write（）方法中的空值：Hadoop MapReduce中的自定义数据类型

Question

我发出两个2D双数组作为键和值。我正在构建WritableComparable类。

public class MF implements WritableComparable<MF>{

/**
 * @param args
 */
private double[][] value;

public MF() {
    // TODO Auto-generated constructor stub
}

public MF(double[][] value) {
    // TODO Auto-generated constructor stub

      this.value = new double[value.length][value[0].length];
    // System.out.println("in matrix");
}

public void set(double[][] value) {
      this.value = value;
}

public double[][] getValue() {
        return value;
}

@Override
public void write(DataOutput out) throws IOException {
    System.out.println("write");
    int row=0;
    int column=0;
    for(int i=0; i<value.length;i++) {
        row = value.length;
        for(int j=0; j<value[i].length; j++) {
            column = value[i].length;
        }
    }
    out.writeInt(row);
    out.writeInt(column);

    for(int i=0;i<row ; i++) {
        for(int j= 0 ; j< col;j++) {
            out.writeDouble(value[i][j]);
        }
    }

    for(int i =0;i< value.length ;i ++) {
        for(int j = 0;j <value[0].length;j++) {
            System.out.print(value[i][j]+ "\t");
        }
        System.out.println("");
    }
}

@Override
public void readFields(DataInput in) throws IOException {
    int row = in.readInt();
    int col = in.readInt();

    double[][] value = new double[row][col];
    for(int i=0;i<row ; i++) {
        for(int j= 0 ; j< col;j++) {
            value[i][j] = in.readDouble();
        }
    }
}

@Override
public int hashCode() {

}

@Override
public boolean equals(Object o) {

}

@Override
public int compareTo(MF o) {
    // TODO Auto-generated method stub
    return 0;
}

@Override
public String toString() {
    System.out.println(Arrays.toString(value));
    return Arrays.toString(value);
}
}

中途，当我尝试在write方法中打印矩阵时，矩阵没有值

write
    0.0 0.0 0.0 
    0.0 0.0 0.0 
    0.0 0.0 0.0 
write
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 

我做错了什么。我没有任何行和列。