比较器的使用

private static class Student{
    int age;
    String name;
    int height;

    public Student(int age, String name, int height) {
        this.age = age;
        this.name = name;
        this.height = height;
    }

    @Override
    public String toString() {
        return "Student{" +
                "age=" + age +
                ", name='" + name + '\'' +
                ", height=" + height +
                '}';
    }
}

private static class isIncrease implements Comparator<Student>{
    @Override
    public int compare(Student o1, Student o2) {
        return o1.height - o2.height;
    }
}

Student[] students = new Student[]{
        new Student(12,"lvachao",23),
        new Student(14,"lvacha",678),
        new Student(34,"lvaco",87),
};

Arrays.sort(students,new isIncrease());
for (Student student : students){
    System.out.println(student);
}

上面程序输出：
Student{age=12, name='lvachao', height=23}
Student{age=34, name='lvaco', height=87}
Student{age=14, name='lvacha', height=678}