责任链模式
/**
* 价格处理人，负责处理客户折扣申请
*/
public abstract class PriceHandler {
protected PriceHandler successor;
public void setSuccessor(PriceHandler successor) {
this.successor = successor;
}
/**
* 处理折扣申请
*/
public abstract void processDiscount(
float discount);
/**
* 工厂方法创建对象
*/
public static PriceHandler
createPriceHandler() {
PriceHandler sales =
new Sales();
PriceHandler manager =
new Manager();
PriceHandler ceo =
new CEO();
sales.setSuccessor(manager);
manager.setSuccessor(ceo);
return sales;
}
}
/**
* 销售，可以批准5%以内的折扣
*/
public class Sales extends PriceHandler{
@Override
public void processDiscount(
float discount) {
if(discount <=
0.05){
System.out.format(
"销售批准了折扣: %.2f",discount);
}
else {
successor.processDiscount(discount);
}
}
}
/**
* 销售经理，可以批准30%以内的折扣
*/
public class Manager extends PriceHandler{
@Override
public void processDiscount(
float discount) {
if(discount <=
0.3){
System.out.format(
"销售经理批准了折扣: %.2f",discount);
}
else {
successor.processDiscount(discount);
}
}
}
/**
* CEO，可以批准5%以内的折扣
*/
public class CEO extends PriceHandler{
@Override
public void processDiscount(
float discount) {
if(discount <=
0.55){
System.out.format(
"CEO批准了折扣: %.2f",discount);
}
else {
System.out.format(
"CEO拒绝了折扣: %.2f",discount);
}
}
}
/**
* 客户，请求折扣
*/
public class Customer {
private PriceHandler priceHandler;
public void setPriceHandler(PriceHandler priceHandler) {
this.priceHandler = priceHandler;
}
/**
* 请求折扣
*/
public void requestDiscount(
float discount){
priceHandler.processDiscount(discount);
}
}
public static void main(String[] args) {
Customer customer =
new Customer();
customer.setPriceHandler(PriceHandler.createPriceHandler());
Random random =
new Random();
for (
int i =
0; i <
50; i++) {
customer.requestDiscount(random.nextFloat());
System.out.println(
"");
}
}
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