java - MinMaxAI checkers implementation -

i can't seem min max ai work. code far. error saying allscores array empty won't set move bestscored move. appreciated.

int[] move;  public static int makemove(board board, int currentplayercolor, int maxingplayercolor){      int score = 0;     int[] moveindex={};      if (rules.gameover(board)[0]==1){          if(rules.gameover(board)[1] == maxingplayercolor){             system.out.println("1");             return score = 1;         } else if(rules.gameover(board)[1] == math.abs(maxingplayercolor-1)) {             system.out.println("-1");             return score = -1;         } else{             system.out.println("0");             return score = 0;         }      } else {          int[][] availablemoves = board.availablemoves(board, currentplayercolor);         int[] allscores = {};          system.out.println("loop length: "+ availablemoves.length);          for(int x = 0; x<availablemoves.length; x++){             board temp = board;              if(currentplayercolor == maxingplayercolor){                 board.domove(availablemoves[x], temp, 7);             } else {                 board.domove(availablemoves[x], temp, 0);             }              system.out.println(""+x);              allscores = add(makemove(temp,math.abs(maxingplayercolor-1), maxingplayercolor), allscores);              system.out.println("allscore len "+ allscores.length);          }          if(currentplayercolor == maxingplayercolor){              for(int x = 0; x<allscores.length; x++){                 if(score < allscores[x]){                     allscores = add(score, allscores);                 }             }              for(int x = 0; x<allscores.length; x++){                 if(score == allscores[x]){                     moveindex = add(x,moveindex);                 }             }              system.out.println("max "+moveindex.length);             move = availablemoves[rand.nextint(moveindex.length)];          } else {              for(int x = 0; x<allscores.length; x++){                 if(score > allscores[x]){                     score = allscores[x];                 }             }              for(int x = 0; x<allscores.length; x++){                 if(score == allscores[x]){                     moveindex = add(x,moveindex);                 }             }              system.out.println("min "+moveindex.length);             move = availablemoves[rand.nextint(moveindex.length)];          }      }      return 0; } 

you're trying add elements onto array

allscores = add(... 

but isn't how works. can't add elements onto array, can change existing elements.

so when make array, have this:

int[] allscores = {}; 

but creates empty array , can't that. instead, declare this:

int[] allscores = new int[size]; 

replacing size number of elements want array hold.

then can access , change elements this:

allscores[index] = somenumber; 

there formatting , syntax errors. try using text editor or ide includes syntax highlighting find easy mistakes.

also read on this guide learn arrays.