查找二维数组java的总和

我建议您这样做：

int perTotal = 0;// top and bottom rowfor (int c = 0; c < numCols; c++)    perTotal += matrix[0][c] + matrix[numRows-1][c];// left and right columnfor (int r = 1; r < numRows-1; r++)    perTotal += matrix[r][0] + matrix[r][numCols-1];// outputSystem.out.println("Perimeter=" + perTotal);