org.junit.runners

## Class JUnit4

- java.lang.Object
- - org.junit.runner.Runner
  - - org.junit.runners.ParentRunner<FrameworkMethod>
    - - org.junit.runners.BlockJUnit4ClassRunner
      - - org.junit.runners.JUnit4

- All Implemented Interfaces:
    Describable, Filterable, Sortable

      public final class JUnit4
      extends BlockJUnit4ClassRunner

  Aliases the current default JUnit 4 class runner, for future-proofing. If future versions of JUnit change the default Runner class, they will also change the definition of this class. Developers wanting to explicitly tag a class as a JUnit 4 class should use `@RunWith(JUnit4.class)`, not, for example in JUnit 4.5, `@RunWith(BlockJUnit4ClassRunner.class)`. This is the only way this class should be used--any extension that depends on the implementation details of this class is likely to break in future versions.
  Since:
    4.5

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `JUnit4(Class<?> klass)` Constructs a new instance of the default runner

  - ### Method Summary

    - ### Methods inherited from class org.junit.runners.BlockJUnit4ClassRunner

      `collectInitializationErrors, computeTestMethods, createTest, describeChild, getChildren, getTestRules, methodBlock, methodInvoker, possiblyExpectingExceptions, rules, runChild, testName, validateConstructor, validateFields, validateInstanceMethods, validateNoNonStaticInnerClass, validateOnlyOneConstructor, validateTestMethods, validateZeroArgConstructor, withAfters, withBefores, withPotentialTimeout`

    - ### Methods inherited from class org.junit.runners.ParentRunner

      `childrenInvoker, classBlock, classRules, filter, getDescription, getName, getRunnerAnnotations, getTestClass, run, runLeaf, setScheduler, sort, validatePublicVoidNoArgMethods, withAfterClasses, withBeforeClasses`

    - ### Methods inherited from class org.junit.runner.Runner

      `testCount`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### JUnit4

          public JUnit4(Class<?> klass)
                 throws InitializationError

      Constructs a new instance of the default runner
      Throws:
        `InitializationError`