Better observe Java running

When compiling Java programs and running Java programs, you can add a command to better understand the Java program's package import and code parsing operations !!!!

The following describes how the helloworld program works:

Public class helloworld
{
Public static void main (string [] ARGs)
{
Print print = new print ("Hello World ");
System. Out. println (print );
}
}
Class print
{
Private string STR;
Public print (string str1)
{
STR = str1;
}
Public String tostring ()
{
Return STR;
}
}

In the next compilation, add-verbose: javac-verbose helloworld. Java to view the console output:

Then run it with Java-verbose; output:

[Loaded java. lang. Comparable from shared objects file]
[Loaded java. lang. CharSequence from shared objects file]
[Loaded java. lang. String from shared objects file]
[Loaded java. lang. reflect. GenericDeclaration from shared objects file]
[Loaded java. lang. reflect. Type from shared objects file]
[Loaded java. lang. reflect. AnnotatedElement from shared objects file]
[Loaded java. lang. Class from shared objects file]
[Loaded java. lang. Cloneable from shared objects file]
[Loaded java. lang. ClassLoader from shared objects file]
[Loaded java. lang. System from shared objects file]
[Loaded java. lang. Throwable from shared objects file]
[Loaded java. lang. Error from shared objects file]
[Loaded java. lang. ThreadDeath from shared objects file]
[Loaded java. Lang. Exception from shared objects file]
[Loaded java. Lang. runtimeexception from shared objects file]
[Loaded java. Security. protectiondomain from shared objects file]
[Loaded java. Security. accesscontrolcontext from shared objects file]
[Loaded java. Lang. classnotfoundexception from shared objects file]
[Loaded java. Lang. linkageerror from shared objects file]
[Loaded java. Lang. noclassdeffounderror from shared objects file]
[Loaded java. Lang. classcastexception from shared objects file]
[Loaded java. Lang. arraystoreexception from shared objects file]
[Loaded java. Lang. virtualmachineerror from shared objects file]
[Loaded java. Lang. outofmemoryerror from shared objects file]
[Loaded java. Lang. stackoverflowerror from shared objects file]
[Loaded java. lang. ref. Reference from shared objects file]
[Loaded java. lang. ref. SoftReference from shared objects file]
[Loaded java. lang. ref. WeakReference from shared objects file]
[Loaded java. lang. ref. FinalReference from shared objects file]
[Loaded java. lang. ref. PhantomReference from shared objects file]
[Loaded java. lang. ref. Finalizer from shared objects file]
[Loaded java. lang. Runnable from shared objects file]
[Loaded java. lang. Thread from shared objects file]
[Loaded java. lang. Thread $ UncaughtExceptionHandler from shared objects fi
[Loaded java. lang. ThreadGroup from shared objects file]
[Loaded java. util. Dictionary from shared objects file]
[Loaded java. util. Map from shared objects file]
[Loaded java. util. Hashtable from shared objects file]
[Loaded java. util. properties from shared objects file]
[Loaded java. Lang. Reflect. accessibleobject from shared objects file]
[Loaded java. Lang. Reflect. Member from shared objects file]
[Loaded java. Lang. Reflect. Field from shared objects file]
[Loaded java. Lang. Reflect. method from shared objects file]
[Loaded java. Lang. Reflect. constructor from shared objects file]
[Loaded sun. Reflect. magicaccessorimpl from shared objects file]
[Loaded sun. Reflect. methodaccessor from shared objects file]
[Loaded sun. Reflect. methodaccessorimpl from shared objects file]
[Loaded sun. Reflect. constructoraccessor from shared objects file]
[Loaded sun. Reflect. constructjavascessorimpl from shared objects file]
[Loaded sun. Reflect. delegatingclassloader from shared objects file]
[Loaded sun. reflect. ConstantPool from shared objects file]
[Loaded java. lang. Iterable from shared objects file]
[Loaded java. util. Collection from shared objects file]
[Loaded java. util. AbstractCollection from shared objects file]
[Loaded java. util. List from shared objects file]
[Loaded java. util. AbstractList from shared objects file]
[Loaded java. util. RandomAccess from shared objects file]
[Loaded java. util. Vector from shared objects file]
[Loaded java. lang. Appendable from shared objects file]
[Loaded java. lang. AbstractStringBuilder from shared objects file]
[Loaded java. lang. StringBuffer from shared objects file]
[Loaded java. lang. StackTraceElement from shared objects file]
[Loaded java. nio. Buffer from shared objects file]
[Loaded sun. Misc. atomiclong from shared objects file]
[Loaded sun. Misc. atomiclongcsimpl from shared objects file]
[Loaded java. Lang. boolean from shared objects file]
[Loaded java. Lang. character from shared objects file]
[Loaded java. Lang. Number from shared objects file]
[Loaded java. Lang. Float from shared objects file]
[Loaded java. Lang. Double from shared objects file]
[Loaded java. Lang. byte from shared objects file]
[Loaded java. Lang. Short from shared objects file]
[Loaded java. Lang. Integer from shared objects file]
[Loaded java. Lang. Long from shared objects file]
[Loaded java. Lang. Management. memoryusage from shared objects file]
[Loaded java. Lang. strictmath from shared objects file]
[Loaded java. Io. objectstreamfield from shared objects file]
[Loaded java. util. Comparator from shared objects file]
[Loaded java. lang. String $ CaseInsensitiveComparator from shared objects f
[Loaded java. security. Guard from shared objects file]
[Loaded java. security. Permission from shared objects file]
[Loaded java. security. BasicPermission from shared objects file]
[Loaded java. lang. RuntimePermission from shared objects file]
[Loaded java. util. AbstractMap from shared objects file]
[Loaded sun. misc. SoftCache from shared objects file]
[Loaded java. lang. ref. ReferenceQueue from shared objects file]
[Loaded java. lang. ref. ReferenceQueue $ Null from shared objects file]
[Loaded java. lang. ref. ReferenceQueue $ Lock from shared objects file]
[Loaded java. util. HashMap from shared objects file]
[Loaded java. io. ObjectStreamClass from shared objects file]
[Loaded java. security. PrivilegedAction from shared objects file]
[Loaded sun. reflect. ReflectionFactory $ GetReflectionFactoryAction from sh
Ects file]
[Loaded java. security. AccessController from shared objects file]
[Loaded java. util. Stack from shared objects file]
[Loaded sun. reflect. ReflectionFactory from shared objects file]
[Loaded java. util. Map $ Entry from shared objects file]
[Loaded java. util. HashMap $ Entry from shared objects file]
[Loaded java. lang. IncompatibleClassChangeError from shared objects file]
[Loaded java. lang. NoSuchMethodError from shared objects file]
[Loaded java. lang. annotation. Annotation from shared objects file]
[Loaded java. lang. reflect. ReflectPermission from shared objects file]
[Loaded java. lang. ref. Reference $ Lock from shared objects file]
[Loaded java. lang. ref. Reference $ ReferenceHandler from shared objects fil
[Loaded java. lang. ref. Finalizer $ FinalizerThread from shared objects file
[Loaded java. util. Enumeration from shared objects file]
[Loaded java. util. Hashtable $ EmptyEnumerator from shared objects file]
[Loaded java. util. Iterator from shared objects file]
[Loaded java. util. Hashtable $ EmptyIterator from shared objects file]
[Loaded java. util. Hashtable $ Entry from shared objects file]
[Loaded java. nio. charset. Charset from shared objects file]
[Loaded java. nio. charset. spi. CharsetProvider from shared objects file]
[Loaded sun. nio. cs. FastCharsetProvider from shared objects file]
[Loaded sun. nio. cs. StandardCharsets from shared objects file]
[Loaded sun. util. PreHashedMap from shared objects file]
[Loaded sun. nio. cs. StandardCharsets $ Aliases from shared objects file]
[Loaded sun. nio. cs. StandardCharsets $ Classes from shared objects file]
[Loaded sun. nio. cs. StandardCharsets $ Cache from shared objects file]
[Loaded java. lang. ThreadLocal from shared objects file]
[Loaded java. nio. charset. Charset $3 from C:/Program Files/Java/jre1.5.0/l
R]
[Loaded sun. reflect. Reflection from shared objects file]
[Loaded java. util. Collections from shared objects file]
[Loaded java. util. Random from shared objects file]
[Loaded java. util. concurrent. atomic. AtomicLong from shared objects file]
[Loaded sun. misc. Unsafe from shared objects file]
[Loaded java. lang. Class $3 from shared objects file]
[Loaded java. lang. reflect. Modifier from shared objects file]
[Loaded sun. reflect. LangReflectAccess from shared objects file]
[Loaded java. lang. reflect. ReflectAccess from shared objects file]
[Loaded java. util. Set from shared objects file]
[Loaded java. util. AbstractSet from shared objects file]
[Loaded java. util. Collections $ EmptySet from shared objects file]
[Loaded java. util. Collections $ EmptyList from shared objects file]
[Loaded java. util. Collections $ EmptyMap from shared objects file]
[Loaded java. util. Collections $ ReverseComparator from shared objects file
[Loaded java. util. Collections $ SynchronizedMap from shared objects file]
[Loaded sun. nio. cs. AbstractCharsetProvider from C:/Program Files/Java/jr
Ib/rt. jar]
[Loaded sun. nio. cs. ext. ExtendedCharsets from C:/Program Files/Java/jre1.
Charsets. jar]
[Loaded java. lang. Class $1 from shared objects file]
[Loaded sun. reflect. ReflectionFactory $1 from shared objects file]
[Loaded sun. reflect. nativeconstructextends cessorimpl from shared objects fi
[Loaded sun. reflect. delegatingconstructextends cessorimpl from shared object
[Loaded java. util. SortedMap from shared objects file]
[Loaded java. util. TreeMap from shared objects file]
[Loaded sun. misc. ASCIICaseInsensitiveComparator from shared objects file
[Loaded java. util. TreeMap $ Entry from shared objects file]
[Loaded sun. misc. VM from shared objects file]
[Loaded java. lang. StringBuilder from shared objects file]
[Loaded sun. nio. cs. ext. GBK from C:/Program Files/Java/jre1.5.0/lib/chars

[Loaded java. lang. StringCoding from shared objects file]
[Loaded java. lang. ThreadLocal $ ThreadLocalMap from shared objects file]
[Loaded java. lang. ThreadLocal $ ThreadLocalMap $ Entry from shared objects f
[Loaded java. lang. StringCoding $ StringDecoder from shared objects file]
[Loaded java. lang. StringCoding $ CharsetSD from shared objects file]
[Loaded java. nio. charset. CharsetDecoder from shared objects file]
[Loaded sun. nio. cs. ext. DoubleByteDecoder from C:/Program Files/Java/jre1
/Charsets. jar]
[Loaded sun. nio. cs. ext. GBK $ Decoder from C:/Program Files/Java/jre1.5.0/l
Ets. jar]
[Loaded java. nio. charset. CodingErrorAction from shared objects file]
[Loaded java. nio. ByteBuffer from shared objects file]
[Loaded java. nio. HeapByteBuffer from shared objects file]
[Loaded java. nio. Bits from shared objects file]
[Loaded java. nio. ByteOrder from shared objects file]
[Loaded java. lang. Readable from shared objects file]
[Loaded java. nio. CharBuffer from shared objects file]
[Loaded java. nio. HeapCharBuffer from shared objects file]
[Loaded java. nio. charset. CoderResult from shared objects file]
[Loaded java. nio. charset. CoderResult $ Cache from shared objects file]
[Loaded java. nio. charset. CoderResult $1 from shared objects file]
[Loaded java. nio. charset. CoderResult $2 from shared objects file]
[Loaded sun. misc. Version from shared objects file]
[Loaded java. io. Closeable from shared objects file]
[Loaded java. io. InputStream from shared objects file]
[Loaded java. io. FileInputStream from shared objects file]
[Loaded java. io. FileDescriptor from shared objects file]
[Loaded java. io. Flushable from shared objects file]
[Loaded java. io. OutputStream from shared objects file]
[Loaded java. io. FileOutputStream from shared objects file]
[Loaded java. io. FilterInputStream from shared objects file]
[Loaded java. io. BufferedInputStream from shared objects file]
[Loaded java. util. concurrent. atomic. AtomicReferenceFieldUpdater from sha
Cts file]
[Loaded java. util. concurrent. atomic. AtomicReferenceFieldUpdater $ AtomicRe
IeldUpdaterImpl from shared objects file]
[Loaded java. io. FilterOutputStream from shared objects file]
[Loaded java. io. PrintStream from shared objects file]
[Loaded java. io. BufferedOutputStream from shared objects file]
[Loaded java. io. Writer from shared objects file]
[Loaded java. io. OutputStreamWriter from shared objects file]
[Loaded sun. nio. cs. StreamEncoder from shared objects file]
[Loaded sun. io. Converters from shared objects file]
[Loaded sun. security. action. GetPropertyAction from shared objects file]
[Loaded sun. nio. cs. StreamEncoder $ CharsetSE from shared objects file]
[Loaded java. nio. charset. CharsetEncoder from shared objects file]
[Loaded sun. nio. cs. ext. DoubleByteEncoder from C:/Program Files/Java/jre1
/Charsets. jar]
[Loaded sun. nio. cs. ext. GBK $ Encoder from C:/Program Files/Java/jre1.5.0/l
Ets. jar]
[Loaded sun. nio. cs. Surrogate $ Parser from shared objects file]
[Loaded sun. nio. cs. Surrogate from shared objects file]
[Loaded java. io. BufferedWriter from shared objects file]
[Loaded java. lang. Runtime from shared objects file]
[Loaded java. io. File from shared objects file]
[Loaded java. io. FileSystem from shared objects file]
[Loaded java. io. Win32FileSystem from shared objects file]
[Loaded java. io. WinNTFileSystem from shared objects file]
[Loaded java. io. ExpiringCache from shared objects file]
[Loaded java. util. javashashmap from shared objects file]
[Loaded java. io. ExpiringCache $1 from shared objects file]
[Loaded java. util. javashashmap $ Entry from shared objects file]
[Loaded java. lang. ClassLoader $3 from shared objects file]
[Loaded java. io. ExpiringCache $ Entry from shared objects file]
[Loaded java. lang. ClassLoader $ NativeLibrary from shared objects file]
[Loaded java. Lang. stringcoding $ stringencoder from shared objects file]
[Loaded java. Lang. stringcoding $ charsetse from shared objects file]
[Loaded java. Lang. Terminator from shared objects file]
[Loaded sun. Misc. signalhandler from shared objects file]
[Loaded java. Lang. Terminator $1 from shared objects file]
[Loaded sun. Misc. signal from shared objects file]
[Loaded sun. Misc. nativesignalhandler from shared objects file]
[Loaded sun. Misc. javalangaccess from shared objects file]
[Loaded java. Lang. System $2 from shared objects file]
[Loaded sun. Misc. sharedsecrets from shared objects file]
[Loaded java. Lang. nullpointerexception from shared objects file]
[Loaded java. Lang. arithmeticexception from shared objects file]
[Loaded java. Lang. compiler from shared objects file]
[Loaded java. lang. Compiler $1 from shared objects file]
[Loaded sun. misc. Launcher from shared objects file]
[Loaded java.net. URLStreamHandlerFactory from shared objects file]
[Loaded sun. misc. Launcher $ Factory from shared objects file]
[Loaded java. security. SecureClassLoader from shared objects file]
[Loaded java.net. URLClassLoader from shared objects file]
[Loaded sun. misc. Launcher $ ExtClassLoader from shared objects file]
[Loaded sun. security. util. Debug from shared objects file]
[Loaded java. util. StringTokenizer from shared objects file]
[Loaded java. security. PrivilegedExceptionAction from shared objects file
[Loaded sun. misc. Launcher $ ExtClassLoader $1 from shared objects file]
[Loaded sun.net. www. ParseUtil from shared objects file]
[Loaded java. util. BitSet from shared objects file]
[Loaded java.net. URL from shared objects file]
[Loaded java. util. Locale from shared objects file]
[Loaded java. lang. CharacterDataLatin1 from shared objects file]
[Loaded java.net. Parts from shared objects file]
[Loaded java.net. URLStreamHandler from shared objects file]
[Loaded sun.net. www. protocol. file. Handler from shared objects file]
[Loaded java. util. HashSet from shared objects file]
[Loaded sun. misc. URLClassPath from shared objects file]
[Loaded java. util. ArrayList from shared objects file]
[Loaded sun.net. www. protocol. jar. Handler from shared objects file]
[Loaded sun. misc. Launcher $ AppClassLoader from shared objects file]
[Loaded sun. misc. Launcher $ AppClassLoader $1 from shared objects file]
[Loaded java. lang. SystemClassLoaderAction from shared objects file]
[Loaded java.net. URLClassLoader $1 from shared objects file]
[Loaded sun. misc. URLClassPath $3 from shared objects file]
[Loaded sun. misc. URLClassPath $ Loader from shared objects file]
[Loaded sun. misc. URLClassPath $ JarLoader from shared objects file]
[Loaded sun. misc. FileURLMapper from shared objects file]
[Loaded java.util.zip. ZipConstants from shared objects file]
[Loaded java.util.zip. ZipFile from shared objects file]
[Loaded java. util. jar. JarFile from shared objects file]
[Loaded sun. security. action. LoadLibraryAction from shared objects file]
[Loaded sun. misc. JavaUtilJarAccess from shared objects file]
[Loaded java. util. jar. JavaUtilJarAccessImpl from shared objects file]
[Loaded sun. misc. JarIndex from shared objects file]
[Loaded sun. misc. ExtensionDependency from shared objects file]
[Loaded java.util.zip. ZipEntry from shared objects file]
[Loaded java. util. jar. JarEntry from shared objects file]
[Loaded java. util. jar. JarFile $ JarFileEntry from shared objects file]
[Loaded java. io. DataInput from shared objects file]
[Loaded java. io. DataInputStream from shared objects file]
[Loaded java.util.zip. ZipFile $ ZipFileInputStream from shared objects fil
[Loaded java.util.zip. InflaterInputStream from shared objects file]
[Loaded java.util.zip. ZipFile $2 from shared objects file]
[Loaded java.util.zip. Inflater from shared objects file]
[Loaded java. lang. Math from shared objects file]
[Loaded java. Security. privilegedactionexception from shared objects File
[Loaded sun. Misc. urlclasspath $ fileloader from shared objects file]
[Loaded java. Io. Reader from shared objects file]
[Loaded java. Io. bufferedreader from shared objects file]
[Loaded java. Io. inputstreamreader from shared objects file]
[Loaded sun. NiO. cs. streamdecoder from shared objects file]
[Loaded sun. NiO. cs. historicallynamedcharset from shared objects file]
[Loaded sun. NiO. cs. utf_8 from shared objects file]
[Loaded sun. NiO. cs. streamdecoder $ charsetsd from shared objects file]
[Loaded sun. NiO. cs. utf_8 $ decoder from shared objects file]
[Loaded sun. NiO. cs. Surrogate $ generator from shared objects file]
[Loaded java. util. abstractsequentiallist from shared objects file]
[Loaded java. util. queue from shared objects file]
[Loaded java. util. writable list from shared objects file]
[Loaded java. util. writable list $ entry from shared objects file]
Exception in thread "Main" Java. Lang. noclassdeffounderror: helloword
[Loaded java. Lang. Shutdown From shared objects file]
[Loaded java. Lang. Shutdown $ lock from shared objects file]

You can compile a smaller class L;