java输入n个学生成绩 用java输入学生成绩

public class Card {
 /**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int stu[] = new int[3];
		try{
		for(int i=0; i<stu.length;i++) { 
		Student s = new Student();
		s.getStudent();
		s.showStudent();
		s.averStudent();
		}
		}catch (Exception e){
		System.out.println("输入有误：");
		}
		}
		}		class Student {
		int id;
		String name;
		double a,b,c;
		double avg;
		Object e=null;		public void getStudent(){
		Scanner keyboard=new Scanner(System.in);
		System.out.println("请输入学号：");
		id=keyboard.nextInt();
		System.out.println("请输入姓名：");
		name=keyboard.next();
		System.out.println("请输入语文课成绩：");
		a=keyboard.nextInt();
		System.out.println("请输入数学课成绩：");
		b=keyboard.nextInt();
		System.out.println("请输入英语课成绩：");
		c=keyboard.nextInt();
		}
		public void showStudent() {
		System.out.println("学号："+id+" "+"姓名："+ name+" "+"语文课成绩："+a+" "+"数学课成绩："+b+" "+"英语课成绩："+c);
		}
		public void averStudent() {
		avg=(a+b+c)/3;
		System.out.println("三门课的平均成绩是："+avg);
		}	}