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author
‘mxg133’
committed
2020-8-8
1 parent a4a6d1f commit 2cfeabf

72 files changed

Lines changed: 3623 additions & 50 deletions

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‎DesignPattern/src/_3singleton/Test.java‎

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package _3singleton;
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/**
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* @author 孟享广
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* @date 2020-08-08 12:19 下午
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* @description
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*/
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public class Test {
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public static void main(String[] args) {
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Runtime runtime = Runtime.getRuntime();
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System.out.println(runtime);
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}
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}

‎DesignPattern/src/_3singleton/type1/my/SingletonTest01.java‎

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package _3singleton.my;
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package _3singleton.type1.my;
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/**
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* @author 孟享广
@@ -7,8 +7,8 @@
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*/
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public class SingletonTest01 {
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public static void main(String[] args) {
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_3singleton.type2.my.singleton instance = _3singleton.type2.my.singleton.getInstance();
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_3singleton.type2.my.singleton singleton2 = _3singleton.type2.my.singleton.getInstance();
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singleton instance = singleton.getInstance();
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singleton singleton2 = singleton.getInstance();
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System.out.println(instance.equals(singleton2));
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}
@@ -17,9 +17,9 @@ public static void main(String[] args) {
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class singleton{
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private singleton() {
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}
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private final static _3singleton.type2.my.singleton instance = new _3singleton.type2.my.singleton();
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private final static singleton instance = new singleton();
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public static _3singleton.type2.my.singleton getInstance(){
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public static singleton getInstance(){
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return instance;
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}
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}

‎DesignPattern/src/_3singleton/type3/SingletonTest03.java‎

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@@ -1,10 +1,10 @@
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package com.atguigu.singleton.type3;
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package _3singleton.type3;
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public class SingletonTest03 {
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public static void main(String[] args) {
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System.out.println("懒汉式1 ， 线程不安全~");
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System.out.println("懒汉式1 ， 线程不安全~");
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Singleton instance = Singleton.getInstance();
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Singleton instance2 = Singleton.getInstance();
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System.out.println(instance == instance2); // true
@@ -16,11 +16,11 @@ public static void main(String[] args) {
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class Singleton {
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private static Singleton instance;
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private Singleton() {}
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//提供一个静态的公有方法，当使用到该方法时，才去创建 instance
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//即懒汉式
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//提供一个静态的公有方法，当使用到该方法时，才去创建 instance
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//即懒汉式
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public static Singleton getInstance() {
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if(instance == null) {
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instance = new Singleton();

‎DesignPattern/src/_3singleton/type3/my/SingletonTest03.java‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,29 @@
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package _3singleton.type3.my;
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/**
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* @author 孟享广
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* @date 2020-08-08 10:56 上午
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* @description
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*/
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public class SingletonTest03 {
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public static void main(String[] args) {
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singleton instance = singleton.getInstance();
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}
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}
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class singleton{
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private static singleton instance;
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private singleton() {
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}
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public static singleton getInstance(){
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if (instance == null){
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instance = new singleton();
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}
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return instance;
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}
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}

‎DesignPattern/src/_3singleton/type4/SingletonTest04.java‎

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package com.atguigu.singleton.type4;
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package _3singleton.type4;
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public class SingletonTest04 {
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public static void main(String[] args) {
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System.out.println("懒汉式2 ， 线程安全~");
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System.out.println("懒汉式2 ， 线程安全~");
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Singleton instance = Singleton.getInstance();
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Singleton instance2 = Singleton.getInstance();
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System.out.println(instance == instance2); // true
@@ -14,14 +13,14 @@ public static void main(String[] args) {
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}
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17-
// 懒汉式(线程安全，同步方法)
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// 懒汉式(线程安全，同步方法)
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class Singleton {
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private static Singleton instance;
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private Singleton() {}
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//提供一个静态的公有方法，加入同步处理的代码，解决线程安全问题
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//即懒汉式
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//提供一个静态的公有方法，加入同步处理的代码，解决线程安全问题
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//即懒汉式
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public static synchronized Singleton getInstance() {
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if(instance == null) {
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instance = new Singleton();

‎DesignPattern/src/_3singleton/type6/SingletonTest06.java‎

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Original file line numberDiff line numberDiff line change
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package com.atguigu.singleton.type6;
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package _3singleton.type6;
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public class SingletonTest06 {
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public static void main(String[] args) {
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System.out.println("双重检查");
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System.out.println("双重检查");
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Singleton instance = Singleton.getInstance();
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Singleton instance2 = Singleton.getInstance();
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System.out.println(instance == instance2); // true
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System.out.println("instance.hashCode=" + instance.hashCode());
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System.out.println("instance2.hashCode=" + instance2.hashCode());
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}
15-
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}
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// 懒汉式(线程安全，同步方法)
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// 懒汉式(线程安全，同步方法)
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class Singleton {
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private static volatile Singleton instance;
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private Singleton() {}
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//提供一个静态的公有方法，加入双重检查代码，解决线程安全问题, 同时解决懒加载问题
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//同时保证了效率, 推荐使用
26-
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//提供一个静态的公有方法，加入双重检查代码，解决线程安全问题, 同时解决懒加载问题
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//同时保证了效率, 推荐使用
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2724
public static synchronized Singleton getInstance() {
2825
if(instance == null) {
2926
synchronized (Singleton.class) {
3027
if(instance == null) {
3128
instance = new Singleton();
3229
}
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}
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}
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return instance;
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}

‎DesignPattern/src/_3singleton/type7/SingletonTest07.java‎

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package com.atguigu.singleton.type7;
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package _3singleton.type7;
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public class SingletonTest07 {
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public static void main(String[] args) {
7-
System.out.println("使用静态内部类完成单例模式");
6+
System.out.println("使用静态内部类完成单例模式");
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Singleton instance = Singleton.getInstance();
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Singleton instance2 = Singleton.getInstance();
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System.out.println(instance == instance2); // true
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System.out.println("instance.hashCode=" + instance.hashCode());
1211
System.out.println("instance2.hashCode=" + instance2.hashCode());
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12+
1413
}
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1615
}
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18-
// 静态内部类完成， 推荐使用
17+
// 静态内部类完成， 推荐使用
1918
class Singleton {
2019
private static volatile Singleton instance;
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22-
//构造器私有化
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//构造器私有化
2322
private Singleton() {}
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//写一个静态内部类,该类中有一个静态属性 Singleton
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//写一个静态内部类,该类中有一个静态属性 Singleton
2625
private static class SingletonInstance {
27-
private static final Singleton INSTANCE = new Singleton();
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private static final Singleton INSTANCE = new Singleton();
2827
}
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30-
//提供一个静态的公有方法，直接返回SingletonInstance.INSTANCE
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29+
//提供一个静态的公有方法，直接返回SingletonInstance.INSTANCE
30+
3231
public static synchronized Singleton getInstance() {
33-
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3433
return SingletonInstance.INSTANCE;
3534
}
3635
}

DesignPattern/src/_3singleton/type8/SingletonTest08.java renamed to DesignPattern/src/_3singleton/type8_Enum/SingletonTest08.java

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package com.atguigu.singleton.type8;
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package _3singleton.type8_Enum;
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public class SingletonTest08 {
44
public static void main(String[] args) {
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Singleton instance = Singleton.INSTANCE;
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Singleton instance2 = Singleton.INSTANCE;
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System.out.println(instance == instance2);
8-
8+
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System.out.println(instance.hashCode());
1010
System.out.println(instance2.hashCode());
11-
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1212
instance.sayOK();
1313
}
1414
}
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16-
//使用枚举，可以实现单例, 推荐
16+
//使用枚举，可以实现单例, 推荐
1717
enum Singleton {
18-
INSTANCE; //属性
18+
INSTANCE; //属性
1919
public void sayOK() {
2020
System.out.println("ok~");
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}

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