Implement methods in the DecoratorStream class:

  • write method should write the prefix into the underlying stream member only on the first write invocation. It should always write the bytes it receives to the underlying stream.
  • The prefix should be written in UTF-8 encoding.

For example, if the DecoratorStream is instantiated with "First line: " as the prefix parameter and write method is called with UTF-8 byte representation of "Hello, world!", it should write "First line: Hello, world!" into the underlying stream.

Java SE 8 
 

  •   Example case: java.lang.UnsupportedOperationException at DecoratorStream.write(DecoratorStream.java:33)
  •   DecoratorStream writes to the stream: java.lang.UnsupportedOperationException at DecoratorStream.write(DecoratorStream.java:33)
  •   DecoratorStream writes the prefix using UTF-8 encoding: java.lang.UnsupportedOperationException at DecoratorStream.write(DecoratorStream.java:33)
  •   Multiple writes: java.lang.UnsupportedOperationException at DecoratorStream.write(DecoratorStream.java:33)

Tags
Java Stream Public New
Hard

15min

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