现在列出计算机上的可用实例，并确认您的实例存在。
Now list the available instances on the machine and confirm your instance existence.
为了成功生成部署环境，您需要确保有数据库实例存在。
For the deployment environment generation to succeed, you need to make sure that the database instances exist.
此功能检查如果实例存在，如果是这样，它返回。
This function checks if the instance exists - if it does, it returns it.
单例模式是一种有用的控制类访问的途径，他能保证只有一个类实例存在。
Singletons are a useful way to control access to a class, making sure that only one instance can exist.
您还可以指定这些属性必须与另一个业务模型的实例存在一定的关系，比如负责这个硬件的所属公司。
You can also specify that there must be a relationship to an instance of another business model, perhaps the owning organization in charge of the hardware.
由于单例对象作为实例存在而不是类的静态成员，所以你能够惰性地初始化单例对象，即只需要在第一次用它的时候才去创建它。
With singletons implemented as single instances instead of static class members, you can initialize the singleton lazily, creating it only when it is first used.
也许更多类似的测试最终会给研究人员提供他们正在寻找的证据，并加强心灵感应存在的实例。
Perhaps more tests like these will eventually give the researchers the evidence they are seeking and strengthen the case for the existence of telepathy.
如果安装某个业务流程或人工任务的新版本，通常旧版本的实例仍然存在。
If you install a new version of a business process or human task, usually instances of the old version still exist.
当某个模板不再存在任何实例时，可以通过卸载对应的企业应用程序删除该模板。
When no instances exist anymore, you can remove a template by uninstalling the corresponding enterprise application.
这些特定程序的实例可以存在于给定进程的多个线程中。
Those instances of a particular program can exist in multiple threads within a given process.
泄漏单元：存在多个实例的数据结构内的对象。
Leaking unit: the object in the data structure where there are multiple instances present.
只要对业务逻辑的所有修改仍然在新实例中存在，就可以迁移实例。
Instances can be migrated, as long as all changes to the business logic are still in the future instance.
以上代码首先检查是否存在实例。
因此，结果仅返回第一个实例中的地址，因为第二个实例中不存在元素。
Therefore, the result returns only the addresses from the first instance because the element does not exist in the second instance.
类是一直存在的，而实例具有有限的生命周期。
The classes last forever, and the instances have a limited lifetime.
在ITDS 6.0以前的版本中，不存在目录实例。
There was no directory instance in prior versions of ITDS 6.0.
集群环境中单独的服务器实例作为集群成员而存在。
The individual server instances in a cluster environment are referred to as cluster members.
特别地，它存在类实例之间的交互作用。
Specifically, it presents interactions between class instances.
否则，将返回已存在的CommandFactory的实例。
Otherwise it will return the existing instance of CommandFactory.
对于可能存在多个MXBean实例的那些MXBean类型来说，存在着工厂方法，可以在List中返回MXBean，如清单2所示。
For those MXBean types where multiple instances of the MXBean may exist, there are factory methods that return the MXBeans in a List, as shown in Listing 2.
max_coordagents参数是可以存在于实例中的协调代理的最大数量。
The max_coordagents parameter is the maximum number of coordinating agents that can exist in the instance.
对于每个容器管理的em实例，都存在一个或多个对应的容器管理的持久性上下文(Persistence Contexts,PC)。
For each container-managed EM instance, there are one or more corresponding container-managed persistence contexts (PC).
这个实例中仍存在两个不足之处。
Here are two disadvantages that still remain in this example.
静态Current属性使用Stack.Peek方法返回位于堆栈顶端的T实例（如果存在），如果Stack 为空则返回空。
The static Current property uses the Stack.Peek method to return the T instance at the top of the stack if one exists, returning null if the Stack is empty.
利用db2ilist命令来确定实例是否存在于实例清单中。
Use the db2ilist command to determine if the instance still exists in the instance list.
第二，图2 中不存在现有的对象缓存实例。
Second, in Figure 2 there are no existing object cache instances.
单一实例指的是旨在让应用程序中一次只存在一个实例的类。
Singletons are classes that are designed to have only one instance existing at a time in an application.
虽然云计算相对年轻，但在市场上已经存在无数的云计算实例。
Although cloud computing is relatively young, there are already myriad cloud offerings on the market.
您的特定安装可能有也可能没有预先存在的缓存实例。
Your particular install may or may not have pre-existing cache instances.
您的特定安装可能有也可能没有预先存在的缓存实例。
Your particular install may or may not have pre-existing cache instances.
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