计算矩形和圆形的面积和周长(java)

package exe02;
import java.util.Scanner; 
/*name:Excise1                   功能：计算矩形和圆形的面积和周长
 */
public class second1 {
	public static void main(String[] args) {
	   Scanner sc = new Scanner(System.in);
	   Rectangle re = new Rectangle();
	   System.out.print("请输入矩形的长和宽:");
	   
	   double x = sc.nextDouble();
	   double y = sc.nextDouble();
       while(x