用java实现层次分析法

层次分析法（AHP）可以使用Java实现，以下是一个基本的Java代码模板：

public class AHP {

  private double[] weights;

  public AHP(double[][] matrix) {

    int size = matrix.length;
    double[] sumCols = new double[size];

    //计算每列的和
    for (int c = 0; c < size; c++) {
      double colSum = 0;
      for (int r = 0; r < size; r++) {
        colSum += matrix[r][c];
      }
      sumCols[c] = colSum;
    }

    //计算矩阵的归一化版本
    double[][] normMatrix = new double[size][size];
    for (int r = 0; r < size; r++) {
      for (int c = 0; c < size; c++) {
        normMatrix[r][c] = matrix[r][c] / sumCols[c];
      }
    }

    //计算每行的平均值
    double[] rowAverages = new double[size];
    for (int r = 0; r < size; r++) {
      double rowSum = 0;
      for (int c = 0; c < size; c++) {
        rowSum += normMatrix[r][c];
      }
      rowAverages[r] = rowSum / size;
    }

    //归一化平均值
    double rowSum = 0;
    for (int r = 0; r < size; r++) {
      rowSum += rowAverages[r];
    }
    for (int r = 0; r < size; r++) {
      rowAverages[r] /= rowSum;
    }

    weights = rowAverages;

  }

  public double[] getWeights() {
    return weights;
  }

}

这个代码段实现了一个简单的AHP算法，它接受一个二维数组，其中包含要进行层次分析的项目的重要性矩阵，并计算每个项目的权重。