Java Comparable接口的使用

public class Student implements Comparable{
    private String useName;
    private int age;

    public String getUseName() {
        return useName;
    }

    public void setUseName(String useName) {
        this.useName = useName;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

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

    @Override
    public int compareTo(Student o) {
        return this.getAge()-o.getAge();
    }
}

测试

 public static void main(String[] args) {
        //创建两个Student对象并调用getMax方法
        Student s1 = new Student();
        s1.setUseName("张三");
        s1.setAge(18);

        Student s2 = new Student();
        s2.setUseName("李四");
        s2.setAge(20);

        Comparable max = getMax(s1, s2);
        System.out.println(max);
    }

getMax方法

public static Comparable getMax(Comparable c1, Comparable c2) {
        int result = c1.compareTo(c2);
        //如果result<0,则c10,则c1>c2
        //如果result=0,则c1=c2
        if (result >= 0) {
            return c1;
        } else {
            return c2;
        }
    }