Comparator与Comparable，自定义排序和类比较器，TreeSet对象排序
2024-09-18 03:13:19
/**
* 学生类
* @author Administrator
*
*/
public class Student { private String sno ;
private String sname ;
private Integer score ; public Student(String sno, String sname, Integer score) {
super();
this.sno = sno;
this.sname = sname;
this.score = score;
}
public String getSno() {
return sno;
}
public void setSno(String sno) {
this.sno = sno;
}
public String getSname() {
return sname;
}
public void setSname(String sname) {
this.sname = sname;
}
public Integer getScore() {
return score;
}
public void setScore(Integer score) {
this.score = score;
} import java.util.Comparator;
/**
* 比较算法的类，比较器
* @author Administrator
*
*/
public class MyCmp implements Comparator<Student>{ @Override
public int compare(Student o1, Student o2) {
// TODO Auto-generated method stub
if (o1.getScore() > o2.getScore()) {
return 1;
} else if (o1.getScore() < o2.getScore()) { return -1;
} else {
return 0;
}
}
package tr
import java.util.TreeSet;
//测试类
public class Test { public static void main(String[] args) {
TreeSet<Student> set = new TreeSet<Student>(new MyCmp());
Student s1 = new Student("1001","chen",67);
Student s2 = new Student("1001","zhang",17);
Student s4 = new Student("1003","zeng",47);
Student s5 = new Student("1004","wang",87);
Student s6 = new Student("1005","chao",67);
Student s3 = new Student("1002","zhou",62);
set.add(s1);
set.add(s2);
set.add(s3);
set.add(s4);
set.add(s5);
set.add(s6);for(java.util.Iterator<Student> it= set.iterator();it.hasNext();){
Student s = it.next();
System.out.println(s.getSno()+","+s.getSname()+","+s.getScore());
}
} }
/**
* 学生类
* @author Administrator
*
*/
public class Student1 implements Comparable<Student1>{ private String sno ;
private String sname ;
private Integer score ; public Student1(String sno, String sname, Integer score) {
super();
this.sno = sno;
this.sname = sname;
this.score = score;
}
public String getSno() {
return sno;
}
public void setSno(String sno) {
this.sno = sno;
}
public String getSname() {
return sname;
}
public void setSname(String sname) {
this.sname = sname;
}
public Integer getScore() {
return score;
}
public void setScore(Integer score) {
this.score = score;
} // 自定义排序规则
@Override
public int compareTo(Student1 s) {
if (this.getScore() > s.getScore()) {
return 1;
} else if (this.getScore() < s.getScore()) {
return -1;
} else {
return 0;
}
} }
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