class Demo78
{
public static void main(String[] args) {
try{
div(4,0,null);
}catch(Exception e){
e.printStackTrace();
System.out.println("哎呀，出错了...");
}
}
public static void div(int a , int b,int[] arr) throws Exception,NullPointerException {
if(b==0){
throw new ArithmeticException();//抛出一个异常对象。
}else if(arr==null){
throw new NullPointerException();
}
int c = a/b;
System.out.println("结果："+ c);
}
}
