我们创建用户定义exception.In类包含一个参数化的构造函数，该构造函数将其参数传递给超类，即Exception类。在这个类之外，我声明了另一个类SimpleThrow.here我输入两个变量x，y的双类型。Z是x，y的除法。如果我把y作为零，它应该把控件抛给catch（ArithmeticException e）块。但是它不抛出除了用户定义的Exception之外的任何catch块，MyclassEx.How我可以让Myclass异常的所有catch块都处于活动状态？

import java.lang.Exception;
import java.util.*;
class MyclassEx extends Exception{
    MyclassEx(String msg)
    {
        super(msg);
        System.out.println(msg);
    }
}
public class SimpleThrow
{
    public static void main(String[] args)
    {
        
        try
        {
            double x=0,y=0,z=0;
            Scanner sc=new Scanner(System.in);
            System.out.print("Enter two numbers:");
            x=sc.nextDouble();
            y=sc.nextDouble();
            z=x/y;
                
                if(z<0.01)
                {
                    **throw new MyclassEx("Number is too small");**
                }  
        }
        catch(MyclassEx e)
        {
            System.out.println("caught exception");
                
        }
        catch(ArithmeticException obj)
        {
            System.out.println("division not possible BY 0");
        }
        catch(InputMismatchException e2)
        {
            System.out.println("you have entered wrong key:");
        }
        finally
        {
            System.out.println("yoo");
        }
    }
}

D:\debolina\java\Error_handling>javac SimpleThrow.java

D:\debolina\java\Error_handling>java SimpleThrow       
Enter two numbers:45
0
yoo