第十二次JAVA作业

import java.util.Scanner;
public class SuperMarket {//创建一个SuperMarket类

	public static void main(String[] args) {
		System.out.println("请输入鲜鸡蛋的重量(斤):");//输入所称鲜鸡蛋的重量
		Scanner a = new Scanner(System.in);//控制台输入
		int egg = a.nextInt();//将a值赋值于鲜鸡蛋重量
		if(egg<=7) {//鸡蛋重量所符合的承受条件
			System.out.println("应付" + egg*3.98+"元");//输出应付的钱
		}
		else {
			try {
				int ar=Integer.parseInt("24的");//强制转换数据类型
			}
			catch(Exception e) {//处理异常
				System.out.println("异常提示:这份鲜鸡蛋的重量为" +egg+"斤,超出3斤,超重了!!!");//信息输入
			}
		}
		// TODO Auto-generated method stub

	}}

public class CountIsNotIntegerException extends Exception {

    public CountIsNotIntegerException(String message) {
        super(message);// 实现父类构造法方法
    }

    public static void main(String[] args) {
        Number count = 456214.2; 
        School school = new School();
        school.setCount(count);
    }

}

class School {
    private Number count;

    public void setCount(Number count) {
        Integer i = count.intValue();// 把人数转为整数
        Double d = count.doubleValue();// 把人数转为浮点数
        double di = i;// 整数付给浮点数
        if (d.equals(di)) {// 如果两个浮点数数值相同
            this.count = count;
        } else {// 否则抛异常
            try {
                throw new CountIsNotIntegerException("人数不能为小数：" + d);
            } catch (CountIsNotIntegerException e) {
                e.printStackTrace();
            }
        }

    }
}