# Package org.apache.hadoop.util

Common utilities.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  IPList |
  Progressable | A facility for reporting progress.
  Tool | A tool interface that supports handling of generic command-line options.

- Class Summary
  Class | Description
  --- | ---
  ApplicationClassLoader | A `URLClassLoader` for application isolation.
  PureJavaCrc32 | A pure-java implementation of the CRC32 checksum that uses the same polynomial as the built-in native CRC32.
  PureJavaCrc32C | A pure-java implementation of the CRC32 checksum that uses the CRC32-C polynomial, the same polynomial used by iSCSI and implemented on many Intel chipsets supporting SSE4.2.
  ReflectionUtils | General reflection utils
  Shell | A base class for running a Shell command.
  ShutdownHookManager | The `ShutdownHookManager` enables running shutdownHook in a deterministic order, higher priority first.
  StringInterner | Provides string interning utility methods.
  SysInfo | Plugin to calculate resource information on the system.
  ToolRunner | A utility to help run `Tool`s.
  VersionInfo | This class returns build information about Hadoop components.

## Package org.apache.hadoop.util Description

Common utilities.

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