实验15：职责链模式
本次实验属于模仿型实验，通过本次实验学生将掌握以下内容：
1、理解职责链模式的动机，掌握该模式的结构；
2、能够利用职责链模式解决实际问题。
[实验任务一]：财务审批
某物资管理系统中物资采购需要分级审批，主任可以审批1万元及以下的采购单，部门经理可以审批5万元及以下的采购单，副总经理可以审批10万元及以下的采购单，总经理可以审批20万元及以下的采购单，20万元以上的采购单需要开职工大会确定。现用职责链模式设计该系统。
实验要求：
- 提交类图；
- 提交源代码；
- 注意编程规范。
`package rjsj.no15;
public abstract class Leader {
protected String name;
//上级领导
protected Leader successor;public Leader(String name) {this.name = name;
}public void setSuccessor(Leader successor) {this.successor = successor;
}protected abstract void handleRequest(ShoppingRequest request);
}`
`package rjsj.no15;
public class ShoppingRequest {
private String shoppingReason;
private double billMoney;
public ShoppingRequest(String shoppingReason,double billMoney){this.shoppingReason = shoppingReason;this.billMoney = billMoney;
}public String getShoppingReason() {return shoppingReason;
}public void setShoppingReason(String shoppingReason) {this.shoppingReason = shoppingReason;
}public double getBillMoney() {return billMoney;
}public void setBillMoney(double billMoney) {this.billMoney = billMoney;
}
}`
`package rjsj.no15;
public class Client {
public static void main(String[] args) {
Leader objDirector,objDepartmentManager,objViceManager,objGeneralManager;
objDirector = new Director("张主任");
objDepartmentManager = new DepartmentManager("刘部门经理");
objViceManager = new ViceManager("王副经理");
objGeneralManager = new GeneralManager("赵经理");
//设置上级objDirector.setSuccessor(objDepartmentManager);objDepartmentManager.setSuccessor(objViceManager);objViceManager.setSuccessor(objGeneralManager);ShoppingRequest shoppingRequest1 = new ShoppingRequest("买打印纸",1000);ShoppingRequest shoppingRequest2 = new ShoppingRequest("购置电脑",20000);ShoppingRequest shoppingRequest3 = new ShoppingRequest("购置空调",80000);ShoppingRequest shoppingRequest4 = new ShoppingRequest("办公室装修",160000);ShoppingRequest shoppingRequest5 = new ShoppingRequest("收购XX公司",1000000);objDirector.handleRequest(shoppingRequest1);System.out.println("****************************************");objDirector.handleRequest(shoppingRequest2);System.out.println("****************************************");objDirector.handleRequest(shoppingRequest3);System.out.println("****************************************");objDirector.handleRequest(shoppingRequest4);System.out.println("****************************************");objDirector.handleRequest(shoppingRequest5);System.out.println("****************************************");
}
}`
`package rjsj.no15;
//主任
class Director extends Leader{
public Director(String name) {
super(name);
}
public void handleRequest(ShoppingRequest request){if (request.getBillMoney()<10000.00){System.out.println(name + "主任处理物资采购" + request.getShoppingReason() + "采购资金为" + request.getBillMoney() + "元");} else {if (this.successor != null){this.successor.handleRequest(request);}}
}
}
//部门经理
class DepartmentManager extends Leader{
public DepartmentManager(String name) {
super(name);
}
protected void handleRequest(ShoppingRequest request) {if (request.getBillMoney()<50000.00){System.out.println(name + "部门经理处理物资采购" + request.getShoppingReason() + "采购资金为" + request.getBillMoney() + "元");} else {if (this.successor != null){this.successor.handleRequest(request);}}
}
}
//副经理
class ViceManager extends Leader{
public ViceManager(String name) {
super(name);
}
@Override
protected void handleRequest(ShoppingRequest request) {if (request.getBillMoney()<100000.00){System.out.println(name + "副经理处理物资采购" + request.getShoppingReason() + "采购资金为" + request.getBillMoney() + "元");} else {if (this.successor != null){this.successor.handleRequest(request);}}
}
}
//总经理
class GeneralManager extends Leader{
public GeneralManager(String name) {
super(name);
}
@Override
protected void handleRequest(ShoppingRequest request) {if (request.getBillMoney()<200000.00){System.out.println(name + "总经理处理物资采购" + request.getShoppingReason() + "采购资金为" + request.getBillMoney() + "元");} else {System.out.println("董事会将开会处理物资采购" + request.getShoppingReason() + "采购资金为" + request.getBillMoney() + "元");}
}
}`
实验16：命令模式
本次实验属于模仿型实验，通过本次实验学生将掌握以下内容：
1、理解命令模式的动机，掌握该模式的结构；
2、能够利用命令模式解决实际问题。
[实验任务一]：多次撤销和重复的命令模式
某系统需要提供一个命令集合（注：可以使用链表，栈等集合对象实现），用于存储一系列命令对象，并通过该命令集合实现多次undo()和redo()操作，可以使用加法运算来模拟实现。
实验要求：
- 提交类图；
- 提交源代码；
- 注意编程规范。
`package rjsj.no16;
abstract class AbstractCommand{//抽象命令
public abstract int execute(int value);
public abstract int undo();
public abstract int redo();
}
class ConcreteCommand extends AbstractCommand{//具体命令
private Adder adder = new Adder();
private int value;
public int execute(int value) {this.value=value;return adder.add(value);
}public int undo() {return adder.add(-value);
}public int redo() {return adder.add(+value);
}
}
class CalculatorForm {//调用者
private AbstractCommand command;
public void setCommand(AbstractCommand command) {this.command=command;
}//业务方法，用于调用命令类的方法
public void compute(int value) {int i = command.execute(value);System.out.println("执行运算，运算结果为：" + i);
}public void undo() {int i = command.undo();System.out.println("执行撤销，运算结果为：" + i);
}public void redo() {int i = command.redo();System.out.println("执行重复，运算结果为：" + i);
}
}
class Adder {//接收者
private int num=0;
public int add(int value) {num+=value;return num;
}
}
class Client {//客户类
public static void main(String args[]) {
CalculatorForm form = new CalculatorForm();
ConcreteCommand command = new ConcreteCommand();
form.setCommand(command);
form.compute(10);form.redo();form.compute(5);form.compute(10);form.undo();}
}`