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Showing content from https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/System.Logger.html below:

System.Logger (Java SE 21 & JDK 21)

Enclosing class:

System

public static interface System.Logger

Since:

9

See Also:

• System.getLogger(java.lang.String)
• System.getLogger(java.lang.String, java.util.ResourceBundle)
• System.LoggerFinder

• Nested Class Summary

  Nested Classes

• Method Summary

  Returns the name of this logger.

  boolean

  Checks if a message of the given level would be logged by this logger.

  default void

  Logs a message produced from the given object.

  default void

  default void

  Logs a message with an optional list of parameters.

  default void

  Logs a message associated with a given throwable.

  default void

  Logs a lazily supplied message.

  default void

  Logs a lazily supplied message associated with a given throwable.

  void

  Logs a message with resource bundle and an optional list of parameters.

  void

  Logs a localized message associated with a given throwable.

• Method Details
  • getName

    Returns the name of this logger.

    Returns:

    the logger name.

  • isLoggable

    Checks if a message of the given level would be logged by this logger.

    Parameters:

    level - the log message level.

    Returns:

    true if the given log message level is currently being logged.

    Throws:

    NullPointerException - if level is null.

  • log

    Logs a message.

    Implementation Requirements:

    The default implementation for this method calls this.log(level, (ResourceBundle)null, msg, (Object[])null);

    Parameters:

    level - the log message level.

    msg - the string message (or a key in the message catalog, if this logger is a localized logger); can be null.

    Throws:

    NullPointerException - if level is null.

  • log

    Logs a lazily supplied message. If the logger is currently enabled for the given log message level then a message is logged that is the result produced by the given supplier function. Otherwise, the supplier is not operated on.

    Implementation Requirements:

    When logging is enabled for the given level, the default implementation for this method calls this.log(level, (ResourceBundle)null, msgSupplier.get(), (Object[])null);

    Parameters:

    level - the log message level.

    msgSupplier - a supplier function that produces a message.

    Throws:

    NullPointerException - if level is null, or msgSupplier is null.

  • log

    Logs a message produced from the given object. If the logger is currently enabled for the given log message level then a message is logged that, by default, is the result produced from calling toString on the given object. Otherwise, the object is not operated on.

    Implementation Requirements:

    When logging is enabled for the given level, the default implementation for this method calls this.log(level, (ResourceBundle)null, obj.toString(), (Object[])null);

    Parameters:

    level - the log message level.

    obj - the object to log.

    Throws:

    NullPointerException - if level is null, or obj is null.

  • log

    Logs a message associated with a given throwable.

    Implementation Requirements:

    The default implementation for this method calls this.log(level, (ResourceBundle)null, msg, thrown);

    Parameters:

    level - the log message level.

    msg - the string message (or a key in the message catalog, if this logger is a localized logger); can be null.

    thrown - a Throwable associated with the log message; can be null.

    Throws:

    NullPointerException - if level is null.

  • log

    Logs a lazily supplied message associated with a given throwable. If the logger is currently enabled for the given log message level then a message is logged that is the result produced by the given supplier function. Otherwise, the supplier is not operated on.

    Implementation Requirements:

    When logging is enabled for the given level, the default implementation for this method calls this.log(level, (ResourceBundle)null, msgSupplier.get(), thrown);

    Parameters:

    level - one of the log message level identifiers.

    msgSupplier - a supplier function that produces a message.

    thrown - a Throwable associated with log message; can be null.

    Throws:

    NullPointerException - if level is null, or msgSupplier is null.

  • log

    Logs a message with an optional list of parameters.

    Implementation Requirements:

    The default implementation for this method calls this.log(level, (ResourceBundle)null, format, params);

    Parameters:

    level - one of the log message level identifiers.

    format - the string message format in MessageFormat format, (or a key in the message catalog, if this logger is a localized logger); can be null.

    params - an optional list of parameters to the message (may be none).

    Throws:

    NullPointerException - if level is null.

  • log

    Logs a localized message associated with a given throwable. If the given resource bundle is non-null, the msg string is localized using the given resource bundle. Otherwise the msg string is not localized.

    Parameters:

    level - the log message level.

    bundle - a resource bundle to localize msg; can be null.

    msg - the string message (or a key in the message catalog, if bundle is not null); can be null.

    thrown - a Throwable associated with the log message; can be null.

    Throws:

    NullPointerException - if level is null.

  • log

    Logs a message with resource bundle and an optional list of parameters. If the given resource bundle is non-null, the format string is localized using the given resource bundle. Otherwise the format string is not localized.

    Parameters:

    level - the log message level.

    bundle - a resource bundle to localize format; can be null.

    format - the string message format in MessageFormat format, (or a key in the message catalog if bundle is not null); can be null.

    params - an optional list of parameters to the message (may be none).

    Throws:

    NullPointerException - if level is null.

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