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Olá Christofer, em Java os métodos com retorno quando o resultado não possui valor será retornado o valor padrão da linguagem. Teste ir em sua IDE e criar uma classe abstrata, depois crie uma subclasse para importar os métodos dessa classe abstrata. Observe que os valores de retorno estarão no padrão do tipo de dado utilizado no método.
Espero ter ajudado.
from curso-java-basico.
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