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This exercise is already available in your IntelliJ as a project. What you need to do is described in the comments at the top of the file in src/main/java/.

package basics;

public class Matrix {

    /**
     * Create a matrix from a String.
     *
     * The string if formatted as follow:
     *  - Each row of the matrix is separated by a newline
     *    character \n
     *  - Each element of the rows are separated by a space
     *
     *  @param s The input String
     *  @return The matrix represented by the String
     */
    public static int[][] buildFrom(String s) {
         return null;
    }


    /**
     * Compute the sum of the element in a matrix
     *
     * @param matrix The input matrix
     * @return The sum of the element in matrix
     */
    public static int sum(int[][] matrix) {
         return 0;
    }

    /**
     * Compute the transpose of a matrix
     *
     * @param matrix The input matrix
     * @return A new matrix that is the transpose of matrix
     */
    public static int[][] transpose(int[][] matrix) {
         return null;
    }

    /**
     * Compute the product of two matrix
     *
     * @param matrix1 A n x m matrix
     * @param matrix2 A m x k matrix
     * @return The n x k matrix product of matrix1 and matrix2
     */
    public static int[][] product(int[][] matrix1, int[][] matrix2) {
         return null;
    }
}