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java interview questions and answers

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3
Which of the statements is/are true? 
  1. Mutable classes are thread-safe
    
  2. Immutable classes are thread-safe
  3. Concrete classes are thread-safe
  4. Abstract classes are thread-safe
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5
Boxing means
  1. Conversion of primitive datatypes to objects
  2. Conversion of objects to primitive datatypes
  3. Fitting a large value in small datatype
  4. Java's way to fight bugs
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