public String name=\ public String name1=\ // public Book book;
public Book book=new Book(); public Zhangsan() {
this.name=\ this.book=new Book(); }
public Object clone() {
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try {
return super.clone(); }
catch(CloneNotSupportedException e) {
return null; } }
public Object deepClone() throws IOException,OptionalDataException,ClassNotFoundException {
ByteArrayOutputStream bo=new ByteArrayOutputStream(); ObjectOutputStream oo=new ObjectOutputStream(bo); oo.writeObject(this);
ByteArrayInputStream bi=new ByteArrayInputStream(bo.toByteArray()); ObjectInputStream oi=new ObjectInputStream(bi); return (oi.readObject()); }
public Book getBook() {
return book; }
public String getName() {
return name; } }
/**--------------------------------------------------------------------------------**/ import java.io.*;
import java.io.Serializable;
public class Zhangsan implements Cloneable,Serializable {
public String name=\ public String name1=\ // public Book book;
public Book book=new Book(); public Zhangsan() {
this.name=\ this.book=new Book(); }
public Object clone()
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{
try {return super.clone(); }
catch(CloneNotSupportedException e) {
return null; } }
public Object deepClone() IOException,OptionalDataException,ClassNotFoundException {
ByteArrayOutputStream bo=new ByteArrayOutputStream(); ObjectOutputStream oo=new ObjectOutputStream(bo); oo.writeObject(this);
ByteArrayInputStream bi=new ByteArrayInputStream(bo.toByteArray()); ObjectInputStream oi=new ObjectInputStream(bi); return (oi.readObject()); }
public Book getBook() {
return book; }
public String getName() {
return name; } }
/**--------------------------------------------------------------------------------**/ public class test {
public static void main(String args[]) {
Zhangsan person=new Zhangsan();
Zhangsan copy= ( Zhangsan) person.clone(); System.out.println(person.name); System.out.println(copy.name);
System.out.println(\ \ System.out.println(\of \
try {
Zhangsan deepcopy= (Zhangsan) person.deepClone(); System.out.println(\of
throws false??? false??? 18
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\ System.out.println(\of false??? \
System.out.println(\ \ System.out.println(\ \ System.out.println(person.book.pages);
System.out.println(\ \ System.out.println(deepcopy.book.pages);
System.out.println(\ \ } catch (Exception e) {
System.out.println(\ } } }
所谓clone有深clone和浅clone
博士使用的利用串行化来进行深clone，但是不能保证深clone得到的结果是正确的，这是因为有些不能串行化的，比如说，如果这个zhangsan类它继承了一个abstract class,或者implements 一些接口，而 abstract class或接口有常量等不能串行化的东西，深clone可能会失败（deepClone方法本身没有失败，可是要访问clone的对象的属性时可能会失败！）
8，composite模式理解
composite模式就是把一些具有相类似的接口的类组合起来，提供一致的访问接口
三个角色
1，抽象构件component 2，Leaf
3,树枝角色compostie
public interface Component{
public Composite getComposite(); public void mehod1(); }
import java.until.*;
public class Composite implements Component{ private Vector vector_com=new vector(); public Composite getComposite() {
return this;
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}
public void mehod1(){
System.out.println(\
Emumeration emumeration=vector_com.elements(); while(emumeration.hasMoreElements()){
((Component ) emumeration.nextElement()).method1(); } }
public void add(Component component) {
vector_com.add(component); }
public void remove(Component component) {
vector_com.removeElement(component); } }
public class Leaf implements Component {
public void method1() {
System.out.println(\}
public Composite getComposite() {
return null; } }
9，迭代子模式理解
/************************************************************************/
public abstract class Aggregate {
public Iterator createIterator() {
return null; } }
/********************************************************************
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****/
public interface Iterator { void first(); void next();
boolean isDone(); Object currentItem(); }
/************************************************************************/
public class ConcreteAggregate extends Aggregate{
private Object[] obj={\唐僧\孙悟空\猪八戒\沙僧\白龙马\妖怪\public Iterator createIterator() {
return new ConcreteIterator(this); }
public Object getElement(int index) {
if(index public int size() { return obj.length; } } /************************************************************************/ public class ConcreteIterator implements Iterator { private ConcreteAggregate agg; private int index=0; private int size=0; public ConcreteIterator(ConcreteAggregate agg) { this.agg=agg; this.size=agg.size(); index=0; } public void first(){ index=0; } public void next(){ 21 设计模式 if(index index++; } } public boolean isDone(){ return (index>=size); } public Object currentItem(){ return agg.getElement(index); } } /************************************************************************/ public class Client { private Iterator it; private Aggregate agg=new ConcreteAggregate(); public void operation() { it=agg.createIterator(); while(!it.isDone()) {