Can I create a common class, just for a single variable and extend it. Or initialize that variable in each class and use it?

Question

I have a common variable errorCollector, and the 2 below approaches works for me. But I cant figure out which is best or which is standard?

Approach 1 : Creating a common class for that variable then extending it.

class QAErrorCollector
{//This class is created only for this variable alone.
    @Rule
    public ErrorCollector errorCollector = new ErrorCollector();
}


class TestFeatureA extends QAErrorCollector
{

// use errorCollector
}

class TestFeatureB extends QAErrorCollector
{

// use errorCollector
}

Approach 2: Creating 2 different variables for each class. (This approach will work too in test case)

class TestFeatureA
    {
        @Rule
        public ErrorCollector errorCollector = new ErrorCollector();

        // use errorCollector
    }

    class TestFeatureB
    {
         @Rule
        public ErrorCollector errorCollector = new ErrorCollector();

        // use errorCollector
    }