Update code

bennyhuo · bennyhuo · commit 9cc0bf83e6fd · 2016-11-20T13:29:05.000+08:00
diff --git a/README.md b/README.md
@@ -54,7 +54,7 @@
 ####[09 尾递归优化](http://v.qq.com/x/page/f0345wmuw2m.html)
 　　尾递归，顾名思义，就是递归中调用自身的部分在函数体的最后一句。我们知道，递归调用对于栈大小的考验是非常大的，也经常会因为这个导致 StackOverflow，所以尾递归优化也是大家比较关注的一个话题。Kotlin 支持语法层面的尾递归优化，这在其他语言里面是不多见的。
 
-####10 单例[预计 11.14 录制]
+####10 单例[11.20 上传中]
 
 　　单例大家一定都不陌生，只要你动手写一个程序，就免不了要设计出一些全局存在且唯一的对象，他们就适合采用单例模式编写。在 Java 里面，单例模式的写法常见的有好几种，虽然简单却也是涉及了一些有意思的话题，那么在 Kotlin 当中我们要怎么设计单例程序呢？
 
diff --git a/code/Kt10/src/main/java/net/println/kt10/java/PlainOldSingleton.java b/code/Kt10/src/main/java/net/println/kt10/java/PlainOldSingleton.java
@@ -6,7 +6,9 @@
 public class PlainOldSingleton {
     private static PlainOldSingleton INSTANCE = new PlainOldSingleton();
 
-    private PlainOldSingleton(){}
+    private PlainOldSingleton(){
+        System.out.println("PlainOldSingleton");
+    }
 
     public static PlainOldSingleton getInstance(){
         return INSTANCE;
diff --git a/code/Kt10/src/main/kotlin/net/println/kt10/kotlin/LazyNotThreadSafe.kt b/code/Kt10/src/main/kotlin/net/println/kt10/kotlin/LazyNotThreadSafe.kt
@@ -5,7 +5,7 @@ package net.println.kt10.kotlin
  */
 class LazyNotThreadSafe {
     companion object{
-        val instance = lazy {
+        val instance by lazy(LazyThreadSafetyMode.NONE) {
             LazyNotThreadSafe()
         }
 
diff --git a/code/Kt10/src/main/kotlin/net/println/kt10/kotlin/LazyThreadSafeDoubleCheck.kt b/code/Kt10/src/main/kotlin/net/println/kt10/kotlin/LazyThreadSafeDoubleCheck.kt
@@ -5,11 +5,11 @@ package net.println.kt10.kotlin
  */
 class LazyThreadSafeDoubleCheck private constructor(){
     companion object{
-        val instance = lazy(mode = LazyThreadSafetyMode.SYNCHRONIZED){
+        val instance by lazy(mode = LazyThreadSafetyMode.SYNCHRONIZED){
             LazyThreadSafeDoubleCheck()
         }
 
-        @Volatile var instance2: LazyThreadSafeDoubleCheck? = null
+        private @Volatile var instance2: LazyThreadSafeDoubleCheck? = null
 
         fun getInstance() = {
             if(instance2 == null){

Original file line number	Diff line number	Diff line change
`@@ -5,7 +5,7 @@ package net.println.kt10.kotlin`
`5`	`5`	`*/`
`6`	`6`	`class LazyNotThreadSafe {`
`7`	`7`	`companion object{`
`8`		`- val instance = lazy {`
	`8`	`+ val instance by lazy(LazyThreadSafetyMode.NONE) {`
`9`	`9`	`LazyNotThreadSafe()`
`10`	`10`	`}`
`11`	`11`