//Floor.javaimport java.util.*;/** * 幢面積類 * 表示包含幢面積描述，面積公式和面積 */public class Floor {  //表格列命數組  public final static String[] COLUMN_NAMES={"Description","Formular","Area"};  String description = "" ;  String formula = "";  double area = 0;  public double getArea() {    return area;  }  public String getDescription() {    return description;  }  public String getFormula() {    return formula;  }  public void setArea(double area) {    this.area = area;  }  public void setArea(Double area){    this.area = area.doubleValue();  }  public void setDescription(String description) {    this.description = description;  }  public void setFormula(String formula) {    this.formula = formula;  }  //生成數據的Vector表示方式，供DefaultTableModel來使用  public Vector getDataVector(){    Vector v=new Vector();    v.add(description);    v.add(formula);    v.add(new Double(area));    return v;  }  //獲得Vector對象包含的數據是floor類型的數據,將Vector  //對象轉換成為Floor對象  public static Floor parseFloor(Vector v){    Floor floor=new Floor();    floor.setDescription((String)v.elementAt(0));    floor.setFormula((String)v.elementAt(1));    floor.setArea((Double)v.elementAt(2));    return floor;  }  //將表格列名數組轉換成為Vector對象  public static Vector getColumnNameVector(){    Vector v=new Vector();    for (int i=0;i<COLUMN_NAMES.length;i++){      v.add(COLUMN_NAMES[i]);    }    return v;  }}