CODEWITHSUNDEEP
java
kamal
kamal

Reputation: 9785

Accessing UUID from another class in Java

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 ?

Here is a simplified version of my classes:

public class A {
    @Test
    public void aMethod() {     
        RandomStringUUID ruuid = new RandomStringUUID();
        }
}

Then:

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
        }
}

Upvotes: 2

Views: 11121

Answers (4)

Andreas Dolk
Andreas Dolk

Reputation: 114757

We sometimes test use helper classes. That could be a solution for your (test) case. So A wouldn't provide the value to B but both would obtain the same object from a third class:

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)

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.

Upvotes: 0

gtgaxiola
gtgaxiola

Reputation: 9331

Make your variable a public static variable in class A

public static RandomStringUUID RUUID = new RandomStringUUID();

After the beatdown I'm getting in the voting count

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

Upvotes: 2

CPerkins
CPerkins

Reputation: 9008

Either have A give the value to B 

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

Upvotes: 0

sics
sics

Reputation: 1318

use a static approach:

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

public class B { 
    @Test
    public void bMethod() {
         RandomStringUUID ruuid = A.getRuuid();
    }
}

Upvotes: 4

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