java - two problems with mean med mode method -

so here completed code calculates mean, median, mode, standard deviation, min, max, q1, q2, , 5 number summary supposed returned array. array formatted knowledge, odd reason return array spitting out 5 number summary:[d@689af4 , don't life of know why or how fix it. mode outputting 22 when need out put -1. there 1 can @ , tell me wrong , can fix these issues?

import java.util.arrays;  class statistics {   public static void main(string[] args)   {      int[] = new int[]{22,44,66,55,33};             bubblesort(a);            double mean;             double median;             int mode;            int max;            int min;            double sd;            int q1;             int q3;             double[] vals;               mode = calcmoe (a);            median = calcmed (a);            mean = calcmean (a);            max =calcmax (a);            min =calcmin (a);            sd =calcsd (a);            q1=calcquart1 (a);             q3=calcquart3 (a);             vals=calcnumsum (a);               system.out.println("median:"+median);             system.out.println("mean:"+mean);             system.out.println("mode:"+mode);            system.out.println("max number : " + max);            system.out.println("min number : " + min);            system.out.println("standard deviation:"+sd);            system.out.println("1st quartile:"+q1);             system.out.println("3rd quartile:"+q3);            system.out.println("5 number summary:"+vals);    }      public static double calcmean(int[] a)   {    // int[]array = {22,44,66,55,33};      int i;//=0;     int sum=0;     double mean =0;     ( i=0;i<a.length;i++)     {        //system.out.println(a[i]);       sum=sum+a[i];     }     {  mean = ((double) sum/ ((double) a.length));       //system.out.println(); } {          return mean;}       }     //calulate median     public static double calcmed(int[] a)  {// sort array    int[] sorta = bubblesort(a);    double median = 0;   if (a.length % 2 == 0)     {     int indexa = (sorta.length - 1) / 2;    int indexb = sorta.length / 2;     median = ((double) (sorta[indexa] + sorta[indexb])) / 2;   }  // else if our array's length odd   else     {    int index = (sorta.length - 1) / 2;    median = a[ index ];   }    // print values of sorted array   (int v : sorta)    {     system.out.println(v);   }    return median;      }     public static int[] bubblesort(int[] a)     {      //outer loop      for(int luck=0; luck<a.length -1; luck++){      (int juck=1; juck<a.length - luck; juck++){        if (a[juck-1]>a[juck]){          int temp= a[juck];          a[juck]=a[juck-1];          a[juck-1]=temp;           //system.out.printf("unsorted array after %d pass %s: %n", luck+1,     arrays.tostring(a));        }       }      }     return a;     }       public static int calcmoe(int[] a) {     arrays.sort(a);       int count2 = 0;      int count1 = 1;      int pupular1 =0;      int mode =0;       (int = 0; < a.length; i++)     {             pupular1 = a[i];             count1 = 1;              (int j = + 1; j < a.length; j++)         {             if (pupular1 == a[j]) count1++;         }          if (count1 > count2)         {                 mode = pupular1;                 count2 = count1;         }          if (count1 == count2)         {             mode = math.min(mode, pupular1);           }           }        return mode;   }    public static int calcmax(int[] a) {  //int min = a[0];  int max = a[0];   (int = 1; <= a.length - 1; i++) {   if (max < a[i]) {    max = a[i];    }   }    return max;  } public static int calcmin(int[] a) {  int min = a[0];    (int = 1; <= a.length - 1; i++) {   if (min > a[i]) {    min = a[i];   }   }    return min;  } public static double calcsd(int[] a) {   //int sum = 0;   //int max = 0;   //int min = a[0];   double sd = 0;   int = 0;   double mean =0;   sd=0;     ( i=0;i<a.length;i++)         {        sd += ((a[i] - mean)*(a[i] - mean)) / (a.length - 1);     }      double standarddeviation = math.sqrt(sd);  {  }  return standarddeviation;   } public static int calcquart1(int[] a) {   int[] sorta = bubblesort(a);    int q1 = 0;   {    int index = (sorta.length - 1) / 4;    q1 = a[ index ] ;   }     (int v : sorta)    {     system.out.println(v);   }    return q1;   } public static int calcquart3(int[] a) {   int[] sorta = bubblesort(a);    int q3 = 0;   {    int index = 3*(sorta.length - 1) / 4;    q3 = a[ index ] ;   }     (int v : sorta)     {     system.out.println(v);   }    return q3;  }    public static double[] calcnumsum(int[] a) {      double median = calcmed (a);   double max =calcmax (a);   double min =calcmin (a);   double q1=calcquart1 (a);    double q3=calcquart3 (a);    double[] vals = new double[5];   vals[0] = min;    vals [1] = q1;    vals [2] = median;    vals [3] = q3;    vals [4] = max;    return vals; }    } 

this line:

system.out.println("5 number summary:"+vals); 

simply takes vals, converts string, , prints it. default tostring implementation array types in java produces output noted: overall type ([ 'array'), type stored in array (d double), @ symbol, , location of array in memory (689af4, in case).

to perhaps more useful output purposes, can use arrays.tostring:

system.out.println("5 number summary: " + arrays.tostring(vals));