Java Bubble sorting not working -

i want write program sorts 3 integers. integers entered input dialog. code simple. need data , put them in array called num. , create method sort data using bubble-sort logic. method called sort. have added command display sorted result system.out.println("sorted result : "+arrays.tostring(num)) that's not working. output let me input data , nothing happen.

can please tell me miss or did wrong? thank you.

package numthree;  import java.util.scanner; import java.util.arrays;  public class sort {       public static void main(string[] args) {              scanner sc = new scanner(system.in);             int[] num = new int[3];               //input data             system.out.println("enter integers : ");              for(int i=0;i<=num.length;i++){                  num[i]=sc.nextint();              }              sort(num);      }      //sorting     public static void sort (int[] num){          for(int i=0;i<=num.length-1;i++){              for(int j=0;j<=num.length-i;j++){                  if(num[j-1]>num[j]){                     int temp = num[j];                     num[j] = num[j-1];                     num[j-1] = temp;                 }              }               system.out.println("sorted result : "+arrays.tostring(num));          }       }  } 

i believe need boolean flag implement bubble sort cannot know in advance how many times loop perform swapping of consecutive elements.

try this:

package numthree;  import java.util.scanner; import java.util.arrays;  public class sort {       public static void main(string[] args) {          scanner sc = new scanner(system.in);         int[] num = new int[3];           //input data         system.out.println("enter integers : ");          for(int i=0;i<=num.length;i++){              num[i]=sc.nextint();          }          sort(num);      }      //sorting     public static void sort (int[] num){        boolean swapped = true;        while(swapped){             swapped = false;            for(int i=0;i<num.length-1;i++){                  if(num[i]>num[i+1]){                     int temp = num[i];                     num[i] = num[i+1];                     num[i+1] = temp;                     swapped = true;                 }            }        }        system.out.println("sorted result : "+arrays.tostring(num));     } } 

note can still improved: each time around loop largest number end far can towards end of of array: there's no need check or swap till end each time. using variable upper limit of index i , decreasing value after loop can reduce total number of iterations.

int end = num.length-1; while(swapped){     swapped = false;    for(int i=0;i<end;i++){          if(num[i]>num[i+1]){             int temp = num[i];             num[i] = num[i+1];             num[i+1] = temp;             swapped = true;         }     }     end--;  }