实现中介者模式示例，添加中介者、同事类及具体实现，增强代码可读性

go/mediator/main.go

@@ -0,0 +1,97 @@
+package main
+
+import (
+	"fmt"
+	"slices"
+)
+
+/*
+实例：
+汤宝宝一时想不开，当了房产中介。
+他负责把房东和租客撮合在一起，帮他们达成租房协议。
+*/
+
+// 抽象中介者
+type Mediator interface {
+	register(colleague Colleague)
+	Notify(sender Colleague, event string)
+}
+
+// 具体中介者 - 房产中介
+type HousingMediator struct {
+	colleagues []Colleague
+}
+
+func (m *HousingMediator) register(colleague Colleague) {
+	if slices.Contains(m.colleagues, colleague) {
+		return // 已注册
+	}
+	m.colleagues = append(m.colleagues, colleague)
+}
+
+func (m *HousingMediator) Notify(sender Colleague, event string) {
+	for _, colleague := range m.colleagues {
+		if colleague != sender {
+			colleague.Receive(event)
+		}
+	}
+}
+
+// 抽象同事类
+type Colleague interface {
+	Send(event string)
+	Receive(event string)
+}
+
+// 具体同事类 - 房东
+type Landlord struct {
+	mediator Mediator
+	name     string
+}
+
+func (l *Landlord) Send(event string) {
+	fmt.Printf("房东%s发布信息: %s\n", l.name, event)
+	l.mediator.Notify(l, event)
+}
+
+func (l *Landlord) Receive(event string) {
+	fmt.Printf("房东%s收到通知: %s\n", l.name, event)
+}
+
+// 具体同事类 - 租客
+type Tenant struct {
+	mediator Mediator
+	name     string
+}
+
+func (t *Tenant) Send(event string) {
+	fmt.Printf("租客%s发布需求: %s\n", t.name, event)
+	t.mediator.Notify(t, event)
+}
+
+func (t *Tenant) Receive(event string) {
+	fmt.Printf("租客%s收到通知: %s\n", t.name, event)
+}
+
+func main() {
+	fmt.Println("============= 中介者模式 =============")
+
+	mediator := &HousingMediator{}
+
+	landlord1 := &Landlord{mediator: mediator, name: "张三"}
+	landlord2 := &Landlord{mediator: mediator, name: "李四"}
+	tenant1 := &Tenant{mediator: mediator, name: "王五"}
+	tenant2 := &Tenant{mediator: mediator, name: "赵六"}
+
+	mediator.register(landlord1)
+	mediator.register(landlord2)
+	mediator.register(tenant1)
+	mediator.register(tenant2)
+
+	landlord1.Send("张三有一套两室一厅的房子出租，月租2000元。")
+	fmt.Println("-----")
+	tenant1.Send("王五需要一套三室的房子，预算3000元/月。")
+
+	fmt.Println()
+	fmt.Println("=========== 中介者模式结束 ===========")
+}