diff --git a/src/com/msb/singleton/Singleton01.java b/src/com/msb/singleton/Singleton01.java
new file mode 100644
index 0000000..4ff0c8c
--- /dev/null
+++ b/src/com/msb/singleton/Singleton01.java
@@ -0,0 +1,30 @@
+package com.msb.singleton;
+
+/**
+ * @Author bingor
+ * @Date 2022-10-06 10:25
+ * @Description:
+ *    饿汉式
+ *    类加载到内存后，就实例化一个单例，JVM保证线程安全
+ *    简单实用，推荐使用！
+ *    唯一缺点：不管用到与否，类加载是就完成了实例化
+ *    （话说你不用的，你装载它干啥）
+ * @Version: 1.0
+ */
+public class Singleton01 {
+
+    private static final Singleton01 INSTANCE = new Singleton01();
+
+    private Singleton01() {}
+
+    public static Singleton01 getInstance() {
+        return INSTANCE;
+    }
+
+    public static void main(String[] args) {
+        Singleton01 singleton1 = Singleton01.getInstance();
+        Singleton01 singleton2 = Singleton01.getInstance();
+        System.out.println(singleton1 == singleton2);
+    }
+
+}
diff --git a/src/com/msb/singleton/Singleton02.java b/src/com/msb/singleton/Singleton02.java
new file mode 100644
index 0000000..711ed9e
--- /dev/null
+++ b/src/com/msb/singleton/Singleton02.java
@@ -0,0 +1,29 @@
+package com.msb.singleton;
+
+/**
+ * @Author bingor
+ * @Date 2022-10-06 10:25
+ * @Description: 跟01一样，只是使用了静态语句快
+ * @Version: 1.0
+ */
+public class Singleton02 {
+
+    private static final Singleton02 INSTANCE;
+
+    static {
+        INSTANCE = new Singleton02();
+    }
+
+    private Singleton02() {}
+
+    public static Singleton02 getInstance() {
+        return INSTANCE;
+    }
+
+    public static void main(String[] args) {
+        Singleton02 singleton1 = Singleton02.getInstance();
+        Singleton02 singleton2 = Singleton02.getInstance();
+        System.out.println(singleton1 == singleton2);
+    }
+
+}
diff --git a/src/com/msb/singleton/Singleton03.java b/src/com/msb/singleton/Singleton03.java
new file mode 100644
index 0000000..4272f05
--- /dev/null
+++ b/src/com/msb/singleton/Singleton03.java
@@ -0,0 +1,39 @@
+package com.msb.singleton;
+
+import java.util.Objects;
+
+/**
+ * @Author bingor
+ * @Date 2022-10-06 10:25
+ * @Description:
+ *      懒汉式：
+ *      虽然达到了按需初始化的目的，但却带来了线程不安全的问题
+ * @Version: 1.0
+ */
+public class Singleton03 {
+
+    private static Singleton03 INSTANCE;
+
+    private Singleton03() {}
+
+    public static Singleton03 getInstance() {
+        if(Objects.isNull(INSTANCE)) {
+            try {   //这里是为了测试线程
+                Thread.sleep(1);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            INSTANCE = new Singleton03();
+        }
+        return INSTANCE;
+    }
+
+    public static void main(String[] args) {
+        for (int i=0; i<100; i++) {
+            new Thread(() -> {  //同样的哈希码，可能是不同的对象。但不同的对象，有不同的哈希码
+                System.out.println(Singleton03.getInstance().hashCode());
+            }).start();
+        }
+    }
+
+}
diff --git a/src/com/msb/singleton/Singleton04.java b/src/com/msb/singleton/Singleton04.java
new file mode 100644
index 0000000..524466b
--- /dev/null
+++ b/src/com/msb/singleton/Singleton04.java
@@ -0,0 +1,40 @@
+package com.msb.singleton;
+
+import java.util.Objects;
+
+/**
+ * @Author bingor
+ * @Date 2022-10-06 10:25
+ * @Description:
+ *      懒汉式：
+ *      虽然达到了按需初始化的目的，但却带来了线程不安全的问题
+ *      可以通过synchronized解决，但也带来了效率下降
+ * @Version: 1.0
+ */
+public class Singleton04 {
+
+    private static Singleton04 INSTANCE;
+
+    private Singleton04() {}
+
+    public static synchronized Singleton04 getInstance() {
+        if(Objects.isNull(INSTANCE)) {
+            try {   //这里是为了测试线程
+                Thread.sleep(1);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            INSTANCE = new Singleton04();
+        }
+        return INSTANCE;
+    }
+
+    public static void main(String[] args) {
+        for (int i=0; i<100; i++) {
+            new Thread(() -> {  //同样的哈希码，可能是不同的对象。但不同的对象，有不同的哈希码
+                System.out.println(Singleton04.getInstance().hashCode());
+            }).start();
+        }
+    }
+
+}
diff --git a/src/com/msb/singleton/Singleton05.java b/src/com/msb/singleton/Singleton05.java
new file mode 100644
index 0000000..4008005
--- /dev/null
+++ b/src/com/msb/singleton/Singleton05.java
@@ -0,0 +1,43 @@
+package com.msb.singleton;
+
+import java.util.Objects;
+
+/**
+ * @Author bingor
+ * @Date 2022-10-06 10:25
+ * @Description:
+ *      懒汉式：
+ *      虽然达到了按需初始化的目的，但却带来了线程不安全的问题
+ *      可以通过synchronized解决，但也带来了效率下降
+ * @Version: 1.0
+ */
+public class Singleton05 {
+
+    private static Singleton05 INSTANCE;
+
+    private Singleton05() {}
+
+    public static Singleton05 getInstance() {
+        if(Objects.isNull(INSTANCE)) {
+            //试图减少同步代码块的方式来提高效率，然而不可行，仍然会有线程不安全问题
+            synchronized (Singleton05.class) {
+                try {   //这里是为了测试线程
+                    Thread.sleep(1);
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                }
+                INSTANCE = new Singleton05();
+            }
+        }
+        return INSTANCE;
+    }
+
+    public static void main(String[] args) {
+        for (int i=0; i<100; i++) {
+            new Thread(() -> {  //同样的哈希码，可能是不同的对象。但不同的对象，有不同的哈希码
+                System.out.println(Singleton05.getInstance().hashCode());
+            }).start();
+        }
+    }
+
+}
diff --git a/src/com/msb/singleton/Singleton06.java b/src/com/msb/singleton/Singleton06.java
new file mode 100644
index 0000000..878ef74
--- /dev/null
+++ b/src/com/msb/singleton/Singleton06.java
@@ -0,0 +1,45 @@
+package com.msb.singleton;
+
+import java.util.Objects;
+
+/**
+ * @Author bingor
+ * @Date 2022-10-06 10:25
+ * @Description:
+ *      懒汉式：
+ *      虽然达到了按需初始化的目的，但却带来了线程不安全的问题
+ *      可以通过synchronized解决，但也带来了效率下降
+ * @Version: 1.0
+ */
+public class Singleton06 {
+
+    private static Singleton06 INSTANCE;
+
+    private Singleton06() {}
+
+    public static Singleton06 getInstance() {
+        if(Objects.isNull(INSTANCE)) {
+            //试图减少同步代码块的方式来提高效率，然而不可行，仍然会有线程不安全问题
+            synchronized (Singleton06.class) {
+                if(Objects.isNull(INSTANCE)) {
+                    try {   //这里是为了测试线程
+                        Thread.sleep(1);
+                    } catch (InterruptedException e) {
+                        e.printStackTrace();
+                    }
+                    INSTANCE = new Singleton06();
+                }
+            }
+        }
+        return INSTANCE;
+    }
+
+    public static void main(String[] args) {
+        for (int i=0; i<100; i++) {
+            new Thread(() -> {  //同样的哈希码，可能是不同的对象。但不同的对象，有不同的哈希码
+                System.out.println(Singleton06.getInstance().hashCode());
+            }).start();
+        }
+    }
+
+}
diff --git a/src/com/msb/singleton/Singleton07.java b/src/com/msb/singleton/Singleton07.java
new file mode 100644
index 0000000..95efc70
--- /dev/null
+++ b/src/com/msb/singleton/Singleton07.java
@@ -0,0 +1,34 @@
+package com.msb.singleton;
+
+import java.util.Objects;
+
+/**
+ * @Author bingor
+ * @Date 2022-10-06 10:25
+ * @Description:
+ *      静态内部类方式
+ *      JVM保证单例
+ *      加载外部类时不会加载内部类，这样可以实现懒加载
+ * @Version: 1.0
+ */
+public class Singleton07 {
+
+    private Singleton07() {}
+
+    private static class Singleton07Holder {
+        private static final Singleton07 INSTANCE = new Singleton07();
+    }
+
+    public static Singleton07 getInstance() {
+        return Singleton07Holder.INSTANCE;
+    }
+
+    public static void main(String[] args) {
+        for (int i=0; i<100; i++) {
+            new Thread(() -> {  //同样的哈希码，可能是不同的对象。但不同的对象，有不同的哈希码
+                System.out.println(Singleton07.getInstance().hashCode());
+            }).start();
+        }
+    }
+
+}
diff --git a/src/com/msb/singleton/Singleton08.java b/src/com/msb/singleton/Singleton08.java
new file mode 100644
index 0000000..ecf0ea4
--- /dev/null
+++ b/src/com/msb/singleton/Singleton08.java
@@ -0,0 +1,19 @@
+package com.msb.singleton;
+
+/**
+ * @Author bingor
+ * @Date 2022-10-06 11:20
+ * @Description: 不仅可以解决线程同步，还可以防止反序列化
+ * @Version: 1.0
+ */
+public enum Singleton08 {
+    INSTANCE;
+
+    public static void main(String[] args) {
+        for (int i=0; i<100; i++) {
+            new Thread(() -> {  //同样的哈希码，可能是不同的对象。但不同的对象，有不同的哈希码
+                System.out.println(Singleton08.INSTANCE.hashCode());
+            }).start();
+        }
+    }
+}