I'm reading from a text file a word (program) and I want to store it into my 2d array called word1
. To do this, I read in the file and store into a placeholder array. I then convert this placeholder array into a char array so that every letter is split up. I now want to send the individual letter from this char array back to the string array ( word1
) that I created earlier. Ultimately, I want the word1
array to become like this
String word1[][] = {
{"p", "*"}, {"r", "*"}, {"o", "*"}, {"g", "*"}, {"r", "*"}, {"a", "*"}, {"m", "*"},
};
Everything works up until the very last bit where I try to convert the individual letters from the char array back into the word1
array.
FileReader file = new FileReader("C:/Users/Mark/Desktop/Java/Workshop 2/hangman.txt");
BufferedReader reader = new BufferedReader(file);
String text = "";
String line = reader.readLine(); //Keeps reading line after line
while (line != null){
text += line;
line = reader.readLine();
}
String word1[][] = {
{"", "*"}, {"", "*"}, {"", "*"}, {"", "*"}, {"", "*"}, {"", "*"}, {"", "*"},
};
String placeholder[] = text.split("\\s+"); //Converts text into an array
String s = "";
for (String n:placeholder){
s+= n;
}
char[] charArray = s.toCharArray();
for (int i = 0; i < 6; i++){
word1[i][0] = new String(charArray[i]); //This is where problem occurs
}
No String(char)
constructor is defined in String
. So you cannot do :
String word1[][] = ...;
word1[i][0] = new String(charArray[i]); //This is where problem occurs
What you need is String.valueOf(char c)
:
word1[i][0] = String.valueOf(charArray[i]);
To convert back and forth between String
and char[][]
, use these methods:
public static char[][] toCharArray(String text) {
char[][] c = new char[text.length()][2];
for (int i = 0; i < c.length; i++) {
c[i][0] = text.charAt(i);
c[i][1] = '*';
}
return c;
}
public static String toString(char[][] c) {
char[] buf = new char[c.length];
for (int i = 0; i < c.length; i++)
buf[i] = c[i][0];
return new String(buf);
}
Test
char[][] word1 = toCharArray("program");
System.out.println(Arrays.deepToString(word1));
String text = toString(word1);
System.out.println(text);
Output
[[p, *], [r, *], [o, *], [g, *], [r, *], [a, *], [m, *]]
program
Oh sorry, that was supposed to be String
to/from String[][]
:
public static String[][] toArray2D(String text) {
String[][] arr = new String[text.length()][];
for (int i = 0; i < arr.length; i++)
arr[i] = new String[] { text.substring(i, i + 1), "*" };
return arr;
}
public static String toString(String[][] arr) {
StringBuilder buf = new StringBuilder();
for (String[] a : arr)
buf.append(a[0]);
return buf.toString();
}
Test
String[][] word1 = toArray2D("program");
System.out.println(Arrays.deepToString(word1));
String text = toString(word1);
System.out.println(text);
Output
[[p, *], [r, *], [o, *], [g, *], [r, *], [a, *], [m, *]]
program
String text = String.copyValueOf(data);
or
String text = String.valueOf(data);
is better - encapsulates the new String call
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