大哥，不会吧，这样的问题也要求人。。。。。。


import java.io.*;
class NotValidNumException extends Exception{
}
public class Score{
   public static int getChoose() 
             throws IoException,NumberNotFormatException,NotValidNumException{
      InputStreamReader ir = new InputStreamReader(System.in);
      BufferedReader br = new BufferedReader(ir);
      int i = 0;
      i = Integer.parseInt(br.readLine());
      if(i != 1 || i != 2){
         throw new NotValidNumException();
      }
      return i;
   }
   
   public static int getArraySum(int[] num){
      int sum = 0;
      for(int i = 0 ; i < num.length ; i++ ){
         sum += num[i];
      }
      return sum;
   }
   
   public static int getArrayAvg(int[] num){
      int sum = Score.getArraySum(num);
      int avg = sum/num.length;
      return avg;
   }
   public static void main(String[] args){
      int[] num = {98,79,67,90,88,64,53,97};
      boolean flag = true;
      Integer choose = null;
      while(flag){
          System.out.println("please input your choose:");
          try{
             choose = Score.getChoose();
          }catch(NumberNotFormatException e){
             System.out.println("the inputed number is error!please input again!");
             continue;
          }catch(NotValidNumException ee){
             System.out.println("the inputed number is invalid number!"
                        + "please input again!");
             continue;
          }catch(IOException eee){
             System.out.println(eee.getMessage());
             continue;
          }
          flag = false;
       }
       if(choose == 1){
          System.out.println("These number's Avg :  " + getArrayAvg);
       }
       if(choose == 2){
          System.out.println("These number's Sum :  " + getArraySum);
       }
   }
}

------解决方案--------------------
呵呵，按楼主的要求，应该不用写的这么麻烦吧~~

------解决方案--------------------
       if(choose == 1){
         System.out.println("These number's Avg :  " + getArrayAvg);
      }
      if(choose == 2){
         System.out.println("These number's Sum :  " + getArraySum);
      }
红色部分编绎能过么？？？


------解决方案--------------------
上面楼主写的不错啊，
public static float getAverage(float[] temp) {
		float tempV = 0;
		int m = 0;
		for (int i = 0; i < temp.length; i++) {
			tempV += temp[i];
			m++;
		}

		return tempV / m;
	}

	public static float getSum(float[] temp) {
		float tempV = 0;
		for (int i = 0; i < temp.length; i++) {
			tempV += temp[i];
		}
		return tempV;
	}

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		float[] temp = { 89, 97, 23, 47, 86, 80, 32, 128 };
		while(true){
			System.out.println("start");
		InputStreamReader input = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(input);
		char tempCharater = (char) br.read();
		System.out.println(tempCharater);
		
		if (tempCharater == '1') {
			System.out.println("成绩的平均数：");
			System.out.println(getAverage(temp));
		} else if (tempCharater == '2') {
			System.out.println("成绩的总和：");