关于利用sort排序对象数组私有数据成员例子

package six;
import java.util.Scanner;
import java.util.Arrays;

public class Test16 {
	public static void main(String[] arge){
		int x;
		Scanner scanner=new Scanner(System.in);
		Circle[] circle=new Circle[5];
		for(x=0;x<5;x++){
			System.out.println("please input number");
			circle[x]=new Circle(scanner.nextInt());
		}
		scanner.close();
		Arrays.sort(circle);
		for(x=0;x<5;x++){
			System.out.print(circle[x].getradius());
		}
	}
}
 class Circle implements Comparable{
	private int radius;
	Circle(int x){
		this.radius=x;
	}
	public int getradius(){
		return radius;
	}
	public int compareTo(Object obj){
		return this.radius-((Circle)obj).radius;
	}
 }