从 Java 中的另一个类访问 UUID
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Accessing UUID from another class in Java
提问by kamal
Here is the scenario: I generate Random Data in one class and use it as an argument in a method in the same class. How can i use the exact same value in another class ?
这是场景：我在一个类中生成随机数据，并将其用作同一类中方法的参数。我如何在另一个类中使用完全相同的值？
Here is a simplified version of my classes:
这是我的课程的简化版本：
public class A {
@Test
public void aMethod() {
RandomStringUUID ruuid = new RandomStringUUID();
}
}
Then:
然后：
public class B {
@Test
public void bMethod() {
// Want to use ruuid , without instantiating RandomStringUUID
// as i dont want new values, i want the one from class A
}
}
采纳答案by gtgaxiola
Make your variable a public static variable in class A
使您的变量成为 A 类中的公共静态变量
public static RandomStringUUID RUUID = new RandomStringUUID();
After the beatdown I'm getting in the voting count
击败后我进入投票计数
private RandomStringUUID uuid;
private createUuid() {
uuid = new RandomStringUUID(); //Or any other way you create it
}
public static RandomStringUUID getRuuidForOtherClassesToCheck() {
return ruuid;
}
Not enough info on the OP's part to infer it's design rules or just a simple JAVA question on how to get a Variable from Class to Class. :D
OP 部分没有足够的信息来推断它的设计规则，或者只是一个关于如何从类到类获取变量的简单 JAVA 问题。:D
回答by sics
use a static approach:
使用静态方法：
public class A {
private final static RandomStringUUID ruuid = new RandomStringUUID();
public final static RandomStringUUID getRuuid() {
return ruuid;
}
@Test
public void aMethod() {
RandomStringUUID ruuid = getRuuid();
}
}
and
和
public class B {
@Test
public void bMethod() {
RandomStringUUID ruuid = A.getRuuid();
}
}
回答by CPerkins
Either have A give the value to B
要么让 A 给 B 赋值
public class B {
@Test
public void bMethod(RandomStringUUID ruuid) {
// Want to use ruuid , without instantiating RandomStringUUID
// as i dont want new values, i want the one from class A
}
}
Or have A make it available to be accessed by B, as @sics said
或者让 A 使其可供 B 访问，正如@sics 所说
回答by Andreas Dolk
We sometimes test use helper classes. That could be a solution for your (test) case. So Awouldn't provide the value to Bbut both would obtain the same object from a third class:
我们有时会测试使用辅助类。这可能是您的（测试）案例的解决方案。所以A不会提供值，B但两者都会从第三个类获得相同的对象：
public class TestHelper {
private final static RandomStringUUID UUID = new RandomStringUUID();
public static RandomStringUUID getDummyRandomStringUUID() {
return UUID;
}
}
public class A {
@Test
public void aMethod() {
RandomStringUUID ruuid = TestHelper.getDummyRandomStringUUID();
}
}
(and the same with B)
（与 相同B）
It's still questionable for testing, because each test run uses a different UUID value, so the tests are not reproduceable. It would be better to define a static UUID that is used for every test run.
对于测试来说仍然有问题，因为每次测试运行使用不同的 UUID 值，因此测试是不可复制的。最好定义一个用于每次测试运行的静态 UUID。
