java - Converting char[][] to char[]

Question

My goal is to print a new string like

char[] result = someArray();
System.out.print(new string(result))

I am working with 2 dimentional array in my task char[][]

I would like to convert my char[][] array to char[]

How do I either print a single string directly from char[][] or easily convert it to char[]?

Arrays.toDeepString() does not work for me as it prints in the format [[a,b,c],[d,e,f]] and I am looking for an output that is abcdef

question from:https://stackoverflow.com/questions/65891667/converting-char-to-char

Answer 1

2D arrays of chars can be easily converted into single string using String(char[]) constructor for each "row" array of chars followed by joining the resulting strings:

static String singleString(char[][] arr) {
    return Arrays.stream(arr)
                 .map(String::new)
                 .collect(Collectors.joining(""));
}

"Streamless" version using StringBuilder may look as follows:

static String singleString(char[][] arr) {
    StringBuilder sb = new StringBuilder(arr.length * (arr.length > 0 ? arr[0].length : 0));
    for (char[] row : arr) {
        sb.append(new String(row));
    }
    return sb.toString();
}