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
     
      {	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