```
public int islandPerimeter(int[][] grid) {
int peri = 0;
for(int i = 0; i < grid.length; i++){
for(int j = 0; j < grid[0].length; j++){
if(grid[i][j] == 1){
if(i-1 < 0 || grid[i-1][j] == 0)
peri++;
if(j-1 < 0 || grid[i][j-1] == 0)
peri++;
if(i+1 >= grid.length || grid[i+1][j] == 0)
peri++;
if(j+1 >= grid[0].length || grid[i][j+1] == 0)
peri++;
}
}
}
return peri;
}
```