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## org.optaplanner.core.impl.solution
Interface ProblemIO

All Known Implementing Classes:
  MachineReassignmentProblemIO, XStreamProblemIO

    public interface ProblemIO

Reads or writes a `Solution` from or to a `File`.

Every implementation must be thread-safe.

Method Summary
`String` | `getFileExtension()` Every `Solution` type potentially has its own file extension.
`Solution` | `read(File inputSolutionFile)` This method is thread-safe.
`void` | `write(Solution solution, File outputSolutionFile)` This method is thread-safe.

Method Detail

### getFileExtension

    String getFileExtension()

  Every `Solution` type potentially has its own file extension. If no specific file extension is defined by the use case, the following are recommended:
  - If this `ProblemIO` implementation serializes to XML, use file extension "xml".
  - If this `ProblemIO` implementation serializes to text, use file extension "txt".
  - If this `ProblemIO` implementation serializes to binary, use file extension "dat".

  It's good practice that both the input and the output file have the same file extension, because an output file should be able to function as an input file. If that isn't the case, this method should return the output file extension.

  The file extension does not include the dot that separates it from the base name.

  This method is thread-safe.

  Returns:
    never null, for example "xml"

### read

    Solution read(File inputSolutionFile)

  This method is thread-safe.

  Parameters:
    `inputSolutionFile` - never null
  Returns:
    never null

### write

    void write(Solution solution,
               File outputSolutionFile)

  This method is thread-safe.

  Parameters:
    `solution` - never null
    `outputSolutionFile` - never null, parent directory already exists

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