设计模式＝＝抽象工厂模式（Abstract Factory）

/* * * 抽象工厂模式（Abstract Factory） * *  针对多个产品等级的情况，而工厂方法模式针对单一产品等级的情况。 */package model;import java.awt.Button;import java.awt.Component;import java.awt.FlowLayout;import java.awt.Frame;import java.awt.TextField;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JTextField;public class TestAbstractFactory {    public static void main(String[] args) {        GUIFactory fact = new SwingFactory();        Frame f = fact.getFrame();        Component c1 = fact.getButton();        Component c2 = fact.getTextField();        f.setSize(500, 300);        f.setLayout(new FlowLayout());        f.add(c1);        f.add(c2);        f.setVisible(true);        f.addWindowListener(new WindowAdapter() {            public void windowClosing(WindowEvent e) {                System.exit(0);            }        });    }}abstract class GUIFactory {    public abstract Component getButton();    public abstract Component getTextField();    public abstract Frame getFrame();}class AWTFactory extends GUIFactory {    public Component getButton() {        return new Button("AWT Button");    }    public Frame getFrame() {        return new Frame("AWT Frame");    }    public Component getTextField() {        return new TextField(20);    }}class SwingFactory extends GUIFactory {    public Component getButton() {        return new JButton("Swing Button");    }    public Frame getFrame() {        return new JFrame("Swing Frame");    }    public Component getTextField() {        return new JTextField(20);    }}