23种设计模式 软件设计

abstract class Approver { protected String name; protected Approver successor; public Approver(String name) { this.name=name; } public void SetSuccessor(Approver successor) { this.successor=successor; } public abstract void ProcessRequest(PurchaseRequest request); } class Director extends Approver { public Director(String name) { super(name); } public void ProcessRequest(PurchaseRequest request) { if(request.getAmount()<10000.0) { System.out.println("Director " + name + " handles the Request:" + request.getNumber() + ",amount is " + request.getAmount()); } else { if(successor!=null) successor.ProcessRequest(request); } } } class ViceCEO extends Approver { public ViceCEO(String name) { super(name); } public void ProcessRequest(PurchaseRequest request) { if(request.getAmount()<50000.0) { System.out.println("ViceCEO " + name + " handles the Request:" + request.getNumber() + ",amount is " + request.getAmount()); } else { if(successor!=null) successor.ProcessRequest(request); } } } class CEO extends Approver { public CEO(String name) { super(name); } public void ProcessRequest(PurchaseRequest request) { if(request.getAmount()<100000.0) { System.out.println("CEO " + name + " handles the Request:" + request.getNumber() + ",amount is " + request.getAmount()); } else { System.out.println("Need a meeting for Request:" + request.getNumber() + ",amount is " + request.getAmount()); } } } class PurchaseRequest { private int number; private double amount; private String purpose; public PurchaseRequest(int number,double amount,String purpose) { this.number=number; this.amount=amount; this.purpose=purpose; } public double getAmount() { return amount; } public void setAmount(double amount) { this.amount=amount; } public int getNumber() { return number; } public void setNumber(int number) { this.number=number; } public String getPurpose() { return purpose; } public void setPurpose(String purpose) { this.purpose=purpose; } } class Client { public static void main(String[] a) { Director zhangsan=new Director("zhangsan"); ViceCEO lisi=new ViceCEO("lisi"); CEO wangwu=new CEO("wangwu"); zhangsan.SetSuccessor(lisi); lisi.SetSuccessor(wangwu); PurchaseRequest pr1=new PurchaseRequest(1001,6000,"Project1"); zhangsan.ProcessRequest(pr1); PurchaseRequest pr2=new PurchaseRequest(1002,16000,"Project2"); zhangsan.ProcessRequest(pr2); PurchaseRequest pr3=new PurchaseRequest(1003,86000,"Project3"); zhangsan.ProcessRequest(pr3); PurchaseRequest pr4=new PurchaseRequest(1004,186000,"Project4"); zhangsan.ProcessRequest(pr4); } }