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一.无状态
我们都知道只有多个线程访问公共资源的时候，才可能出现数据安全问题，那么如果我们没有公共资源，是不是就没有这个问题呢？
public class NoStatusService { public void add(String status) {
System.out.println("add status:" + status); } public void update(String status)
{ System.out.println("update status:" + status); }}
二.不可变
如果多个线程访问公共资源是不可变的，也不会出现数据的安全性问题。
public class NoChangeService { public static final String DEFAULT_NAME =
"abc"; public void add(String status) { System.out.println("add status:" +
status); }}
三.安全的发布
如果类中有公共资源，但是没有对外开放访问权限，即对外安全发布，也没有线程安全问题
public class SafePublishService { private String name; public String getName()
{ return name; } public void add(String status) {
