(完整版)设计模式

设计题编写代码比较使用迭代器遍历链表和使用get(int index)方法遍历链表所有的时间。

mport java.util.*;public class TestSpeed {public static void main(String[] args) {LinkedList<String> list = new LinkedList<String>();for (int i = 0; i <= 60096; i++) {list.add("speed" + i);}Iterator<String> iter = list.iterator();long starttime = System.currentTimeMillis();while (iter.hasNext()) {String te = iter.next();}long endTime = System.currentTimeMillis();;long result = endTime - starttime;System.out.println("使用迭代遍历集合所用时间" + result + "毫秒");starttime = System.currentTimeMillis();for (int i = 0; i < list.size(); i++) {String te = list.get(i);}endTime = System.currentTimeMillis();result = endTime - starttime;System.out.println("使用get方法历集合所用时间" + result + "毫秒");}}编写饿汉式和懒汉式单件模式示意代码，并说明这两种方式的适应性。

（1）饿汉式：public class Singleton {private static Singleton unigueInstance = new Singleton();private Singleton() {}public static Singleton getInstance() {return unigueInstance;}}（2）懒汉式：public class Singleton {private static Singleton unigueInstance;private Singleton() {}public static synchronized Singleton getInstance() {if (unigueInstance == null) {unigueInstance = new Singleton();}return unigueInstance;}}以下你看到的类和接口是取自一个动作冒险游戏，它们代表游戏角色(Character)的类和角色可以使用的武器行为的类。

每个角色一次只能使用一种武器，但是可以在游戏的过程中换武器。

你的工作是使用策略模式实现该游戏的架构。

public abstract class Character {WeaponBehavior weapon;public void performWeapon() {eWeapon();}public abstract void fight();public void setWeaponBehavior(WeaponBehavior w) {this.weapon = w;}}public class Queen extends Character {public Queen() {weapon = new KnifeBehavior();}public void fight() {System.out.println("皇后在战斗。

");}}public class King extends Character {public King(){w eapon=new SwordBehavior();}public void fight() {System.out.println("国王在战斗。

");}}public class Troll extends Character {public Troll() {weapon = new BowAndArrowBehavior();}public void fight() {System.out.println("妖怪在战斗。

");}}public class Knight extends Character {public Knight() {weapon = new AxeBehavior();}public void fight() {System.out.println("骑士在战斗。

");}}public interface WeaponBehavior {public void useWeapon();}public class KnifeBehavior implements WeaponBehavior { public void useWeapon() {System.out.println("使用匕首战斗！");}}public class BowAndArrowBehavior implements WeaponBehavior { public void useWeapon() {System.out.println("使用弓箭战斗！");}}public class AxeBehavior implements WeaponBehavior { public void useWeapon() {System.out.println("使用斧头战斗！");}}public class SwordBehavior implements WeaponBehavior { public void useWeapon() {// TODO Auto-generated method stubSystem.out.println("使用宝剑战斗！");}}public class Game {public static void main(String[] args) {//King king=new King();Character king=new King();//显示谁在战斗king.fight();//使用武器king.performWeapon();//改变武器(对象)king.setWeaponBehavior(new KnifeBehavior());//再次使用武器king.performWeapon();System.out.println("\n另一个角色");Character troll=new Troll();//Troll troll=new Troll();troll.fight();troll.performWeapon();troll.setWeaponBehavior(new SwordBehavior());troll.performWeapon();}}使用责任链模式计算阶乘，设计要求：a.设计一个类，该类使用int型数据计算阶乘。

b.设计一个类，该类使用long型数据计算阶乘。

c.设计一个类，该类使用BigInteger型数据计算阶乘。

使用责任链模式将上述对象组成一个责任链，要求责任链上对象的顺序是：首先使用int型数据计算阶乘，然后使用long型数据计算阶乘，最后使用BigInteger型数据计算阶乘。

用户可以使用责任链计算任意整数的阶乘，类图如下所示。

注意：不够写可写到背面并注明public interface Handler {public abstract void compuerMultiply(String number);public abstract void setNextHandler(Handler handler);}public class UseInt implements Handler{private Handler handler;private int result=1;public void compuerMultiply(String number) {try{int n=Integer.parseInt(number);int i=1;while(i<=n){result=result*i;if(result<=0){System.out.println("超出我的能力范围，我计算不了");puerMultiply(number);return;}i++;}System.out.println(number+"的阶乘:"+result);}catch(NumberFormatException exp){System.out.println(exp.toString());}}public void setNextHandler(Handler handler) {this.handler=handler;}}public class UseLong implements Handler{private Handler handler;private long result=1;public void compuerMultiply(String number) {try{long n=Long.parseLong(number);long i=1;while(i<=n){result=result*i;if(result<=0){System.out.println("超出我的能力范围，我计算不了");puerMultiply(number);return;}i++;}System.out.println(number+"的阶乘:"+result);}catch(NumberFormatException exp){System.out.println(exp.toString());}}public void setNextHandler(Handler handler) {this.handler=handler;}}import java.math.BigInteger;public class UseBigInteger implements Handler{private Handler handler;private BigInteger result=new BigInteger("1");public void compuerMultiply(String number) {try{BigInteger n=new BigInteger(number);BigInteger ONE=new BigInteger("1");BigInteger i=ONE;while(pareTo(n)<=0){result=result.multiply(i);i=i.add(ONE);}System.out.println(number+"的阶乘:"+result);}catch(NumberFormatException exp){System.out.println(exp.toString());}}public void setNextHandler(Handler handler) {this.handler=handler;}}public class Application {private Handler useInt,useLong,useBig;public void createChain(){useInt=new UseInt();useLong=new UseLong();useBig=new UseBigInteger();useInt.setNextHandler(useLong);useLong.setNextHandler(useBig);}public void reponseClient(String number){ puerMultiply(number);}public static void main(String args[]){Application application=new Application();application.createChain();application.reponseClient("32");}}。