how to convert for each loop into lambda for each?

I have the code below where i take an array of string and i convert to an array of char.
How can i transform it so i use the lambda function?

    int m = 1;
    for (String v : value) if (v.length() >= m) m = v.length();
    char[][] a = new char[value.length][m];
    for (int i = 0; i < value.length; i++) a[i] = value[i].toCharArray();
    return countOcc(a);
 }

i tried using Arrays.stream().foreach() like below but when i do things like c++ it gives me an error

    public final int countOcc (String[] value) {
    int m = 1;
    Arrays.stream(value).forEach(e -> {
        if (e.length() >= m) m = e.length();
    });
    char[][] a = new char[value.length][m];
    int c = 0;
    Arrays.stream(value).forEach(e -> {
        a[c] = e.toCharArray();
        c++;
    });
    return countOcc(a);
}

>Solution :

If you are trying to convert a String[] to a char[][] then do something like:

String[] value = {"foo", "bar", "fizz"};
char[][] a = Arrays.stream(value).map(s -> s.toCharArray()).toArray(char[][]::new);

then call your other method

return countOcc(a);