How to use temporary folder in Junit ( with example )

The TemporaryFolder Rule allows creation of files and folders that are guaranteed to be deleted when the test method finishes (whether it passes or fails). The TemporaryFolder is a test helper belongs to one of the Junit rules.
public static class HasTempFolder {
@Rule
public TemporaryFolder folder= new TemporaryFolder();

@Test
public void testUsingTempFolder() throws IOException {
File createdFile= folder.newFile("myfile.txt");
File createdFolder= folder.newFolder("subfolder");
assertTrue( createdFolder.exists() );
}
}

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