Arrays只适合一个数组/对象内的数值进行比较,
Comparable比较器(Compara)适合数组,对象,队列等排序,
Comparable是一个接口类,实现此接口必须复写:compareTo 方法,
compareTo方法会返回三个值:1,0,-1,可以利用这三个值进行排序
//比较器
class Student2 implements Comparable<Student2>{
private int strno;
private String name;
private int age;
private float score;
public Student2(int strno, String name, int age, float score) {
this.strno = strno;
this.name = name;
this.age = age;
this.score = score;
}
@Override
public String toString() {
// TODO 自动生成的方法存根
return "学号:"+this.strno+",姓名:"+this.name+",年龄:"+this.age+",成绩:"+this.score;
}
@Override
public int compareTo(Student2 stu) {
// TODO 自动生成的方法存根
if(this.score > stu.score)
{
return 1;
}else if(this.score < stu.score){
return -1;
}else{
return 0;
}
}
}
public class CompareDemo {
public static void main(String args[])
{
Student2 stu[] = {new Student2(1,"张三",20,98.13f),
new Student2(2,"李四",33,88.18f),
new Student2(3,"王五",41,80.32f),
new Student2(4,"赵六",28,89.77f),
new Student2(5,"田七",25,90.53f)};
//排序
System.out.println("++++++++++++数组排序前+++++++++++++++");
print(stu);
System.out.println("++++++++++++数组排序后+++++++++++++++");
Arrays.sort(stu);
print(stu);
}
public static void print(Student2 stu[])
{
for(int i=0;i<stu.length; i++)
{
System.out.println(stu[i]);
}
}
}