JDK 5.0 and JDK 6.0 include the Java Monitoring & Management Console tool, also known as JConsole. Read about JConsole's usage options, and find out how JConsole changed from JDK 5 to JDK 6.

Every time you do so, Firefox inherits a new version of the Java Console (a debugging tool that’s useless to the vast majority of users). Unfortunately, the old ones don’t get deleted.

System.out.println ((char)27 + "[2J"); However, escape sequences are not very portable. For example, Windows NT provides an ANSI.SYS driver, but only for legacy DOS applications (which a JVM is not).