Question

How to convert a character (flatten) matrix to a single string in Java

Answer 1

import java.util.List;
import java.util.Arrays;

public class Main {

    public static String flattenMatrix(List<List<Character>> matrix) {
        StringBuilder sb = new StringBuilder();

        for (List<Character> row : matrix) {
            for (char c : row) {
                sb.append(c);
            }
        }

        return sb.toString();
    }

    public static void main(String[] args) {
        List<List<Character>> matrix = Arrays.asList(
            Arrays.asList('H','e','l','l','o'),
            Arrays.asList(' ','W','o','r','l','d'),
            Arrays.asList('!')
        );

        String output = flattenMatrix(matrix);

        System.out.println("Flattened string: " + output);
    }
}



/*
run:

Flattened string: Hello World!

*/

 

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