weekdays.java

（1） 设计和编写代表矩阵的Matrix类。该类包括矩阵行列数变量int rows和int cols

class InvalidIndexException extends Exception{
      private int i;
      InvalidIndexException(int a){
      i=a;
      }
      public String toString(){
        return i+"is out of bundary--0<i<8";
        }
 }
public class Weekdays {
   public static void main(String args[]){
   try{for(int i=1;i<9;i++)
   System.out.println(i+"--"+givename(i));
   }catch(  Exception e){ System.out.println(e.toString());
   }finally{  System.out.println("these days make up a week.");}
   }
      
public static String givename(int d)throws InvalidIndexException {String name;
 switch(d){

	case 1:name="Monday";break;
	case 2:name="Tuesday";break;
	case 3:name="Wednesday";break;
	case 4:name="Thursday";break;
	case 5:name="Friday";break;
	case 6:name="Saturday";break;
	case 7:name="Sunday";break;
	default: throw new InvalidIndexException(d);
	
	  
}return name;
}
}