public class Student implements Comparable<Student>
{
private String name;
private int age;
public Student() {
super();
// TODO Auto-generated constructor stub
}
public Student(String name, int age) {
super();
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
//重写hashCode()和equals(),集合添加元素时调用,元素键重复,值覆盖.
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + age;
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Student other = (Student) obj;
if (age != other.age)
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
return true;
}
//打印输出格式.
@Override
public String toString() {
return "Student [name=" + name + ", age=" + age + "]";
}
//重写方法,元素添加时调用,排序.
@Override
public int compareTo(Student o) {
// TODO Auto-generated method stub
int num = this.age - o.age;
return num==0?this.name.compareTo(o.name):num;
}
//排序时优先调用
class MyComparator implements Comparator<Student>{//Comparator<Student>
@Override
public int compare(Student o1, Student o2) {
int num = o1.age - o2.age;
return num==0?o1.name.compareTo(o2.name):num;
}