public void getAdd (String input){
	    
		StringTokenizer st = new StringTokenizer (input);
		temp= new Student[students.length+st.countTokens()/2];
				for (int j=0; j<= students.length-1; j++){
			
			temp[j] = students[j];	
		}
		
		for (int i=0; st.hasMoreTokens(); i++)
			try{
			String name = st.nextToken();
			int grade = Integer.parseInt(st.nextToken());
			temp[i] = new Student (name,grade);
			students = temp;
		} catch (Exception e){
					System.out.println("Input Error");
					System.exit(0);
			}
		
	}