diff --git a/README.md b/README.md
index a592bde..a1304cc 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,6 @@
 <a href="//shang.qq.com/wpa/qunwpa?idkey=c1ffcc74ac64e98b1546b94537c581922548a7e63f78a86fcb59cef47988f453">
 <img src="https://img.shields.io/badge/QQ%E7%BE%A4-280891494-informational.svg" target="_blank" alt="酷玩Android你最牛" title="280891494"></a>
 </p>
-
 ----
 
 ## 介绍
@@ -58,7 +57,12 @@ Android只是太多太杂乱，很多人都不知道从何学起。也一些东
 
 :pencil: :one: **二维码处理（待完善）**
 
-> ### 4、开源库整理
+> ### 4、Java知识点解读
+
+**设计模式：** [Java23种设计模式](design_patterns)
+
+
+> ### 5、开源库整理
 
 :fire: :one: **[全面总结国内BATH等大厂开源的安卓有关的库](https://github.com/AweiLoveAndroid/CommonDevKnowledge/blob/master/%E5%9B%BD%E5%86%85BATH%E7%AD%89%E5%A4%A7%E5%8E%82%E5%BC%80%E6%BA%90%E7%9A%84%E5%AE%89%E5%8D%93%E6%9C%89%E5%85%B3%E7%9A%84%E5%BA%93/%E5%85%A8%E9%9D%A2%E6%80%BB%E7%BB%93%E5%9B%BD%E5%86%85BATH%E7%AD%89%E5%A4%A7%E5%8E%82%E5%BC%80%E6%BA%90%E7%9A%84%E5%AE%89%E5%8D%93%E6%9C%89%E5%85%B3%E7%9A%84%E5%BA%93.md)** 这一部分同步发布在我的简书博客，文章地址：[https://www.jianshu.com/p/2a6c806ba2fc](https://www.jianshu.com/p/2a6c806ba2fc)
 
diff --git a/design_patterns/README.md b/design_patterns/README.md
new file mode 100644
index 0000000..7ed8435
--- /dev/null
+++ b/design_patterns/README.md
@@ -0,0 +1,5 @@
+由光头强引发的Java23种设计模式的思考：
+
+代码|详细文章讲解
+----|----
+[](src/com/lzw/part1_creation_mode/builder)| [Java设计模式4之建造者模式（光头强买电锯引发的思考）](https://www.jianshu.com/p/713120e9dc59)
\ No newline at end of file
diff --git a/design_patterns/src/com/lzw/part1_creation_mode/README.md b/design_patterns/src/com/lzw/part1_creation_mode/README.md
new file mode 100644
index 0000000..d42bb9b
--- /dev/null
+++ b/design_patterns/src/com/lzw/part1_creation_mode/README.md
@@ -0,0 +1,7 @@
+结构型模式分为以下 5 种(有的版也把简单工厂模式算在里面，就是6种)：
+
+单例（Singleton）模式：某个类只能生成一个实例，该类提供了一个全局访问点供外部获取该实例，其拓展是有限多例模式。
+原型（Prototype）模式：将一个对象作为原型，通过对其进行复制而克隆出多个和原型类似的新实例。
+工厂方法（FactoryMethod）模式：定义一个用于创建产品的接口，由子类决定生产什么产品。
+抽象工厂（AbstractFactory）模式：提供一个创建产品族的接口，其每个子类可以生产一系列相关的产品。
+建造者（Builder）模式：将一个复杂对象分解成多个相对简单的部分，然后根据不同需要分别创建它们，最后构建成该复杂对象。
\ No newline at end of file
diff --git a/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/ChainsawBuilder.java b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/ChainsawBuilder.java
new file mode 100644
index 0000000..74133d1
--- /dev/null
+++ b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/ChainsawBuilder.java
@@ -0,0 +1,28 @@
+package com.lzw.part1_creation_mode.builder.chainsaw;
+
+/**
+ * 链锯建筑者
+ */
+public interface ChainsawBuilder {
+
+    // 蓄电池
+    void battery();
+    // 电动机
+    void motor();
+    // 减速箱
+    void reductionGearbox();
+    // 防护罩
+    void hood();
+    // 手柄
+    void handle();
+    // 开关
+    void switches();
+    // 插头
+    void plug();
+    // 圆锯片
+    void circularSaw();
+
+    // 获取链锯（产品）的实例
+    Chainsaws getChainsaws();
+
+}
diff --git a/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/ChainsawBuilderImpl.java b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/ChainsawBuilderImpl.java
new file mode 100644
index 0000000..cf7300a
--- /dev/null
+++ b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/ChainsawBuilderImpl.java
@@ -0,0 +1,59 @@
+package com.lzw.part1_creation_mode.builder.chainsaw;
+
+/**
+ * 链锯建筑者（具体建筑者）
+ */
+public class ChainsawBuilderImpl implements ChainsawBuilder{
+
+    private Chainsaws chainsaws;
+
+    public ChainsawBuilderImpl() {
+        chainsaws = new Chainsaws();
+    }
+
+
+    @Override
+    public void battery() {
+        chainsaws.setBattery("普通锂电池");
+    }
+
+    @Override
+    public void motor() {
+        chainsaws.setMotor("普通铝电动机");
+    }
+
+    @Override
+    public void reductionGearbox() {
+        chainsaws.setReductionGearbox("普通减速箱");
+    }
+
+    @Override
+    public void hood() {
+        chainsaws.setHood("普通PVC塑料");
+    }
+
+    @Override
+    public void handle() {
+        chainsaws.setHandle("普通PVC塑料");
+    }
+
+    @Override
+    public void switches() {
+        chainsaws.setSwitches("普通拉线开关");
+    }
+
+    @Override
+    public void plug() {
+        chainsaws.setPlug("普通三口插头");
+    }
+
+    @Override
+    public void circularSaw() {
+        chainsaws.setCircularSaw("普通钢锯片");
+    }
+
+    @Override
+    public Chainsaws getChainsaws() {
+        return chainsaws;
+    }
+}
diff --git a/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/ChainsawBuilderImpl2.java b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/ChainsawBuilderImpl2.java
new file mode 100644
index 0000000..44b638b
--- /dev/null
+++ b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/ChainsawBuilderImpl2.java
@@ -0,0 +1,59 @@
+package com.lzw.part1_creation_mode.builder.chainsaw;
+
+/**
+ * 链锯建筑者（具体建筑者）
+ */
+public class ChainsawBuilderImpl2 implements ChainsawBuilder{
+
+    private Chainsaws chainsaws;
+
+    public ChainsawBuilderImpl2() {
+        chainsaws = new Chainsaws();
+    }
+
+
+    @Override
+    public void battery() {
+        chainsaws.setBattery("环保大容量锂电池");
+    }
+
+    @Override
+    public void motor() {
+        chainsaws.setMotor("动力强耐高温散热好的纯铜电机");
+    }
+
+    @Override
+    public void reductionGearbox() {
+        chainsaws.setReductionGearbox("减震变频高功率变速箱");
+    }
+
+    @Override
+    public void hood() {
+        chainsaws.setHood("加厚加固耐磨抗打击防护罩");
+    }
+
+    @Override
+    public void handle() {
+        chainsaws.setHandle("人体工体学包胶手柄");
+    }
+
+    @Override
+    public void switches() {
+        chainsaws.setSwitches("调速防误触智能开关");
+    }
+
+    @Override
+    public void plug() {
+        chainsaws.setPlug("环保防触电插头");
+    }
+
+    @Override
+    public void circularSaw() {
+        chainsaws.setCircularSaw("高硬度锯片");
+    }
+
+    @Override
+    public Chainsaws getChainsaws() {
+        return chainsaws;
+    }
+}
diff --git a/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/Chainsaws.java b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/Chainsaws.java
new file mode 100644
index 0000000..71a4084
--- /dev/null
+++ b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/Chainsaws.java
@@ -0,0 +1,107 @@
+package com.lzw.part1_creation_mode.builder.chainsaw;
+
+/**
+ * 产品（链锯）
+ */
+public class Chainsaws {
+
+    // 蓄电池
+    private String battery;
+    // 电动机
+    private String motor;
+    // 减速箱
+    private String reductionGearbox;
+    // 防护罩
+    private String hood;
+    // 手柄
+    private String handle;
+    // 开关
+    private String switches;
+    // 插头
+    private String plug;
+    // 圆锯片
+    private String circularSaw;
+
+
+    public String getBattery() {
+        return battery;
+    }
+
+    public void setBattery(String battery) {
+        this.battery = battery;
+    }
+
+    public String getMotor() {
+        return motor;
+    }
+
+    public void setMotor(String motor) {
+        this.motor = motor;
+    }
+
+    public String getReductionGearbox() {
+        return reductionGearbox;
+    }
+
+    public void setReductionGearbox(String reductionGearbox) {
+        this.reductionGearbox = reductionGearbox;
+    }
+
+    public String getHood() {
+        return hood;
+    }
+
+    public void setHood(String hood) {
+        this.hood = hood;
+    }
+
+    public String getHandle() {
+        return handle;
+    }
+
+    public void setHandle(String handle) {
+        this.handle = handle;
+    }
+
+    public String getSwitches() {
+        return switches;
+    }
+
+    public void setSwitches(String switches) {
+        this.switches = switches;
+    }
+
+    public String getPlug() {
+        return plug;
+    }
+
+
+    public void setPlug(String plug) {
+        this.plug = plug;
+    }
+
+    public String getCircularSaw() {
+        return circularSaw;
+    }
+
+    public void setCircularSaw(String circularSaw) {
+        this.circularSaw = circularSaw;
+    }
+
+
+    @Override
+    public String toString() {
+        return "Chainsaws{" +
+                "\n battery='" + battery + '\'' +
+                ", motor='" + motor + '\'' +
+                ", reductionGearbox='" + reductionGearbox + '\'' +
+                ", hood='" + hood + '\'' +
+                ", handle='" + handle + '\'' +
+                ", switches='" + switches + '\'' +
+                ", plug='" + plug + '\'' +
+                ", circularSaw='" + circularSaw + '\'' +
+                "链锯已经做好了\n" + '}';
+    }
+
+
+}
diff --git a/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/HardwareStoreBoss.java b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/HardwareStoreBoss.java
new file mode 100644
index 0000000..e32d0a6
--- /dev/null
+++ b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/HardwareStoreBoss.java
@@ -0,0 +1,29 @@
+package com.lzw.part1_creation_mode.builder.chainsaw;
+
+/**
+ * 五金店老板（验收方）
+ */
+public class HardwareStoreBoss {
+
+    // 电话通知建造方，查看进度如何了
+    public Chainsaws notify(ChainsawBuilder builder){
+
+        // 蓄电池
+        builder.battery();
+        // 电动机
+        builder.motor();
+        // 减速箱
+        builder.reductionGearbox();
+        // 防护罩
+        builder.hood();
+        // 手柄
+        builder.handle();
+        // 开关
+        builder.switches();
+        // 插头
+        builder.plug();
+        // 圆锯片
+        builder.circularSaw();
+        return builder.getChainsaws();
+    }
+}
diff --git a/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/Test.java b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/Test.java
new file mode 100644
index 0000000..917d476
--- /dev/null
+++ b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw/Test.java
@@ -0,0 +1,21 @@
+package com.lzw.part1_creation_mode.builder.chainsaw;
+
+/**
+ * 测试类
+ */
+public class Test {
+
+    public static void main(String[] args) {
+
+        HardwareStoreBoss hardwareStoreBoss = new HardwareStoreBoss();
+
+        Chainsaws chainsaws = hardwareStoreBoss.notify(new ChainsawBuilderImpl());
+        System.out.println(chainsaws.toString());
+
+        // 新链锯
+        Chainsaws chainsaws2 = hardwareStoreBoss.notify(new ChainsawBuilderImpl2());
+        System.out.println(chainsaws2.toString());
+    }
+
+
+}
diff --git a/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw2/ChainsawBuilder.java b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw2/ChainsawBuilder.java
new file mode 100644
index 0000000..1a5ce98
--- /dev/null
+++ b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw2/ChainsawBuilder.java
@@ -0,0 +1,28 @@
+package com.lzw.part1_creation_mode.builder.chainsaw2;
+
+/**
+ * 链锯建筑者
+ */
+public interface ChainsawBuilder {
+
+    // 蓄电池
+    ChainsawBuilder battery(String name);
+    // 电动机
+    ChainsawBuilder motor(String name);
+    // 减速箱
+    ChainsawBuilder reductionGearbox(String name);
+    // 防护罩
+    ChainsawBuilder hood(String name);
+    // 手柄
+    ChainsawBuilder handle(String name);
+    // 开关
+    ChainsawBuilder switches(String name);
+    // 插头
+    ChainsawBuilder plug(String name);
+    // 圆锯片
+    ChainsawBuilder circularSaw(String name);
+
+    // 获取链锯（产品）的实例
+    Chainsaws getChainsaws();
+
+}
diff --git a/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw2/ChainsawBuilderImpl2.java b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw2/ChainsawBuilderImpl2.java
new file mode 100644
index 0000000..56e64a9
--- /dev/null
+++ b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw2/ChainsawBuilderImpl2.java
@@ -0,0 +1,66 @@
+package com.lzw.part1_creation_mode.builder.chainsaw2;
+
+/**
+ * 链锯建筑者（具体建筑者）
+ */
+public class ChainsawBuilderImpl2 implements ChainsawBuilder {
+
+    private Chainsaws chainsaws;
+
+    public ChainsawBuilderImpl2() {
+        chainsaws = new Chainsaws();
+    }
+
+    @Override
+    public ChainsawBuilder battery(String name) {
+        chainsaws.setBattery(name);
+        return this;
+    }
+
+    @Override
+    public ChainsawBuilder motor(String name) {
+        chainsaws.setMotor(name);
+        return this;
+    }
+
+    @Override
+    public ChainsawBuilder reductionGearbox(String name) {
+        chainsaws.setReductionGearbox(name);
+        return this;
+    }
+
+    @Override
+    public ChainsawBuilder hood(String name) {
+        chainsaws.setHood(name);
+        return this;
+    }
+
+    @Override
+    public ChainsawBuilder handle(String name) {
+        chainsaws.setHandle(name);
+        return this;
+    }
+
+    @Override
+    public ChainsawBuilder switches(String name) {
+        chainsaws.setSwitches(name);
+        return this;
+    }
+
+    @Override
+    public ChainsawBuilder plug(String name) {
+        chainsaws.setPlug(name);
+        return this;
+    }
+
+    @Override
+    public ChainsawBuilder circularSaw(String name) {
+        chainsaws.setCircularSaw(name);
+        return this;
+    }
+
+    @Override
+    public Chainsaws getChainsaws() {
+        return chainsaws;
+    }
+}
diff --git a/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw2/Chainsaws.java b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw2/Chainsaws.java
new file mode 100644
index 0000000..e800a69
--- /dev/null
+++ b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw2/Chainsaws.java
@@ -0,0 +1,108 @@
+package com.lzw.part1_creation_mode.builder.chainsaw2;
+
+/**
+ * 产品（链锯）
+ * 保持不变
+ */
+public class Chainsaws {
+
+    // 蓄电池
+    private String battery;
+    // 电动机
+    private String motor;
+    // 减速箱
+    private String reductionGearbox;
+    // 防护罩
+    private String hood;
+    // 手柄
+    private String handle;
+    // 开关
+    private String switches;
+    // 插头
+    private String plug;
+    // 圆锯片
+    private String circularSaw;
+
+
+    public String getBattery() {
+        return battery;
+    }
+
+    public void setBattery(String battery) {
+        this.battery = battery;
+    }
+
+    public String getMotor() {
+        return motor;
+    }
+
+    public void setMotor(String motor) {
+        this.motor = motor;
+    }
+
+    public String getReductionGearbox() {
+        return reductionGearbox;
+    }
+
+    public void setReductionGearbox(String reductionGearbox) {
+        this.reductionGearbox = reductionGearbox;
+    }
+
+    public String getHood() {
+        return hood;
+    }
+
+    public void setHood(String hood) {
+        this.hood = hood;
+    }
+
+    public String getHandle() {
+        return handle;
+    }
+
+    public void setHandle(String handle) {
+        this.handle = handle;
+    }
+
+    public String getSwitches() {
+        return switches;
+    }
+
+    public void setSwitches(String switches) {
+        this.switches = switches;
+    }
+
+    public String getPlug() {
+        return plug;
+    }
+
+
+    public void setPlug(String plug) {
+        this.plug = plug;
+    }
+
+    public String getCircularSaw() {
+        return circularSaw;
+    }
+
+    public void setCircularSaw(String circularSaw) {
+        this.circularSaw = circularSaw;
+    }
+
+
+    @Override
+    public String toString() {
+        return "Chainsaws{" +
+                "\n battery='" + battery + '\'' +
+                ", motor='" + motor + '\'' +
+                ", reductionGearbox='" + reductionGearbox + '\'' +
+                ", hood='" + hood + '\'' +
+                ", handle='" + handle + '\'' +
+                ", switches='" + switches + '\'' +
+                ", plug='" + plug + '\'' +
+                ", circularSaw='" + circularSaw + '\'' +
+                "链锯已经做好了\n" + '}';
+    }
+
+
+}
diff --git a/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw2/Test.java b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw2/Test.java
new file mode 100644
index 0000000..53bcf3d
--- /dev/null
+++ b/design_patterns/src/com/lzw/part1_creation_mode/builder/chainsaw2/Test.java
@@ -0,0 +1,24 @@
+package com.lzw.part1_creation_mode.builder.chainsaw2;
+
+/**
+ * 测试类
+ */
+public class Test {
+
+    public static void main(String[] args) {
+        ChainsawBuilderImpl2 chainsawBuilderImpl2 = new ChainsawBuilderImpl2();
+        Chainsaws chainsaws = chainsawBuilderImpl2.battery("环保大容量锂电池")
+                .motor("动力强耐高温散热好的纯铜电机")
+                .reductionGearbox("减震变频高功率变速箱")
+                .hood("加厚加固耐磨抗打击防护罩")
+                .handle("人体工体学包胶手柄")
+                .switches("调速防误触智能开关")
+                .plug("环保防触电插头")
+                .circularSaw("高硬度锯片")
+                .getChainsaws();
+
+        System.out.println(chainsaws.toString());
+    }
+
+
+}