匿名內部類的聲明使用方式，
Comparabletor接口實現，需要先導入包，再實現Comparator的對象比較的方法，並且需要新聲明比較器類去實現此接口，再用比較器類新建對象調用compare(Objecto1, Object o2)方法，比較兩個需要比較的對象的大小
Comparable的接口實現方式，可以直接使用需要比較的類去實現此接口，需要比較的對象去調用compareTo(Object o)方法即可
import java.util.Comparator;
import java.util.Arrays;
public class TestComparator{
public static void main(String[] args){
Student s1 = new Student(16, 'n', 99);
Student s2 = new Student(18, 'n', 98);
int res = s1.compareTo(s2);//根據實現接口重寫的方法，對分數進行比較
Student s3 = new Student(17, 'n', 96);
Student[] students = new Student[3];
students[0] = s1;
students[1] = s2;
students[2] = s3;
Arrays.sort(students, new Comparator(){ //新建匿名內部類，對學生年齡進行比較
public int compare(Object o1, Object o2){
Student s1 = (Student)o1;
Student s2 = (Student)o2;
return s1.getAge() - s2.getAge();
}
});
for (int i = 0; i <= students.length-1 ; i++) {
System.out.println(students[i]);
}
}
}
class Student implements Comparable{
public int age;
public char gender;
public int score;
public Student(){
}
public Student(int age, char gender, int score){
this.age = age;
this.gender = gender;
this.score = score;
}
public void setAge(int age){
this.age = age;
}
public int getAge(){
return this.age;
}
public void setChar(char gender){
this.gender = gender;
}
public char getChar(){
return this.gender;
}
public void setScore(int score){
this.score = score;
}
public int getScore(){
return this.score;
}
public String toString(){
return "age: " + this.age + ", gender: " + this.gender + ", score: " + this.score;
}
public int compareTo(Object o){
Student s = (Student)o;
return this.score - s.score;
}
}