- it
- 自定义比较器Comparator和Comparable示例
自定义比较器Comparator
package com
.set
;
import java
.util
.Comparator
;
import com
.bean
.Person
;
public class PersonComparatorByAgeAndName implements Comparator<Person> {
@Override
public int compare(Person o1
, Person o2
) {
int val
= o1
.getAge() - o2
.getAge();
if (val
== 0) {
return o1
.getName().compareTo(o2
.getName());
} else {
return val
;
}
}
}
Comparable比较器
package com
.exer
;
public class Student implements Comparable<Student> {
private Integer no
;
private String name
;
private int score
;
@Override
public int compareTo(Student o
) {
int v
= this.score
- o
.score
;
return v
== 0 ? this.no
- o
.no
: v
;
}
public Student() {
}
public Student(Integer no
, String name
, int score
) {
this.no
= no
;
this.name
= name
;
this.score
= score
;
}
public Integer
getNo() {
return no
;
}
public void setNo(Integer no
) {
this.no
= no
;
}
public String
getName() {
return name
;
}
public void setName(String name
) {
this.name
= name
;
}
public int getScore() {
return score
;
}
public void setScore(int score
) {
this.score
= score
;
}
@Override
public String
toString() {
return score
+ ", " + no
+ ", " + name
;
}
}
