person.java

源码为科学出版社出版的英文<java设计模式>(影印版)所用的所有例子程序

//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.*;
import java.awt.GraphicsEnvironment;

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
  private Button setFontButton;
  public Label zyjLabel = new bLabel("First name");

  NameFactory nfactory;
  Namer namer;

  public Person() {
    super("Name Divider");
    setGUI();
    nfactory = new NameFactory();
  }

  //---------------------------------
  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(zyjLabel);
//    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");
    setFontButton = new Button("设置字体");
    Compute.addActionListener(this);
    Clear.addActionListener(this);
    Close.addActionListener(this);
    setFontButton.addActionListener(this);

    pb.add(Compute); //add the buttons
    pb.add(Clear);
    pb.add(Close);
    pb.add(setFontButton);
    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();
    }
    if (obj == setFontButton) {
      openFontChooser();
    }
  }

  //---------------------------------
  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("");
  }

  //---------------------------------
  private void openFontChooser() {
    FontChooser fontChooser = FontChooser.showFontChooser(this, "Select Font", true);
    if (fontChooser.select) {
      zyjLabel.setFont(fontChooser.getSelectFont());
      repaint();
      zyjLabel.repaint();
    }
  }

  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);
    GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
    String[] familynames = env.getAvailableFontFamilyNames();
    Font font = new Font("幼圆", Font.BOLD, 15);
    setFont(font);
  }
}
//=========================================