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🎉 readme & singleton

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README.md
src/cn/ucaner/pattern/create/singleton
- Singleton.java

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`‎README.md‎`

Lines changed: 15 additions & 1 deletion

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`@@ -1,4 +1,18 @@`
`1`		`-![](http://upload-images.jianshu.io/upload_images/7802425-9eb1bcd006e34aa6.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)`
	`1`	`+<p align=center>`
	`2`	`+ <a href="https://github.com/Jasonandy/Java-Core-Advanced">`
	`3`	`+ <img src="http://upload-images.jianshu.io/upload_images/7802425-9eb1bcd006e34aa6.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="Java-Core-Advanced" >`
	`4`	`+ </a>`
	`5`	`+</p>`
	`6`	`+`
	`7`	`+<p align=center>`
	`8`	`+ You are what you want to be.`
	`9`	`+</p>`
	`10`	`+`
	`11`	`+<p align="center">`
	`12`	`+ <a href="#"><img src="https://img.shields.io/wercker/ci/wercker/docs.svg?style=for-the-badge" alt=""></a>`
	`13`	`+ <a href="#"><img src="https://img.shields.io/badge/Author-Jason-orange.svg?style=for-the-badge" alt=""></a>`
	`14`	`+</p>`
	`15`	`+`
`2`	`16`
`3`	`17`	`# Ucaner`
`4`	`18`	`> You are what you want to be. - w.b`

`‎src/cn/ucaner/pattern/create/singleton/Singleton.java‎`

Lines changed: 17 additions & 7 deletions

Original file line number	Diff line number	Diff line change
`@@ -23,19 +23,30 @@`
`23`	`23`	`*/`
`24`	`24`	`public class Singleton {`
`25`	`25`
`26`		`- //防止外部创建实例私有`
	`26`	`+ /**`
	`27`	`+ * 防止外部创建实例私有`
	`28`	`+ * Singleton.`
	`29`	`+ */`
`27`	`30`	`private Singleton() {`
`28`	`31`
`29`	`32`	`}`
`30`	`33`
`31`		`- //唯一实例`
	`34`	`+ /**`
	`35`	`+ * 唯一实例`
	`36`	`+ * 内存可见性:通俗来说就是,线程A对一个volatile变量的修改,对于其它线程来说是可见的,即线程每次获取volatile变量的值都是最新的。`
	`37`	`+ * https://www.cnblogs.com/chengxiao/p/6528109.html`
	`38`	`+ */`
`32`	`39`	`private static volatile Singleton mInstance;`
`33`	`40`
`34`	`41`	`public static Singleton getInstance() {`
`35`		`- //第一个锁,如果没有实例`
`36`		`- if (mInstance == null) {`
`37`		`- synchronized (Singleton.class) {`
`38`		`- //第二个锁,如果没有任何线程创建Singleton实例`
	`42`	`+`
	`43`	`+ if (mInstance == null) {//第一个锁,如果没有实例`
	`44`	`+`
	`45`	`+ /**`
	`46`	`+ * 第二个锁,如果没有任何线程创建Singleton实例对象锁 - 若多个线程拥有同一个MyObject类的对象,则这些方法只能以同步的方式执行`
	`47`	`+ * https://www.cnblogs.com/hapjin/p/5452663.html`
	`48`	`+ */`
	`49`	`+ synchronized (Singleton.class) {`
`39`	`50`	`if (mInstance == null) {`
`40`	`51`	`mInstance = new Singleton();`
`41`	`52`	`}`
`@@ -44,7 +55,6 @@ public static Singleton getInstance() {`
`44`	`55`	`return mInstance;`
`45`	`56`	`}`
`46`	`57`
`47`		`-`
`48`	`58`	`public static void main(String[] args) {`
`49`	`59`	`System.out.println(mInstance);`
`50`	`60`	`}`

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`‎README.md‎`

`‎src/cn/ucaner/pattern/create/singleton/Singleton.java‎`

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