package com.geekbang.learnvolatile;
public class AccessMemoryVolatile {
public volatile long counterV = 0;
public long counter = 0;
public static void main(String[] args) {
int loopCount = Integer.MAX_VALUE / 30;
// TODO 只是为了演示 volatile 每次访问都要直达内存，不能使用缓存，所以耗费的时间略多
AccessMemoryVolatile accessMemoryVolatile = new AccessMemoryVolatile();
Thread volatileAdder = new Thread(() -> {
long start = System.currentTimeMillis();
for (int i = 0; i < loopCount; i++) {
accessMemoryVolatile.counterV++;
}
System.out.println("volatile adder takes " + (System.currentTimeMillis() - start));
});
volatileAdder.start();
Thread justAdder = new Thread(() -> {
long start = System.currentTimeMillis();
for (int i = 0; i < loopCount; i++) {
accessMemoryVolatile.counter++;
}
System.out.println("simple adder takes " + (System.currentTimeMillis() - start));
});
justAdder.start();
}
}
java volatile 关键字实战.zip （10个子文件） 
12. volatile 关键字 code src com geekbang learnvolatile 
VolatileAppMain.java 497B AccessMemoryVolatile.java 1KB DataHolder.java 709B code.iml 423B .idea codeStyles codeStyleConfig.xml 149B uiDesigner.xml 9KB vcs.xml 247B workspace.xml 18KB misc.xml 275B modules.xml 248B资源评论
