创建一个最简单自定义异常

public class MyException extends Exception
{
public MyException(String msg)
{
super(msg);
}
}
然后将他在方法中抛出即可。
例如：
public void method() throws MyException
{
int a = 0;
int b = 1;
int c = a / b;
if(c == 0 ) throw MyException;
}