question3.java

java课程的资料以及实验的代码

class NotExistedStudentInfoException extends Exception
//customized exception throwable for non-existed student info
{
	public String toString()
	{
		return("Student info not existing...");
	}
};

class Process//calculate total score and average score, append as suffix
{
	String processInfo(String info)
	{
	String[] unit=info.split(" ");
	int length=unit.length;
	int [] score=new int[length-2];
	int i,sum=0;
	float avg;
	for (i=2;i<length;i++) 
	{
		score[i-2]=Integer.parseInt(unit[i]);
		sum+=score[i-2];
	};
	avg=sum/(length-2.0f);
	String h=" "+sum+" "+avg;
	return(info.concat(h));
	}
}

class Q3
{
	public static void main(String args[]) //args[0] is student number
	{
		String [] student={ "[M] 20060423 65 43 49 85","[S] 20030214 85 64 98 75 61 84",
				"[G] 20040624 85 64 92 71 64 85 73 92"};
		try
		{
			String id=args[0];//obtain the student number
			int indexFound=-1;
			int ll=student.length;
			int i,location=-1;
			char specialChar;
			for (i=0;i<ll;i++) if (student[i].indexOf(id)>=0)
			{
				location=student[i].indexOf(id);
				indexFound=i;
				break;
			};
			if (indexFound!=-1) specialChar=student[indexFound].charAt(location+id.length());
			else specialChar='A';
			if (specialChar!=' ') throw new NotExistedStudentInfoException();
			student[indexFound]=new Process().processInfo(student[indexFound]);
			String [] cc=student[indexFound].split(" ");
			int lll=cc.length;
			for (i=0;i<lll-4;i++) 
			{	int yy=i+1;
				System.out.print("c"+yy+"  ");
			}
			System.out.print("Total"+"  Average\n");
			for (i=0;i<lll-3;i++) System.out.print(cc[i+2]+"  ");
			System.out.println("  "+cc[i+2]);
		}
		catch (ArrayIndexOutOfBoundsException ee)
		{
			System.out.println("input parameter error\n");
		}
		catch (NotExistedStudentInfoException e)
		{
			System.out.println(e.toString());
		}
	}
}