Matrice Sur Java

import java.util.function.BiFunction;

public class Matrix {
    private final int width;
    private final int height;
    private final double[][] datas;

    public Matrix(int width, int height) {
        this.width = width;
        this.height = height;
        this.datas = new double[width][height];
    }

    public void setData(int i, int j, double data) {
        datas[i][j] = data;
    }

    public double getData(int i, int j) {
        return datas[i][j];
    }

    public int getWidth() {
        return width;
    }

    public int getHeight() {
        return height;
    }

    public static Matrix assignAll(Matrix matrix, BiFunction<Integer, Integer, Double> assignation) {
        for (int i = 0; i < matrix.getWidth(); i++) {
            for (int j = 0; j < matrix.getHeight(); j++) {
                matrix.setData(i, j, assignation.apply(i, j));
            }
        }
        return matrix;
    }

    public static Matrix product(Matrix matrix, double n) {
        return assignAll(new Matrix(matrix.getWidth(), matrix.getHeight()),
                (i, j) -> matrix.getData(i, j) * n);
    }

    public static Matrix sum(Matrix matrix1, Matrix matrix2) {
        return assignAll(new Matrix(matrix1.getWidth(), matrix1.getHeight()),
                (i, j) -> matrix1.getData(i, j) + matrix2.getData(i, j));
    }
}