我有一个 java People 对象:
public class People {
String lastname;
String firstname;
String gender;
String datebirth;
String fcolor;
public People(String lastname, String firstname, String gender,String datebirth, String fcolor) {
this.lastname = lastname;
this.firstname = firstname;
this.gender = gender;
this.datebirth = datebirth;
this.fcolor = fcolor;
}
public String getLastname() {
return lastname;
}
public String getFirstname() {
return firstname;
}
public String getGender() {
return gender;
}
public String getFcolor() {
return fcolor;
}
public String getDatebirth() {
return datebirth;
}
}
我想创建一个比较器来按出生日期进行比较(出生日期有时采用这种格式“2/13/1943”,有时采用这种格式“2-13-1943”,您能帮助我了解如何实现它吗?
我开始这样做,但感到困惑:
import java.util.Date;
import java.text.SimpleDateFormat;
import java.util.Comparator;
import java.text.DateFormat;
public class CompareDateBirth implements Comparator<People>{
public int compare(People p, People q) {
DateFormat df = new SimpleDateFormat("dd-MM-yyyy");
Date Pdate = null;
Date Qdate= null;
try {
Pdate = df.parse(p.getDatebirth());
Qdate = df.parse(q.getDatebirth());
} catch (Exception e) {
e.printStackTrace();
}
return Pdate.compareTo(Qdate) > 0 ? 1 : 0;
}
}
如果您使用正确的类型存储出生日期 - ajava.util.Date
对象而不是String
- 你不会有这个问题。格式是显示问题。
一个名为“People”的类?
我可以这样做(下面的所有类都位于名为 model 的包中单独的 .java 文件中):
package model;
public enum Gender { MALE, FEMALE }
public class Person {
private String firstName;
private String lastName;
private Gender gender;
private Date birthDate; // I'd make sure to set hh:mm:ss all to midnight
// constructors, getters, equals, hashCode, and toString are left for you
}
public class BirthDateComparator implements Comparator<Person> {
public int compare(Person p, Person q) {
if (p.getBirthDate().before(q.getBirthDate()) {
return -1;
} else if (p.getBirthDate().after(q.getBirthDate()) {
return 1;
} else {
return 0;
}
}
}
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