Comparabel实现类之间的比较

概论

在平时编码时免不了要进行各种比较，java内置了Comparable接口，我们可以实现这个接口，然后进行比较,int,double等基础类型不能进行这样比较，必须使用其包装类Integer等。

Demo：

import java.awt.Shape;class Student implements Comparable<Student>{    private String name;    private int score;    public Student(String name, int score) {        super();        this.name = name;        this.score = score;    }    public int getScore() {        return score;    }    @Override    public int compareTo(Student o) {//o为所比较的对象        if(o.getScore()<score)      //比较的条件            return 1;               //符合返回1        else            return 0;               //不符合返回0    }    @Override    public String toString() {        return "Student [name=" + name + ", score=" + score + "]";    }}public class CompareTo {    public static <T> Comparable<T> findMax(Comparable<T>[] arr)    {        int maxIndex = 0;        for (int i = 0; i < arr.length; i++) {            if(arr[i].compareTo((T) arr[maxIndex])>0)//如果返回值大于0，则maxindex = i;                maxIndex = i;        }        return arr[maxIndex];//最后返回最大的    }    public static void main(String[] args) {    Integer[] in = {1,2,3,4,5,7,6};    System.out.println(findMax(in));    String [] st = {"Joe","Bob","Bill","ZZZZZ"};    System.out.println(findMax(st));    //  int [] s = {1,2,3,4,5,7,6};    //System.out.println(findMax(s));     //错误因为其只能用于实现了compare接口的类中    Student[] stu = {new Student("one", 90),                    new Student("two", 100),                    new Student("three", 95)};    System.out.println(findMax(stu));    }}

Result

7ZZZZZStudent [name=two, score=100]