I still cant get my head around this: java.lang.NullPointerException
heres my disgusting amount of code and its error report. please help. its basically the board for a twixt game. if you dont know what that is its not important because the error has nothing to do with the rules of the game.
Exception in thread "main" java.lang.NullPointerException
at Board.pcomp(Board.java:81)
at Board.addremovebridge(Board.java:34)
at Twixt.main(Twixt.java:21)
Thanks again for reading this far.
publicclass Twixt{
publicstaticvoid main(String[] args){
Board game =new Board();
point p =new point();
p.x = 4;
p.y = 4;
p.p = 1;
point f =new point();
f.x = 5;
f.y = 6;
p.p = 1;
String s =new String();
s = game.placetower(p);
s = game.placetower(p);
System.out.println(s);
s = game.placetower(f);
System.out.println(s);
s = game.addremovebridge(p,f);
System.out.println(s);
s = game.addremovebridge(p,f);
System.out.println(s);
}
}
publicclass point{
int x = 0;
int y = 0;
int p = 0;
}
import java.lang.Math;
publicclass Board{
publicint[][] board1 =newint[26][26];
public point[][][] board2 =new point[26][26][6];
privateint board3d;
privateint board3e;
/*Board() {
for(int x = 0; x<=25; x++){
for(int i = 0; i<=25; i++){
for(int j = 0; j<=6;j++){
pmakezero(board2[x][i][j]);
}
}
}
}*/
public String placetower(point d){
if (board1[d.x][d.y] == 0){
board1[d.x][d.y] = d.p;
return ("Tower placed at "+d.x+", "+d.y+".");
}else{
return ("That space is already taken.");
}
}
public String addremovebridge(point d, point e){
if(checkplayer(d,e)){
boolean removebridge =false;
for(int i = 0; i<=5;i++){
if(pcomp(board2[d.x][d.y][i], e)){
pmakezero(board2[d.x][d.y][i]);
removebridge =true;
}
if(pcomp(board2[e.x][e.y][i], d)){
pmakezero(board2[e.x][e.y][i]);
removebridge =true;
}
}
if(distance(d,e)&&!intersect(d,e)&&!removebridge&&!full(d,e)){
board2[d.x][d.y][board3d] = e;
board2[e.x][e.y][board3e] = d;
return ("Bridge placed between "+d.x+", "+d.y+" and "+e.x+", "+e.y+".");
}else{
return ("That is not a valid bridge placement.");
}
}else{
return ("That tower does not belong to you.");
}
}
privateboolean distance(point d, point e){
double g;
int f;
int i;
f = d.x - e.x;
i = d.y - e.y;
f = f*f;
i = i*i;
f = f+i;
g = f;
if (g>0){
g = g * -1;
}
g = Math.sqrt(g);
if(g == Math.sqrt(5)){
returntrue;
}else{
returnfalse;
}
}
privateboolean pcomp(point d, point e){
if(d.x == e.x && d.y == e.y){
returntrue;
}else{
returnfalse;
}
}
privatevoid pmakezero(point d){
d.x = 0;
d.y = 0;
d.p = 0;
}
privateboolean checkplayer(point d, point e){
if(board1[d.x][d.y] == d.p && board1[e.x][e.y]==e.p){
returntrue;
}else{
returnfalse;
}
}
privateboolean full(point d, point e){
point x;
int y;
int z;
boolean full =true;
for(int i=0; i<=5; i++){
x = board2[d.x][d.y][i];
y = x.x;
z = x.y;
if(y == 0 && z == 0){
board3d = i;
i = 3;
full =false;
}
}
for(int i=0; i<=3; i++){
x = board2[e.x][e.y][i];
y = x.x;
z = x.y;
if(y == 0 && z == 0){
board3e = i;
i = 3;
full =false;
}
}
return full;
}
privateboolean intersect(point d, point e){
boolean inter =false;
int f;
int h;
f = d.x - e.x;
h = d.y - e.y;
if(f == 2 && h == 1){
if(board1[e.x + 1][e.y]!=0){
for(int w=0;w<=5;w++){
if(board2[e.x + 2][e.y + 2][w]==e){
inter =true;
}elseif(board2[e.x][e.y + 2][w]==e){
inter =true;
}
}
}elseif(board1[d.x - 1][d.y]!=0){
for(int w=0;w<=5;w++){
if(board2[d.x - 2][d.y - 2][w]==d){
inter =true;
}elseif(board2[d.x][d.y - 2][w]==d){
inter =true;
}
}
}elseif(board1[e.x + 2][e.y]!=0){
for(int w=0;w<=5;w++){
if(board2[e.x + 1][e.y + 2][w]==e){
inter =true;
}
}
}elseif(board1[d.x - 2][d.y]!=0){
for(int w=0;w<=5;w++){
if(board2[d.x - 1][d.y - 2][w]==d){
inter =true;
}
}
}
}elseif(f == -2 && h == -1){
if(board1[e.x - 1][e.y]!=0){
for(int w=0;w<=5;w++){
if(board2[e.x - 2][e.y - 2][w]==e){
inter =true;
}elseif(board2[e.x][e.y - 2][w]==e){
inter =true;
}
}
}elseif(board1[d.x + 1][d.y]!=0){
for(int w=0;w<=5;w++){
if(board2[d.x + 2][d.y + 2][w]==d){
inter =true;
}elseif(board2[d.x][d.y + 2][w]==d){
inter =true;
}
}
}elseif(board1[e.x - 2][e.y]!=0){
for(int w=0;w<=5;w++){
if(board2[e.x - 1][e.y - 2][w]==e){
inter =true;
}
}
}elseif(board1[d.x + 2][d.y]!=0){
for(int w=0;w<=5;w++){
if(board2[d.x + 1][d.y + 2][w]==d){
inter =true;
}
}
}
}elseif(f == 1 && h == 2){
if(board1[e.x][e.y + 1]!=0){
for(int w=0;w<=5;w++){
if(board2[e.x + 2][e.y + 2][w]==e){
inter =true;
}elseif(board2[e.x + 2][e.y][w]==e){
inter =true;
}
}
}elseif(board1[d.x][d.y - 1]!=0){
for(int w=0;w<=5;w++){
if(board2[d.x - 2][d.y - 2][w]==d){
inter =true;
}elseif(board2[d.x - 2][d.y][w]==d){
inter =true;
}
}
}elseif(board1[e.x][e.y + 2]!=0){
for(int w=0;w<=5;w++){
if(board2[e.x + 2][e.y + 1][w]==e){
inter =true;
}
}
}elseif(board1[d.x][d.y - 2]!=0){
for(int w=0;w<=5;w++){
if(board2[d.x - 2][d.y - 1][w]==d){
inter =true;
}
}
}
}elseif(f == -1 && h == -2){
if(board1[e.x][e.y - 1]!=0){
for(int w=0;w<=5;w++){
if(board2[e.x - 2][e.y - 2][w]==e){
inter =true;
}elseif(board2[e.x - 2][e.y][w]==e){
inter =true;
}
}
}elseif(board1[d.x][d.y + 1]!=0){
for(int w=0;w<=5;w++){
if(board2[d.x + 2][d.y + 2][w]==d){
inter =true;
}elseif(board2[d.x + 2][d.y][w]==d){
inter =true;
}
}
}elseif(board1[e.x][e.y - 2]!=0){
for(int w=0;w<=5;w++){
if(board2[e.x - 2][e.y - 1][w]==e){
inter =true;
}
}
}elseif(board1[d.x][d.y + 2]!=0){
for(int w=0;w<=5;w++){
if(board2[d.x + 2][d.y + 1][w]==d){
inter =true;
}
}
}
}
return inter;
}
}
Thank you.
