探索Java设计模式：责任链模式
// 定义抽象审批人接口，包含处理请求的方法
interface Approver {
void setNext(Approver approver);
void processRequest(Request request);
}
// 具体审批人角色实现
class Manager implements Approver {
private Approver nextApprover;
@Override
public void setNext(Approver approver) {
this.nextApprover = approver;
}
@Override
public void processRequest(Request request) {
if (request.getAmount() <= 5000) {
System.out.println("Manager approved request: " + request.getDescription());
} else if (nextApprover != null) {
nextApprover.processRequest(request);
} else {
System.out.println("No one can approve this request.");
}
}
}
class Director implements Approver {
private Approver nextApprover;
@Override
public void setNext(Approver approver) {
this.nextApprover = approver;
}
@Override
public void processRequest(Request request) {
if (request.getAmount() <= 10000) {
System.out.println("Director approved request: " + request.getDescription());
} else if (nextApprover != null) {
nextApprover.processRequest(request);
} else {
System.out.println("No one can approve this request.");
}
}
}
class President implements Approver {
private Approver nextApprover;
@Override
public void setNext(Approver approver) {
this.nextApprover = approver;
}
@Override
public void processRequest(Request request) {
if (request.getAmount() <= 20000) {
System.out.println("President approved request: " + request.getDescription());
} else {
System.out.println("Request exceeds the president's authority.");
}
}
}
// 请求类
class Request {
private String description;
private int amount;
public Request(String description, int amount) {
this.description = description;
this.amount = amount;
}
// ... getters and setters
}