My requirement came when I was doing a chess problem wherein 8X8 character values were given through System.in. I was testing it and all the time I was giving 64 inputs that was pretty hard. Now, I wanted to keep the same in a text file and read it and store it in a character array. Please help me to do so. There are multiple ways those just read and display the contents of the file or we can convert into a 1D char array. But, I was wondering that it can be directly converted from a StringBuilder to a 2D character array.!!! Here is what I have tried.
StringBuilder c = new StringBuilder();
File f = new File("file\\input.txt");
FileInputStream br = new FileInputStream(f);
int str;
while ((str = br.read()) != -1) {
c.append((char) str);
}
br.close();
System.out.println(c);
int strBegin = 0;
for (int i = 0; i < input.length; i++) {
for (int j = 0; j < input.length; j++) {
input[i][j] = c.substring(strBegin, strBegin + 1).toCharArray()[0];
strBegin++;
}
}
for (int i = 0; i < input.length; i++) {
for (int j = 0; j < input.length; j++) {
System.out.print(input[i][j] + " ");
}
System.out.println();
}
Here, the contents of the file input.txt:
2345678
1 345678
12 45678
123 5678
1234 678
12345 78
123456 8
1234567
Note: There is a diagonal space that also has to be stored into the array.
When I run the code, I get this:
2345678
1 345678
12 45678
123 5678
1234 678
12345 78
123456 8
1234567
2 3 4 5 6 7 8
1 3 4 5 6
8
1 2 4
6 7 8
1 2
5 6 7 8
1 2 3 4 6 7 8
1 2 3 4 5
8
1 2 3 4
Rather than reading character by character I suggest you read a whole line directly and convert it to an array of char afterwards
public static char[][] readChessFile(String filename) throws IOException {
char[][] input = new char[8][8];
try (BufferedReader bufferedReader = new BufferedReader(new FileReader(filename))) {
String line;
for (int i = 0; i < input.length; i++) {
line = bufferedReader.readLine();
if (line == null || line.length() != 8) {
throw new IllegalStateException("File is not in correct format");
}
input[i] = line.toCharArray();
}
}
return input;
}
And here is my test code
try {
char[][] result = readChessFile(filename);
for (int i = 0; i < result.length; i++) {
for (int j = 0; j < result[i].length; j++) {
System.out.print(result[i][j]);
}
System.out.println();
}
} catch (IOException e) {
e.printStackTrace();
}
Here is one way to do it.
I allocate the first part of the two d array via
char[][] chars = new char[8][];
The rest will be assigned from the String.
char[][] chars = new char[8][];
try {
BufferedReader br =
new BufferedReader(new FileReader("input.txt"));
String s;
int i = 0;
while ((s = br.readLine()) != null) {
// assign the converted string array to chars[i]
chars[i++] = s.toCharArray();
}
br.close();
}
catch (IOException ioe) {
ioe.printStackTrace();
}
// now print them out, char by char.
for (int i = 0; i < chars.length; i++) {
for (int k = 0; k < chars[i].length; k++) {
System.out.print(chars[i][k]);
}
System.out.println();
}
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