引数を配列にして値を受け取る

//Sample07_111.java
class Sample07_111 {

  /*クラスメソッドの定義*/
static void calc02(int[] array, double[] resultArr,char[] rankArr){
  double sum = 0;
  double max = 0;
  double min = 100;
  double avg = 0;

  for(double dou : array){
      sum += dou;
      max = max < dou ? dou : max;
      min = min < dou ? min : dou;
  }
  avg = sum / array.length;

  resultArr[0] = sum;
  resultArr[1] = max;
  resultArr[2] = min;
  resultArr[3] = avg;

  if(sum>320){
      rankArr[0] = 'A';
  }else if(sum>240){
      rankArr[0] = 'B';
  }else{
      rankArr[0] = 'C';
  }

}

public static void main(String[] args){

  int[] values = {
      80,74,91,70,44,68,92,76,88,57
  };

  double[] result = new double[4];//メモリアドレスを保存
  char[] rank = new char[1];//メモリアドレスを保存

  /*クラスメソッドの呼び出し*/
  calc02(values, result, rank);
  System.out.println("合計: " + result[0]);
  System.out.println("最大: " + result[1]);
  System.out.println("最小: " + result[2]);
  System.out.println("平均: " + result[3]);

  System.out.println("評価: " + rank[0]);
}
}

>javac Sample07_111.java
>java Sample07_111
合計: 740.0
最大: 92.0
最小: 44.0
平均: 74.0
評価: A