java：Comparator-自定义比较

public void testSort3() {
List<Student> studentList = new ArrayList<Student>();
Random random = new Random();
studentList.add(new Student(random.nextInt(1000) + "", "Mike"));//int+string类的空值=string类
studentList.add(new Student(random.nextInt(1000) + "", "Angela"));
studentList.add(new Student(random.nextInt(1000) + "", "Lucy"));
studentList.add(new Student(10000 + "", "Beyonce"));

Collections.sort(studentList, new StudentComparator());//将集合按照StudentComparator这个类所实现的比较方法来排序

System.out.println("----------------按照姓名排序后-----------------");
for (Student student : studentList) {
System.out.println("学生：" + student.id + ":" + student.name);
}
}

import java.util.Comparator;

public class StudentComparator implements Comparator<Student> {

@Override
public int compare(Student o1, Student o2) {//重写compare方法，规定将Student的name属性作为比较条件。
// TODO Auto-generated method stub
return o1.name.compareTo(o2.name);
}

}