java - "cannot find symbol [method name]"尽管声明了该方法

Question

以下代码

class Matrix {
  private int[][] matrice;
  public Matrix(int[][] matrice){
    this.matrice = matrice;
  }
  public int rows(){
    return matrice.length;
  }
  public int columns(){
    return matrice[0].length;
  }
  public Matrix add(Matrix secondMatrix){
    int[][] sum = new int[matrice.rows()][matrice.columns()]; //ERROR
    Matrix result = new Matrix(sum);
    return result;
  }
}

当我声明“sum”数组时，返回两个错误，因为它“找不到符号方法 rows()”或“方法 columns()”。可能是什么问题？

Answer 1

应该改变这个

来自:

int[][] sum = new int[matrice.rows()][matrice.columns()];

致:

int[][] sum = new int[secondMatrix.rows()][secondMatrix.columns()];