How to initialize all the elements of an array to any specific value in java

If it's a primitive type, you can use Arrays.fill():

Arrays.fill(array, -1);

[Incidentally, memset in C or C++ is only of any real use for arrays of char.]

There's also

int[] array = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};