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java-multithread singleton包更新至example3,待续
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‎java-multithread/src/main/java/com/brianway/learning/java/multithread/singleton/example1/MyObject0.java

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package com.brianway.learning.java.multithread.singleton.example1;
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/**
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* Created by Brian on 2016/4/16.
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*/
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/**
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* 缺点：不能有其他实例变量
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* getInstance()方法没有同步，可能出现非线程安全问题
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*/
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public class MyObject0 {
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private static MyObject0 myObject = new MyObject0();
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private MyObject0(){}
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public static MyObject0 getInstance(){
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return myObject;
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}
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}

‎java-multithread/src/main/java/com/brianway/learning/java/multithread/singleton/example1/MyObject1.java

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package com.brianway.learning.java.multithread.singleton.example1;
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/**
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* Created by Brian on 2016/4/16.
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*/
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public class MyObject1 {
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private static MyObject1 myObject;
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private MyObject1(){}
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public static MyObject1 getInstance(){
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//延迟加载
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if(myObject == null){
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myObject = new MyObject1();
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}
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return myObject;
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}
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}

‎java-multithread/src/main/java/com/brianway/learning/java/multithread/singleton/example1/MyObject2.java

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package com.brianway.learning.java.multithread.singleton.example1;
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/**
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* Created by Brian on 2016/4/16.
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*/
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public class MyObject2 {
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private static MyObject2 myObject;
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private MyObject2(){}
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public static MyObject2 getInstance(){
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try {
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if(myObject == null){
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Thread.sleep(2000);//模拟创建对象前的坐一些准备
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myObject = new MyObject2();
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}
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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return myObject;
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}
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}

‎java-multithread/src/main/java/com/brianway/learning/java/multithread/singleton/example1/Run1_singleton0.java

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package com.brianway.learning.java.multithread.singleton.example1;
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/**
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* Created by Brian on 2016/4/16.
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*/
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/**
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* p262
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* 立即加载/“饿汉模式”
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*/
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public class Run1_singleton0 {
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public static void main(String[] args) {
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Thread0 t1 = new Thread0();
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Thread0 t2 = new Thread0();
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Thread0 t3 = new Thread0();
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t1.start();
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t2.start();
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t3.start();
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}
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}
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/*
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输出:
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663838472 com.brianway.learning.java.multithread.singleton.example1.MyObject0@27915f08
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663838472 com.brianway.learning.java.multithread.singleton.example1.MyObject0@27915f08
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663838472 com.brianway.learning.java.multithread.singleton.example1.MyObject0@27915f08
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*/

‎java-multithread/src/main/java/com/brianway/learning/java/multithread/singleton/example1/Run1_singleton1.java

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package com.brianway.learning.java.multithread.singleton.example1;
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/**
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* Created by Brian on 2016/4/16.
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*/
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/**
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* p264
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* 延迟加载/“懒汉模式”
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* 会出问题
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*
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*/
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public class Run1_singleton1 {
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public static void main(String[] args) {
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Thread1 t1 = new Thread1();
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Thread1 t2 = new Thread1();
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Thread1 t3 = new Thread1();
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t1.start();
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t2.start();
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t3.start();
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}
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}
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/*
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输出:
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541962297 com.brianway.learning.java.multithread.singleton.example1.MyObject1@3a1a7da6
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974814630 com.brianway.learning.java.multithread.singleton.example1.MyObject1@3a1a7da6
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974814630 com.brianway.learning.java.multithread.singleton.example1.MyObject1@3a1a7da6
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---------------------------
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974814630 com.brianway.learning.java.multithread.singleton.example1.MyObject1@3a1a7da6
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974814630 com.brianway.learning.java.multithread.singleton.example1.MyObject1@3a1a7da6
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974814630 com.brianway.learning.java.multithread.singleton.example1.MyObject1@3a1a7da6
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--------------------------
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1802892302 com.brianway.learning.java.multithread.singleton.example1.MyObject1@6b75f40e
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974814630 com.brianway.learning.java.multithread.singleton.example1.MyObject1@6b75f40e
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1771081048 com.brianway.learning.java.multithread.singleton.example1.MyObject1@6b75f40e
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*/

‎java-multithread/src/main/java/com/brianway/learning/java/multithread/singleton/example1/Run1_singleton2.java

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package com.brianway.learning.java.multithread.singleton.example1;
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/**
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* Created by Brian on 2016/4/16.
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*/
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/**
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* p265
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* 延迟加载/“懒汉模式”缺点展示
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*
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*/
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public class Run1_singleton2 {
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public static void main(String[] args) {
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Thread2 t1 = new Thread2();
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Thread2 t2 = new Thread2();
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Thread2 t3 = new Thread2();
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t1.start();
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t2.start();
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t3.start();
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}
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}
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/*
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输出:
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1771081048 com.brianway.learning.java.multithread.singleton.example1.MyObject2@6b75f40e
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1802892302 com.brianway.learning.java.multithread.singleton.example1.MyObject2@6b75f40e
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974814630 com.brianway.learning.java.multithread.singleton.example1.MyObject2@6b75f40e
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*/

‎java-multithread/src/main/java/com/brianway/learning/java/multithread/singleton/example1/Thread0.java

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package com.brianway.learning.java.multithread.singleton.example1;
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/**
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* Created by Brian on 2016/4/16.
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*/
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public class Thread0 extends Thread {
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@Override
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public void run() {
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System.out.println(MyObject0.getInstance().hashCode()+" "+MyObject0.getInstance());
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}
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}

‎java-multithread/src/main/java/com/brianway/learning/java/multithread/singleton/example1/Thread1.java

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package com.brianway.learning.java.multithread.singleton.example1;
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/**
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* Created by Brian on 2016/4/16.
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*/
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public class Thread1 extends Thread {
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@Override
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public void run() {
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System.out.println(MyObject1.getInstance().hashCode()+" "+MyObject1.getInstance());
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}
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}

‎java-multithread/src/main/java/com/brianway/learning/java/multithread/singleton/example1/Thread2.java

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package com.brianway.learning.java.multithread.singleton.example1;
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/**
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* Created by Brian on 2016/4/16.
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*/
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public class Thread2 extends Thread {
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@Override
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public void run() {
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System.out.println(MyObject2.getInstance().hashCode()+" "+MyObject2.getInstance());
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}
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}

‎java-multithread/src/main/java/com/brianway/learning/java/multithread/singleton/example2/MyObject1.java

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package com.brianway.learning.java.multithread.singleton.example2;
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/**
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* Created by Brian on 2016/4/16.
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*/
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public class MyObject1 {
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private static MyObject1 myObject;
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private MyObject1(){}
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synchronized public static MyObject1 getInstance(){
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try {
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if(myObject == null){
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Thread.sleep(3000);//模拟创建对象前的坐一些准备
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myObject = new MyObject1();
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}
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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return myObject;
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}
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}

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