person.java

java设计模式中的简单工厂模式的一个案例代码。

//Javatecture II  - Illustration of Factory pattern
//James W. Cooper
//This application puts up a user interface where you
//can enter a name and have the program split it into first and last names
import java.awt.*;
import java.awt.event.*;

public class Person extends Frame
   implements ActionListener
{
  private TextField entryField;            //user interface input field
  private TextField txFirstName, txLastName;  //output fields
  private Button Compute, Clear;
	private Button Close;   //control buttons
  NamerFactory nfactory;
  Namer namer;

  public Person()
  {
     super("Name Divider");
     setGUI();
     nfactory = new NamerFactory();
  }
  //---------------------------------
  private void setGUI()
  {
   setLayout(new BorderLayout());
   setBackground(Color.lightGray);

   Panel p = new Panel();
   add("Center", p);
   p.setLayout(new GridLayout(2,1)); //2 areas in middle for entry and results
   
   //upper panel has entry field and label
   Panel p1 = new Panel();
   Panel p2 = new Panel();
   p.add(p1);
   p.add(p2);

   p1.add(new bLabel("Enter name:"));
   entryField = new TextField(30);
   p1.add(entryField);

   //lower panel has split names in two fields
   txFirstName = new TextField(25);
   txLastName = new TextField(25);
   p2.add(new bLabel("First name"));
   p2.add(txFirstName);
   p2.add(new bLabel("Last name"));
   p2.add(txLastName);

   //bottom border has 3 buttons in a Panel
   Panel pb = new Panel();
   add("South", pb);
   Compute = new Button("Compute");
   Clear = new Button("Clear");
   Close = new Button("Close");
   Compute.addActionListener(this);
   Clear.addActionListener(this);
   Close.addActionListener(this);

   pb.add(Compute);                 //add the buttons
   pb.add(Clear);
   pb.add(Close);
   setBounds(100, 100, 300, 300);
   setVisible(true);
   entryField.requestFocus();
  }
  //---------------------------------
  public void actionPerformed(ActionEvent e)
  {
   Object obj = e.getSource();
   if (obj == Clear)                //clear the fields
      clearFields();
   if(obj == Close)                 //exit from he program
      System.exit(0);
   if (obj == Compute)              //compute the name
      computeName();
  }
  //---------------------------------
  private void computeName() {
      namer = nfactory.getNamer (entryField.getText());
      txFirstName.setText(namer.getFirst ());
      txLastName.setText(namer.getLast ());
  }
    //---------------------------------
  private void clearFields()
  {
     //clear out all the text fields
     entryField.setText("");
     txFirstName.setText("");
     txLastName.setText("");
  }
  //---------------------------------
  static public void main(String[] argv)
  {
     new Person();
  }
}
//=========================================
class bLabel extends Label
{
   //this class creates blue labels
   public bLabel(String tx)
   {
      super(tx);
      setForeground(Color.blue);
   }
}
//=========================================