calenda.java

日期处理技术 编写一个输出日历程序

package two;

import java.awt.*;
import java.awt.event.*;
import java.util.Calendar;
import java.util.GregorianCalendar;
public class Calenda  extends WindowAdapter implements ActionListener,ItemListener,TextListener{
         private Choice c;
         private TextArea t= new TextArea(8, 30);
         private Frame f;
         private Button b1;
         private Button b2;
         private TextField t1;
         private Panel  p = new Panel();
         public Calenda()
         {
                 f = new Frame("Calendar");
                 f.setLayout(new FlowLayout(FlowLayout.LEFT));
                 p.setLayout(new FlowLayout(FlowLayout.LEFT));
                 p.setSize(5,10);
                 b1 = new Button();
                 b2 = new Button();
                 t1 = new TextField("2005",10);
                 b1.setLabel("+");
                 b1.setSize(5,5);
                 b2.setSize(5,5);
                 b2.setLabel("-");
                 c = new Choice();
                 p.add(b1);
                 p.add(b2);
                 c.setSize(150,10);
                 t1.setSize(170,20);
                 t.setBackground(Color.cyan);
                 c.add("一月");
                 c.add("二月");
                 c.add("三月");
                 c.add("四月");
                 c.add("五月");
                 c.add("六月");
                 c.add("七月");
                 c.add("八月");
                 c.add("九月");
                 c.add("十月");
                 c.add("十一月");
                 c.add("十二月");
                 c.select(1);
                 f.add(c);
                 f.add(t1);
                 f.add(p);
                 f.add(t);
                 f.setResizable(false);
                 f.setSize(250,240);
                 f.setVisible(true);
                 t.setEditable(false);
                 t.setText(getString(Integer.parseInt(t1.getText()),positionmonth(c.getSelectedItem()),1));
                 b1.addActionListener(this);
                 b2.addActionListener(this);
                 c.addItemListener(this);
                 f.addWindowListener(this);
                 t1.addTextListener(this);

         }
         public String getString(int iselYear, int iselMonth, int day)
        {
                GregorianCalendar gc = (GregorianCalendar)GregorianCalendar.getInstance();
                String result = "";
                int todays = 30;
                gc.set(iselYear,iselMonth-1,day);
                result += "日    一   二   三   四   五   六";
                iselMonth = iselMonth-1;
                if(iselMonth==0 || iselMonth==2 || iselMonth==4 || iselMonth==6 || iselMonth== 7 ||iselMonth==9 || iselMonth==11)
                {
                   todays=31;
                }
                if(iselMonth==3 || iselMonth==5 || iselMonth==8 || iselMonth==10)
                {
                   todays=30;
                }
                if(gc.isLeapYear(iselYear)&& iselMonth==1)
                {
                   todays=29;
                }
                if( !gc.isLeapYear(iselYear) && iselMonth==1)
                {
                   todays=28;
                }
                int weeks=gc.get(Calendar.DAY_OF_WEEK)-1;
                String[] count=new String[weeks+todays];
                for(int i=0;i<weeks;i++)
                {
                   count[i]="  ";
                }
           for(int i=weeks,n=1;i<weeks+todays;i++)
           {
                   if(n<=9)
                   count[i]=" "+String.valueOf(n);
                   else
                   count[i]=String.valueOf(n);
                   n++;
                }
           for(int i=0;i<weeks+todays;i++)
           {
                   if(i%7==0)
                    {
                       result += "\r\n\r\n";
                       result += count[i].toString()+ "   ";
                    }
                   else
                           result += count[i].toString()+ "   ";
           }
           return result;

}
 public  int positionmonth(String a)
  {
                 if(a == "一月")
                         return 1;
                 if(a == "二月")
                         return 2;
                 if(a == "三月")
                         return 3;
                 if(a == "四月")
                         return 4;
                 if(a == "五月")
                         return 5;
                 if(a == "六月")
                         return 6;
                 if(a == "七月")
                         return 7;
                 if(a == "八月")
                         return 8;
                 if(a == "九月")
                         return 9;
                 if(a == "十月")
                         return 10;
                 if(a == "十一月")
                         return 11;
                 if(a == "十二月")
                         return 12;
                 return 0;
  }
  public  void actionPerformed(ActionEvent e)
   {
          Object source  = e.getSource();
          int temp = 0;
          if(source == b1)
                  {
                  temp = Integer.parseInt(t1.getText());
                  temp = temp+1;
                  t1.setText(Integer.toString(temp));
                  t.setText(getString(temp,positionmonth(c.getSelectedItem()),1));
                  }
          else if(source == b2)
          {
                  temp = Integer.parseInt(t1.getText());
                  temp = temp-1;
                  t1.setText(Integer.toString(temp));
                  t.setText(getString(temp,positionmonth(c.getSelectedItem()),1));
          }

   }
  public void itemStateChanged(ItemEvent e)
  {
          int temp = 0 ;
          temp = Integer.parseInt(t1.getText());
          t.setText(getString(temp,positionmonth(c.getSelectedItem()),1));
  }
  public void textValueChanged(TextEvent e)
  {
          Object source  = e.getSource();
          int temp = 0;
          if(source == t1)
          {
                  temp = Integer.parseInt(t1.getText());
                  t.setText(getString(temp,positionmonth(c.getSelectedItem()),1));
      }
  }
  public void windowClosing(WindowEvent e)
  {
        System.exit(0);
  }
        public static void main(String[] args)
        {
        	@SuppressWarnings("unused")
			Calenda  calenda = new Calenda();
        }


}