factorialexception.java

项目实战

class FactorialException{
	int num;
	void FactorialException(int num){
		this.num=num;
	}
	void summ(){
		try{
			int sum=0;
			for(int i=1;i<num;i++){
				sum=sum*i;
			}
			System.out.println(num+"的阶乘是:"+sum);
		}catch(NumberFormatException a){
			System.out.println("请输入数字!!!");
		}catch(IllegalArgumentException b){
			System.out.println("数据不合法!!!");
		}
	}
}
class aa{
	public static void main(String[] args){
		FactorialException f=new FactorialException();
		f.summ(5);
		
	}
}