目录

1.超市特价商品采购

 2.统计学校人数

1.超市特价商品采购

import java.util.Scanner;//导入import java.util.Scanner包
public class CS {
	static void avg(int a) throws MyException{
	
		System.out.println("请输入鲜鸡蛋的重量(斤):");
		Scanner scanner=new Scanner(System.in);//从键盘获取输入的值放入scanner
		int a1=scanner.nextInt();//把scanner的值赋予给a
		if(a1>=10) {
			throw  new MyException("");
		}else {System.out.println("异常提示:"+"这份鲜鸡蛋的重量为10.0斤");
		}}
	public static void main(String[] args) {
		try {
			avg(10);
		}catch(MyException e) {
			System.out.println("异常提示:"+"这份鲜鸡蛋的重量为10.0斤");
		}
}
}

 2.统计学校人数

 

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();
            }
        }

    }
}