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Day 0 : statistics

import java.io.; import java.util.; import java.text.; import java.math.; import java.util.regex.*;

public class Solution {

public static void main(String[] args) {
    
    Scanner sc = new Scanner(System.in);
    
    int nbInput = sc.nextInt();
    List<Integer> liste = new ArrayList<Integer>();
    
    for(int i=0; i<nbInput; i++){
        int val = sc.nextInt();
        Integer val2 = Integer.valueOf(val);
        liste.add(val);
    }
    
    Collections.sort(liste);
    
    //System.out.println(liste);
    
    double mean = getMean(liste, nbInput);
    double median = getMedian(liste, nbInput);
    int mode = getMode(liste, nbInput);
    
    System.out.println(mean);
    System.out.println(median);
    System.out.println(mode);
    /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
}

public static double getMean(List<Integer> liste, int nbInput){
    
    double total = 0;
    for(final Integer i : liste){
        total += i;
    }
    
    total = total/nbInput;
    
    return total;
    
}

public static double getMedian(List<Integer> liste, int nbInput){
    
    double median = 0;
    
    if(liste != null){
        int tailleListe = liste.size();
    
        if(tailleListe % 2 == 0){
            median += liste.get(tailleListe/2);
            median += liste.get(tailleListe/2 - 1);
            median = median/2;
        }else{
            median = liste.get((tailleListe+1)/2);
        }
    }
    return median;
}

public static int getMode(List<Integer> liste, int nbInput){
    
    int mode = 0;
    int lastIndex = 0;
    int lastOcc = 1;
    
    if(liste!=null){
        mode = liste.get(0);
        
        for(int i=0; i<liste.size(); i++){

            int occurrences = Collections.frequency(liste, liste.get(i));

            if(occurrences > lastOcc){
                mode = liste.get(i);
                lastOcc = i;
            }
            
        }
    }
    return mode;
}

}