มือใหม่สอบถามเรื่อง Java ครับ ไม่ทราบว่า concept แบบนี้จะเขียนยังไงดีครับ

import java.util.Scanner;
public class array {
    
    
    
        
public static int[] inputData(){
    
    Scanner keyboard = new Scanner(System.in);
    int arrayIn[] = new int[5];
    
    for (int i=0; i<=4; i++) {
    System.out.print("No "+ (i+1)+" is ");    
    arrayIn[i] = keyboard.nextInt();
    
    }
    
    return arrayIn;
}
public static void findMax(){
    int max=0;
    for(int i=0;i<5;i++){
    if (arrayIn[i]>max)
    max=arrayIn[i];
    }
   
}
public static void findMin(){
     int min=9999;
          for(int i=0;i<5;i++){
            if (arrayIn[i]<min)
              min=arrayIn[i];
          }
    
}

public static void sumNum(){
    int total=0;
           for (int i=0;i<5;i++){
          total=total+arrayIn[i];
           }
          return total;
        }
       

public static void average(){
    float avg=0;
    avg=total/i
     
}
public static void showStat(){
    System.out.println("Max is" +max+ " Min is " +min+ " Sum is "+total+ " Average is "+avg);

}
public static void main(String args[]){
        int[]arrayIn = inputData();
        //int max = findMax();
        
        
        System.out.println(arrayIn[0] +"-"+ arrayIn[1]+"-"+arrayIn[2]+"-"+arrayIn[3]+"-"+arrayIn[4]);
        findMin();
        findMax();
        sumNum();
        average();
        showStat();
    }
}