public class ArrayTool{
  
  public static int sum(int[] data){
    int sum = 0;
    for (int i = 0; i < data.length; i++){
      sum = sum + data[i];  // sum += data[i];
    }
    return sum;
  }
  
  public static boolean allPositive(int[] data){
    for (int i = 0; i < data.length; i++){ 
      if (data[i] <= 0) {
        return false;
      }
    } 
    return true; 
  }
  
  public static void main(String [] args){
    int[] data = new int[] {6, 10, 12, 0, 0};
    int s = ArrayTool.sum(data);
    System.out.println(s);
    System.out.println(ArrayTool.allPositive(data));
  }


}