java custom error exception

java custom error exception

The following code defines an exception to solve the problem of division. If the divisor appears 0 Or a negative number will report an error

Note that the custom exception code must be written in front of the application when it is run for the first time, otherwise an error will occur

无法加载主类
java.lang.NoClassDefFoundError

Copy the following program and run it on java

/*
 *自定义的异常类，格式如下，通过super关键字，将错误信息传递给Exception的构造函数中，之后再调用
 *toString()方法就可以打出自己想写的异常信息了
 */
class MyException extends Exception
{
    MyException(String ErrorMessage)
    {
        super(ErrorMessage);
    }
}
/*
 * 自定义异常：java自己的异常可以手动抛出也可以自动抛出，而自己定义的异常java虚拟机不认识
 * 所以，我们要通过throw关键字自己抛出异常，抛出异常之后我们有两种处理方式，第一种是抛出
 * 第二种是在下面直接try catch进行处理
 */
public class Myyichang 
{
    public static void main(String[] args) 
    {
            try
            {
                int c=chu(2,-1);
                System.out.println(c);
            }
            catch(MyException e)
            {
                System.out.println(e.toString());
            }
    }
    static int chu(int a,int b)throws MyException 
    {
        if(b<=0) 
        {
            throw new MyException("出现负数或者零了");
        }
        return a/b;
    }
}

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