分类1 适应设计模式

adapter 适配器模式

public class BookCaseIterator {  private BookCase bookcase;  private int idx;  public BookCaseIterator(BookCase bookcase){    this.bookcase = bookcase;    this.idx = 0;  }  public boolean hasNext() {    return this.idx < bookcase.getLength();  }  public Object next() {    return bookcase.get(idx++);  } }

Adaptee

methodA

Target

method1

iterator 枚举模式

BookCaseIterator

aggregate: BookCase

hasNext()next()

Adapter

method1() {  methodA();}

Aggregate

+ Iterator iterator()

使用委托的方案:Adaptee adaptee = new Adaptee();Target target = new Adapter(adaptee );target.method1();

Book

isbnnameauthor

BookCase (书柜)

Book[] books

Iterator iterator() {  return new BookCaseIterator(this);}Book get(int idx) {  return books[idx];}

Adaptee adaptee;

method1() {  adaptee.methodA();}

使用继承的方案:Target target = new Adapter();target.method1();

Iterator

+ boolean hasNext()+ Object next()