java中新建线程访问主线程的的变量并修改，主线程中变量未改变？静态也不行最好能够详细解释内存状态

代码如下
package day15.thread;

public class RunnableAccess {
String name = null;

public RunnableAccess(String name) throws InterruptedException {
super();
this.name = name;
System.out.println(name);
init();
Thread.sleep(1880);
System.out.println(name);
}
public void init(){

new Thread(new Run(this)).start();
}
public static void main(String [] args) throws InterruptedException
{
new RunnableAccess("main");
}
}
class Run implements Runnable{
private RunnableAccess r = null;

public Run(RunnableAccess r){
this.r = r;
}
@Override
public void run() {
// TODO Auto-generated method stub
r.name = "run";
}

};

结果如下：
main
main

System.out.println(name);修改为
System.out.println(this.name); 你在百构造方法度中输出name，先是使用问本作用域的变量，再使用更大范围的答变量，直接就找到你构造方法中的name了，所以两次都是name