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♪ java.lang

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>>> dir(java.lang)
['AbstractMethodError', 'Appendable', 'ArithmeticException', 'ArrayIndexOutOfBoundsException', 'ArrayStoreException', 'AssertionError', 'Boolean', 'Byte', 'CharSequence', 'Character', 'Class', 'ClassCastException', 'ClassCircularityError', 'ClassFormatError', 'ClassLoader', 'ClassNotFoundException', 'CloneNotSupportedException', 'Cloneable', 'Comparable', 'Compiler', 'Deprecated', 'Double', 'Enum', 'EnumConstantNotPresentException', 'Error', 'Exception', 'ExceptionInInitializerError', 'Float', 'IllegalAccessError', 'IllegalAccessException', 'IllegalArgumentException', 'IllegalMonitorStateException', 'IllegalStateException', 'IllegalThreadStateException', 'IncompatibleClassChangeError', 'IndexOutOfBoundsException', 'InheritableThreadLocal', 'InstantiationError', 'InstantiationException', 'Integer', 'InternalError', 'InterruptedException', 'Iterable', 'LinkageError', 'Long', 'Math', 'NegativeArraySizeException', 'NoClassDefFoundError', 'NoSuchFieldError', 'NoSuchFieldException', 'NoSuchMethodError', 'NoSuchMethodException', 'NullPointerException', 'Number', 'NumberFormatException', 'Object', 'OutOfMemoryError', 'Override', 'Package', 'Process', 'ProcessBuilder', 'Readable', 'Runnable', 'Runtime', 'RuntimeException', 'RuntimePermission', 'SecurityException', 'SecurityManager', 'Short', 'StackOverflowError', 'StackTraceElement', 'StrictMath', 'String', 'StringBuffer', 'StringBuilder', 'StringIndexOutOfBoundsException', 'SuppressWarnings', 'System', 'Thread', 'ThreadDeath', 'ThreadGroup', 'ThreadLocal', 'Throwable', 'TypeNotPresentException', 'UnknownError', 'UnsatisfiedLinkError', 'UnsupportedClassVersionError', 'UnsupportedOperationException', 'VerifyError', 'VirtualMachineError', 'Void', '__name__', 'annotation', 'instrument', 'management', 'ref', 'reflect']