datebean.java~7~

java bean 编程程序

package chapter8;

import java.util.*;

import java.awt.*;
import javax.swing.*;

public class DateBean extends JLabel{
  private Calendar c = Calendar.getInstance();
  private int m, d, y, e;
  private String month, day, year, era, month_str;

  // three of the five properties surfaced by the bean.  Font and Background
  // are the other two and they are inherited from the parent object and don't
  // need local representation
  private boolean useMonthString;
  private Color fontColor;
  private int style;
  private int align;
  private boolean inverse;

  // constants used by bean and it's BeanInfo and Customizer
  public static final int MONTH_DAY_YEAR     = 1;
  public static final int MONTH_DAY_YEAR_ERA = 2;
  public static final int YEAR_MONTH_DAY     = 3;
  public static final int MONTH_YEAR         = 4;
  public static final int DAY_MONTH_YEAR     = 5;
  public static final String[] allMonths = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
                                     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};

  public DateBean() {
      m = c.get(Calendar.MONTH) + 1;
      d = c.get(Calendar.DATE);
      y = c.get(Calendar.YEAR);
      e = c.get(Calendar.ERA);

      if(m <= 9)
        month = "0" + String.valueOf(m);
      else
        month = String.valueOf(m);

      if(d <=9)
        day = "0" + String.valueOf(d);
      else
        day = String.valueOf(d);

      year = String.valueOf(y);
      month_str = allMonths[m - 1];

      // AD or BC -- it might matter when Java builds time machines!
      if(e == 1)
        era = "AD";
      else
        era = "BC";

      setStyle(MONTH_DAY_YEAR_ERA);
      useMonthString = false;
  }

  /**
   * fontColor makes more descriptive sense then foreground and we'll hide
   * foreground with BeanInfo
   *
   * @param newFontColor Color
   */
  public void setFontColor(Color newFontColor) {
    super.setForeground(newFontColor);
  }

  public Color getFontColor() {
      return super.getForeground();
  }

  public void setFont(Font newFont) {
    super.setFont(newFont);
  }

  public Font getFont() {
      return super.getFont();
  }

  /**
   * just overridden from the parent
   *
   * @param newBackground Color
   */
  public void setBackground(Color newBackground) {
    super.setBackground(newBackground);
  }

  public Color getBackground() {
      return super.getBackground();
  }

  /**
   * style is handled in the designer with a new Enumeration Property from the
   * BeanInfo
   *
   * @param newStyle int
   */
  public void setStyle(int newStyle) {
    style = newStyle;

    switch(style){
      case MONTH_DAY_YEAR:
        if(useMonthString)
          this.setText(month_str + " " + day + ", " + year);
        else
          this.setText(month + " / " + day + " / " + year);
        break;

      case MONTH_DAY_YEAR_ERA:
        if(useMonthString)
          this.setText(month_str + " " + day + ", " + year + " " + era);
        else
          this.setText(month + " / " + day + " / " + year + " " + era);
        break;

      case YEAR_MONTH_DAY:
        if(useMonthString)
          this.setText(year + " " + month_str + " " + day);
        else
          this.setText(year + " / " + month + " / " + day);
        break;

      case MONTH_YEAR:
        if(useMonthString)
          this.setText(month_str + " " + year);
        else
          this.setText(month + " / " + year);
        break;

      case DAY_MONTH_YEAR:
        if(useMonthString)
          this.setText(day + " " + month_str + " " + year);
        else
          this.setText(day + " / " + month + " / " + year);
        break;

      default:
        this.setText("invalid");
    }
  }

  public int getStyle() {
      return style;
  }

  public void setUseMonthString( boolean x ){
    useMonthString = x;
    this.setStyle(this.getStyle());
  }

  public void setInverse(boolean inverse) {
    this.inverse = inverse;
    if(inverse)
    {
        super.setBackground(Color.RED);
    }
    else
    {
       super.setBackground(Color.WHITE);
    }
  }

    public void setAlign(int align)
    {
        this.align = align;
        if (align == 1) {
          super.setHorizontalAlignment(LEFT);
        }
        else if(align == 2)
        {
          super.setHorizontalAlignment(CENTER);
        }
        else
        {
          super.setHorizontalAlignment(RIGHT);
        }
    }

    public boolean getUseMonthString(){
    return useMonthString;
  }

  public boolean isInverse() {
    return inverse;
  }

    public int getAlign()
    {
        return align;
    }

}