實(shí)例二：共享網(wǎng)絡(luò)設(shè)備（有外部狀態(tài)） 雖然網(wǎng)絡(luò)設(shè)備可以共享，但是分配給每一個(gè)終端計(jì)算機(jī)的端口(Port)是不同的，因此多臺(tái)計(jì)算機(jī)雖然可以共享同一個(gè)網(wǎng)絡(luò)設(shè)備，但必須使用不同的端口。我們可以將端口從網(wǎng)絡(luò)設(shè)備中抽取出來作為外部狀態(tài)，需要時(shí)再進(jìn)行設(shè)置。

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public class Switch implements NetworkDevice {private String type;public Switch(String type){this.type=type;}public String getType(){return this.type;} public void use(Port port){System.out.println("Linked by switch, type is " + this.type + ", port is " + port.getPort());} }

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public class Port {private String port;public Port(String port){this.port=port; }public void setPort(String port){this.port=port;}public String getPort(){return this.port;} }

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public interface NetworkDevice {public String getType();public void use(Port port); } public class Hub implements NetworkDevice {private String type;public Hub(String type){this.type=type;}public String getType(){return this.type;} public void use(Port port){System.out.println("Linked by Hub, type is " + this.type + ", port is " + port.getPort());} }

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import java.util.*;public class DeviceFactory {private ArrayList devices = new ArrayList();private int totalTerminal=0;public DeviceFactory(){NetworkDevice nd1=new Switch("Cisco-WS-C2950-24");devices.add(nd1);NetworkDevice nd2=new Hub("TP-LINK-HF8M");devices.add(nd2);}public NetworkDevice getNetworkDevice(String type){if(type.equalsIgnoreCase("cisco")){totalTerminal++;return (NetworkDevice)devices.get(0);}else if(type.equalsIgnoreCase("tp")){totalTerminal++;return (NetworkDevice)devices.get(1);}else{return null;}}public int getTotalDevice(){return devices.size();}public int getTotalTerminal(){return totalTerminal;} }

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public class Client {public static void main(String args[]){NetworkDevice nd1,nd2,nd3,nd4,nd5;DeviceFactory df=new DeviceFactory();nd1=df.getNetworkDevice("cisco");nd1.use(new Port("1000"));nd2=df.getNetworkDevice("cisco");nd2.use(new Port("1001"));nd3=df.getNetworkDevice("cisco");nd3.use(new Port("1002"));nd4=df.getNetworkDevice("tp");nd4.use(new Port("1003"));nd5=df.getNetworkDevice("tp");nd5.use(new Port("1004"));System.out.println("Total Device:" + df.getTotalDevice());System.out.println("Total Terminal:" + df.getTotalTerminal());} }

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