DOC《实验报告》

实验报告 课程: 设计模式实验 学期: 2010-2011学年 第一学期 任课教师: 专业: 软件工程 学号:姓名:成绩: 实验5 单件模式 1.

题目: 分别使用同步getInstance()方法、急切实例化、双重检查加锁三种方法实现课本中的巧克力锅炉. 2.模式设计的UML类图: 3.程序源代码: (1)巧克力锅炉类Boiler.java: package singleton;

public class Boiler { protected boolean empty;

protected boolean boiled;

public void fill() { if(isEmpty()) { empty = false;

boiled = false;

} } public String drain() { if(!isEmpty() && isBoiled()) { empty = true;

return "咖啡和牛奶已经煮好了.";

} else return "咖啡和牛奶没有煮好.";

} public void boil() { if(!isEmpty() && !isBoiled()) { boiled = true;

} } public boolean isEmpty() { return empty;

} public boolean isBoiled() { return boiled;

} } (2)同步方法实现巧克力锅炉的类SynchronizedChocolateBoiler.java: package singleton;

public class SynchronizedChocolateBoiler extends Boiler { private static SynchronizedChocolateBoiler uniqueInstance;

private SynchronizedChocolateBoiler() { empty = true;

boiled = false;

} public static synchronized SynchronizedChocolateBoiler getInstance() { if(uniqueInstance == null) { uniqueInstance = new SynchronizedChocolateBoiler();

} return uniqueInstance;

} } (3)急切实例化实现巧克力锅炉的类EagerlyChocolateBoiler.java: package singleton;

public class EagerlyChocolateBoiler extends Boiler { private static EagerlyChocolateBoiler uniqueInstance = new EagerlyChocolateBoiler();

private EagerlyChocolateBoiler() { empty = true;

boiled = false;

} public static EagerlyChocolateBoiler getInstance() { return uniqueInstance;

} } (4)双重检查加锁实现巧克力锅炉的类DCLChocolateBoiler.java: package singleton;

public class DCLChocolateBoiler extends Boiler { private volatile static DCLChocolateBoiler uniqueInstance;

private DCLChocolateBoiler() { empty = true;

boiled = false;

} public static DCLChocolateBoiler getInstance() { if(uniqueInstance == null) { synchronized(DCLChocolateBoiler.class) { if(uniqueInstance == null) { uniqueInstance = new DCLChocolateBoiler();

} } } return uniqueInstance;

} } (5)实现用户界面的主类ChocolateBoiler.java: (由于代码过长,只列出重要部分) package singleton;

public class ChocolateBoiler extends javax.swing.JFrame { public ChocolateBoiler() { super(XXXXXX);

initComponents();

} private void initComponents() { jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder("锅炉实现类型"));

buttonGroup1.add(jRadioButton1);

jRadioButton1.setText("同步实现");

buttonGroup1.add(jRadioButton2);

jRadioButton2.setText("急切实例化");

buttonGroup1.add(jRadioButton3);

jRadioButton3.setText("双重检查加锁");

jPanel2.setBorder(javax.swing.BorderFactory.createTitledBorder("咖啡加工"));

buttonGroup2.add(jRadioButton4);

jRadioButton4.setText("加料");

buttonGroup3.add(jRadioButton5);

jRadioButton5.setText("煮沸");

jPanel3.setBorder(javax.swing.BorderFactory.createTitledBorder("消息输出"));

jLabel1.setText("消息:");

jTextField1.setText("");

jButton1.setText("退出");

jButton2.setText("清空");

jButton3.setText("确定");

}// private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { System.exit(0);

} private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { jTextField1.setText("");

buttonGroup1.clearSelection();

buttonGroup2.clearSelection();

buttonGroup3.clearSelection();

buttonGroup4.clearSelection();

} private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) { String[] str = Boiler();

String infor = str[0]str[1];

jTextField1.setText(infor);

} public String[] Boiler() { String[] str = new String[2];

Boiler boiler = null;

if(jRadioButton1.isSelected()) { boiler = SynchronizedChocolateBoiler.getInstance();

str[1] = "(同步实现)";

} else if(jRadioButton2.isSelected()) { boiler = EagerlyChocolateBoiler.getInstance();

str[1] = "(急切实例化)";

} else if(jRadioButton3.isSelected()) { boiler = DCLChocolateBoiler.getInstance();

str[1] = "(双重检查加锁)";

} if(jRadioButton4.isSelected()&&!jRadioButton5.isSelected()) { boiler.boil();

str[0] = boiler.drain();

} else if(jRadioButton5.isSelected()&&!jRadioButton4.isSelected()) { boiler.fill();

str[0] = boiler.drain();

} else if(jRadioButton4.isSelected()&&jRadioButton5.isSelected()) { boiler.fill();

boiler.boil();

str[0] = boiler.drain();

} else if(!jRadioButton4.isSelected()&&!jRadioButton5.isSelected()) { str[0] = boiler.drain();

} return str;

} public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new ChocolateBoiler().setVisible(true);

} });

} } 4.实验结果截图: