go知识重新整理

Go/DesignPattern/buidler/buidler.go

@@ -0,0 +1,89 @@
+package buidler
+
+//builder模式适用的场景：无法或者不想一次性把实例的所有属性都给出，而是要分批次、分条件构造
+
+// 不是这样 a:=SomeStruct{1,2,"hello"}
+
+//而是这样
+/*
+a:=SomeStruct{}
+a.setAge(1)
+a.setMonth(2)
+if(situation){
+	a.setSomething("hello")
+}
+
+*/
+
+//builder模式除了上边的形式，还有一种变种，那就是链式(在每个函数最后返回实例自身)
+/*
+a:=SomeStruct{}
+a = a.setAge(1).setMonth(2).setSomething("hello")
+*/
+
+//生成器接口
+type Builder interface {
+	Part1()
+	Part2()
+	Part3()
+}
+
+//
+func NewDirector(builder Builder) *Director {
+	return &Director{
+		builder: builder,
+	}
+}
+
+type Director struct {
+	builder Builder
+}
+
+func (d *Director) Construct() {
+	d.builder.Part1()
+	d.builder.Part2()
+	d.builder.Part3()
+
+}
+
+//
+type Builder1 struct {
+	result string
+}
+
+func (b *Builder1) Part1() {
+	b.result += "1"
+}
+
+func (b *Builder1) Part2() {
+	b.result += "2"
+}
+
+func (b *Builder1) Part3() {
+	b.result += "3"
+}
+
+func (b *Builder1) GetResult() string {
+	return b.result
+}
+
+//
+type Builder2 struct {
+	result int
+}
+
+func (b *Builder2) Part1() {
+	b.result += 1
+}
+
+func (b *Builder2) Part2() {
+	b.result += 2
+}
+
+func (b *Builder2) Part3() {
+	b.result += 3
+}
+
+func (b *Builder2) GetResult() int {
+	return b.result
+}

Go/DesignPattern/buidler/buidler_test.go

@@ -0,0 +1,30 @@
+/**
+* @Author:zhoutao
+* @Date:2020/12/13 上午11:31
+* @Desc:
+ */
+
+package buidler
+
+import "testing"
+
+func TestBuilder1(t *testing.T) {
+	builder := &Builder1{}
+	director := NewDirector(builder)
+	director.Construct()
+	res := builder.GetResult()
+	if res != "123" {
+		t.Fatalf("Builder1 fail expect 123 ,return %s", res)
+	}
+
+}
+
+func TestBuilder2(t *testing.T) {
+	builder := &Builder2{}
+	director := NewDirector(builder)
+	director.Construct()
+	res := builder.GetResult()
+	if res != 6 {
+		t.Fatalf("Buidler2 fail expect 6,return %d", res)
+	}
+}