInfo [name=Google:1, age=21], UserInfo [name=Google:2, age=22], UserInfo [name=Google:3, age=23], UserInfo [name=Google:4, age=24]]
After: [UserInfo [name=Google:4, age=24], UserInfo [name=Google:3, age=23], UserInfo [name=Google:2, age=22], UserInfo [name=Google:1, age=21], UserInfo [name=Google:0, age=20]]