Class NoFinalizerCheck

All Implemented Interfaces:
Configurable, Contextualizable

public class NoFinalizerCheck extends AbstractCheck

Checks that there is no method finalize with zero parameters.

See Object.finalize()

Rationale: Finalizers are unpredictable, often dangerous, and generally unnecessary. Their use can cause erratic behavior, poor performance, and portability problems. For more information for the finalize method and its issues, see Effective Java: Programming Language Guide Third Edition by Joshua Bloch, §8.

To configure the check:

 <module name="NoFinalizer"/>
 

Example:

  public class Test {

      protected void finalize() throws Throwable { // violation
          try {
             System.out.println("overriding finalize()");
          } catch (Throwable t) {
             throw t;
          } finally {
             super.finalize();
          }
      }
  }
 

Parent is com.puppycrawl.tools.checkstyle.TreeWalker

Violation Message Keys:

  • avoid.finalizer.method
Since:
5.0
  • Field Details

    • MSG_KEY

      public static final String MSG_KEY
      A key is pointing to the warning message text in "messages.properties" file.
      See Also:
  • Constructor Details

    • NoFinalizerCheck

      public NoFinalizerCheck()
  • Method Details

    • getDefaultTokens

      public int[] getDefaultTokens()
      Description copied from class: AbstractCheck
      Returns the default token a check is interested in. Only used if the configuration for a check does not define the tokens.
      Specified by:
      getDefaultTokens in class AbstractCheck
      Returns:
      the default tokens
      See Also:
    • getAcceptableTokens

      public int[] getAcceptableTokens()
      Description copied from class: AbstractCheck
      The configurable token set. Used to protect Checks against malicious users who specify an unacceptable token set in the configuration file. The default implementation returns the check's default tokens.
      Specified by:
      getAcceptableTokens in class AbstractCheck
      Returns:
      the token set this check is designed for.
      See Also:
    • getRequiredTokens

      public int[] getRequiredTokens()
      Description copied from class: AbstractCheck
      The tokens that this check must be registered for.
      Specified by:
      getRequiredTokens in class AbstractCheck
      Returns:
      the token set this must be registered for.
      See Also:
    • visitToken

      public void visitToken(DetailAST ast)
      Description copied from class: AbstractCheck
      Called to process a token.
      Overrides:
      visitToken in class AbstractCheck
      Parameters:
      ast - the token to process