Class ExplicitInitializationCheck

  • All Implemented Interfaces:
    Configurable, Contextualizable

    public class ExplicitInitializationCheck
    extends AbstractCheck

    Checks if any class or object member explicitly initialized to default for its type value (null for object references, zero for numeric types and char and false for boolean.

    Rationale: each instance variable gets initialized twice, to the same value. Java initializes each instance variable to its default value (0 or null) before performing any initialization specified in the code. So in this case, x gets initialized to 0 twice, and bar gets initialized to null twice. So there is a minor inefficiency. This style of coding is a hold-over from C/C++ style coding, and it shows that the developer isn't really confident that Java really initializes instance variables to default values.

    • Field Detail

      • MSG_KEY

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

      • ExplicitInitializationCheck

        public ExplicitInitializationCheck()
    • Method Detail

      • getDefaultTokens

        public final 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:
        TokenTypes
      • getRequiredTokens

        public final 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:
        TokenTypes
      • getAcceptableTokens

        public final 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:
        TokenTypes
      • setOnlyObjectReferences

        public void setOnlyObjectReferences​(boolean onlyObjectReferences)
        Sets whether only explicit initialization made to null should be checked.
        Parameters:
        onlyObjectReferences - whether only explicit initialization made to null should be checked