Which statement is true about migration?

Question

Options

• AEvery module is moved to the module path in a top-down migration.
• BEvery module is moved to the module path in a bottom-up migration.
• CThe required modules migrate before the modules that depend on them in a top-down migration.
• DUnnamed modules are automatic modules in a top-down migration.

• A
  6% (1)
• B
  88% (14)
• C
  6% (1)

Explanation

Option B is correct because bottom-up migration works by converting libraries starting from those with no dependencies (the "bottom" of the dependency graph) and moving each one to the module path as a proper named module, continuing upward until the entire application is modularized - so every module ends up on the module path.

Option A is wrong because in top-down migration, unconverted JARs are placed on the module path as automatic modules rather than being fully migrated, so not every module is properly moved there.

Option C is wrong because it describes bottom-up behavior, not top-down. Top-down migration starts at the application level (the top) and works downward - dependencies migrate after the modules that depend on them.

Option D is wrong because unnamed modules and automatic modules are distinct concepts: unnamed modules live on the classpath, while automatic modules are unconverted JARs placed on the module path. Top-down migration uses automatic modules, not unnamed ones.

Memory tip: Think "Bottom-Up = Build Up the module path" - you're building a complete, fully modularized module path from the ground level, so everything ends up there. Top-down is the opposite: you start at the app and leave stragglers as automatic modules.

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