夜光序言:
我们随时都可以撤。我们始终忠于自己的内心。尝试就是最好的结果。
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正文:
以道御术 / 以术识道
下面,我们看看状态模式
下面我们介绍职责链模式
package 责任链模式.采购审批;
public class PurchaseRequest {
private int type = 0; //夜光:请求的类型
private float price = 0.0f;
private int id = 0; //第几个请求
//下面,我们写一个构造器
public PurchaseRequest(int type, float price, int id) {
this.type = type;
this.price = price;
this.id = id;
}
public int getType() {
return type;
}
public float getPrice() {
return price;
}
public int getId() {
return id;
}
}
package 责任链模式.采购审批;
public class PurchaseRequest {
private int type = 0; //夜光:请求的类型
private float price = 0.0f; //夜光:请求的金额
private int id = 0; //第几个请求
//下面,我们写一个构造器
public PurchaseRequest(int type, float price, int id) {
this.type = type;
this.price = price;
this.id = id;
}
public int getType() {
return type;
}
public float getPrice() {
return price;
}
public int getId() {
return id;
}
}
package 责任链模式.采购审批;
//夜光
public class MasterApprover extends Approver{
public MasterApprover(String name) {
super(name); //调用父类的,把名字传进去就可以了
}
@Override
public void processRequest(PurchaseRequest purchaseRequest) {
if (purchaseRequest.getPrice() > 10000 && purchaseRequest.getPrice() <= 30000){
System.out.println("请求编号 id = " + purchaseRequest.getId()
+ "被" + this.name + "处理");
}else{
//让下一个来处理
approver.processRequest(purchaseRequest);
}
}
}
package 责任链模式.采购审批;
public class DepartmentApprover extends Approver{
public DepartmentApprover(String name) {
super(name); //调用父类的,把名字传进去就可以了
}
@Override
public void processRequest(PurchaseRequest purchaseRequest) {
if (purchaseRequest.getPrice() <= 5000){
System.out.println("请求编号 id = " + purchaseRequest.getId()
+ "被" + this.name + "处理");
}else{
//让下一个来处理
approver.processRequest(purchaseRequest); //到学院这个层面
}
}
}
package 责任链模式.采购审批;
public class CollegeApprover extends Approver{
public CollegeApprover(String name) {
super(name); //调用父类的,把名字传进去就可以了
}
@Override
public void processRequest(PurchaseRequest purchaseRequest) {
if (purchaseRequest.getPrice() > 5000 && purchaseRequest.getPrice() <= 10000){
System.out.println("请求编号 id = " + purchaseRequest.getId()
+ "被" + this.name + "处理");
}else{
//让下一个来处理
approver.processRequest(purchaseRequest); //下一个到校长层面
}
}
}
package 责任链模式.采购审批;
public abstract class Approver {
Approver approver; //下一个处理者
String name; //名字
//给一个构造器
public Approver(String name) { //至少要告诉我,你的名字
this.name = name;
}
//夜光:既然要告诉我下一个处理者,那么需要一个set方法
public void setApprover(Approver approver) {
this.approver = approver;
}
//处理审批请求的方法
//得到一个请求,处理是子类完成,因此该方法做成抽象的
public abstract void processRequest(PurchaseRequest purchaseRequest);
}