小编Eri*_*nez的帖子

我在视图中有一个表单,它执行自动完成和gmap本地化的ajax部分处理.我的支持bean实例化一个实体对象"Address",并且该对象引用了表单的输入:

@ManagedBean(name="mybean")
@SessionScoped
public class Mybean implements Serializable {
    private Address address;
    private String fullAddress;
    private String center = "0,0";
    ....

    public mybean() {
        address = new Address();
    }
    ...
   public void handleAddressChange() {
      String c = "";
      c = (address.getAddressLine1() != null) { c += address.getAddressLine1(); }
      c = (address.getAddressLine2() != null) { c += ", " + address.getAddressLine2(); }
      c = (address.getCity() != null) { c += ", " + address.getCity(); }
      c = (address.getState() != null) { …

我有一个Matrix类,我想将一个数组传递给构造函数,以便动态设置矩阵的值.我发现如果我分配这样的数组:

double **array;
array = new double*[3];
array[0] = new double[2];
array[1] = new double[2];
array[2] = new double[2];
array[0][0] = 1;
array[0][1] = 1;
array[1][0] = 1;
array[1][1] = 1;
array[2][0] = 1;
array[2][1] = 1;

我可以使用如下方法获取行数和列数:

int getNRows(double **data){
  int size = 0;
  while(*(data+size)){size++;}
  return size;
}

int getNCols(double **data){
  int size = 0;
  while(**(data+size)){size++;}
  return size;
}

这样可以,还是应该坚持使用矢量声明？