GOF设计模式（06）职责链模式

//采购单&＃xff1a;请求类
class PurchaseRequest { private double amount; //采购金额 private int number; //采购单编号 private String purpose; //采购目的 public PurchaseRequest(double amount, int number, String purpose) { this.amount &＃61; amount; this.number &＃61; number; this.purpose &＃61; purpose; } public void setAmount(double amount) { this.amount &＃61; amount; } public double getAmount() { return this.amount; } public void setNumber(int number) { this.number &＃61; number; } public int getNumber() { return this.number; } public void setPurpose(String purpose) { this.purpose &＃61; purpose; } public String getPurpose() { return this.purpose; }
}

//审批者类&＃xff1a;抽象处理者
abstract class Approver { protected Approver successor; //定义后继对象 protected String name; //审批者姓名 public Approver(String name) { this.name &＃61; name; } //设置后继者 public void setSuccessor(Approver successor) { this.successor &＃61; successor; } //抽象请求处理方法 public abstract void processRequest(PurchaseRequest request);
} //主任类&＃xff1a;具体处理者
class Director extends Approver { public Director(String name) { super(name); } //具体请求处理方法 public void processRequest(PurchaseRequest request) { if (request.getAmount() <50000) { System.out.println("主任" &＃43; this.name &＃43; "审批采购单&＃xff1a;" &＃43; request.getNumber() &＃43; "&＃xff0c;金额&＃xff1a;" &＃43; request.getAmount() &＃43; "元&＃xff0c;采购目的&＃xff1a;" &＃43; request.getPurpose() &＃43; "。"); //处理请求
} else { this.successor.processRequest(request); //转发请求
} }
} //副董事长类&＃xff1a;具体处理者
class VicePresident extends Approver { public VicePresident(String name) { super(name); } //具体请求处理方法 public void processRequest(PurchaseRequest request) { if (request.getAmount() <100000) { System.out.println("副董事长" &＃43; this.name &＃43; "审批采购单&＃xff1a;" &＃43; request.getNumber() &＃43; "&＃xff0c;金额&＃xff1a;" &＃43; request.getAmount() &＃43; "元&＃xff0c;采购目的&＃xff1a;" &＃43; request.getPurpose() &＃43; "。"); //处理请求
} else { this.successor.processRequest(request); //转发请求
} }
} //董事长类&＃xff1a;具体处理者
class President extends Approver { public President(String name) { super(name); } //具体请求处理方法 public void processRequest(PurchaseRequest request) { if (request.getAmount() <500000) { System.out.println("董事长" &＃43; this.name &＃43; "审批采购单&＃xff1a;" &＃43; request.getNumber() &＃43; "&＃xff0c;金额&＃xff1a;" &＃43; request.getAmount() &＃43; "元&＃xff0c;采购目的&＃xff1a;" &＃43; request.getPurpose() &＃43; "。"); //处理请求
} else { this.successor.processRequest(request); //转发请求
} }
} //董事会类&＃xff1a;具体处理者
class Congress extends Approver { public Congress(String name) { super(name); } //具体请求处理方法 public void processRequest(PurchaseRequest request) { System.out.println("召开董事会审批采购单&＃xff1a;" &＃43; request.getNumber() &＃43; "&＃xff0c;金额&＃xff1a;" &＃43; request.getAmount() &＃43; "元&＃xff0c;采购目的&＃xff1a;" &＃43; request.getPurpose() &＃43; "。"); //处理请求
}
}

class Client { public static void main(String[] args) { Approver wjzhang,gyang,jguo,meeting; wjzhang &＃61; new Director("张无忌"); gyang &＃61; new VicePresident("杨过"); jguo &＃61; new President("郭靖"); meeting &＃61; new Congress("董事会"); //创建职责链
wjzhang.setSuccessor(gyang); gyang.setSuccessor(jguo); jguo.setSuccessor(meeting); //创建采购单 PurchaseRequest pr1 &＃61; new PurchaseRequest(45000,10001,"购买倚天剑"); wjzhang.processRequest(pr1); PurchaseRequest pr2 &＃61; new PurchaseRequest(60000,10002,"购买《葵花宝典》"); wjzhang.processRequest(pr2); PurchaseRequest pr3 &＃61; new PurchaseRequest(160000,10003,"购买《金刚经》"); wjzhang.processRequest(pr3); PurchaseRequest pr4 &＃61; new PurchaseRequest(800000,10004,"购买桃花岛"); wjzhang.processRequest(pr4); }
}