java中对象数组的排序与比较

首先，数组中的元素即被排序的对象要实现comparable接口及其compareTo(Object o)方法

class Student implements Comparable{

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

    public int compareTo(Object o){
        Student s = (Student)o;
        return age>s.age ? 1 : (age==s.age ? 0 : -1);
    }
}

第二步，通过Arrays.sort(Object[] a) 对数据进行排序

Student[] students = Student[]{new Student(10,"zhangsan"),new Student(20,"lisi"),new Student(30,"wangwu")};
Arrays.sort(students);