Java2bigdata: 2023

Friday, 14 April 2023

What is Java IO?

Check this out: java.io package hierarchy

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Thursday, 13 April 2023

Java IO Stream Hierarchy & All Java Packages Hierarchy

In this post I would like you to understand and gain knowledge by yourself of all Java packages hierarchy . you just need to follow me and do these steps.

The first step, You must navigate to the Java API
Second step, Search for any package you want to see the hierarchy. In this post I would like to provide java.io package hierarchy
Finally, just click on TREE tab on the API page which you can see on upper toolbar of the page

I would like you to start above step by this link java.io Class Hierarchy (Java SE 9 & JDK 9 ) (oracle.com)

Here is the hierarchy java.io package

Class Hierarchy

java.lang.Object
- java.io.Console (implements java.io.Flushable)
- java.io.File (implements java.lang.Comparable<T>, java.io.Serializable)
- java.io.FileDescriptor
- java.io.InputStream (implements java.io.Closeable)
  - java.io.ByteArrayInputStream
  - java.io.FileInputStream
  - java.io.FilterInputStream
    - java.io.BufferedInputStream
    - java.io.DataInputStream (implements java.io.DataInput)
    - java.io.LineNumberInputStream
    - java.io.PushbackInputStream
  - java.io.ObjectInputStream (implements java.io.ObjectInput, java.io.ObjectStreamConstants)
  - java.io.PipedInputStream
  - java.io.SequenceInputStream
  - java.io.StringBufferInputStream
- java.io.ObjectInputFilter.Config
- java.io.ObjectInputStream.GetField
- java.io.ObjectOutputStream.PutField
- java.io.ObjectStreamClass (implements java.io.Serializable)
- java.io.ObjectStreamField (implements java.lang.Comparable<T>)
- java.io.OutputStream (implements java.io.Closeable, java.io.Flushable)
  - java.io.ByteArrayOutputStream
  - java.io.FileOutputStream
  - java.io.FilterOutputStream
    - java.io.BufferedOutputStream
    - java.io.DataOutputStream (implements java.io.DataOutput)
    - java.io.PrintStream (implements java.lang.Appendable, java.io.Closeable)
  - java.io.ObjectOutputStream (implements java.io.ObjectOutput, java.io.ObjectStreamConstants)
  - java.io.PipedOutputStream
- java.security.Permission (implements java.security.Guard, java.io.Serializable)
  - java.security.BasicPermission (implements java.io.Serializable)
    - java.io.SerializablePermission
  - java.io.FilePermission (implements java.io.Serializable)
- java.io.RandomAccessFile (implements java.io.Closeable, java.io.DataInput, java.io.DataOutput)
- java.io.Reader (implements java.io.Closeable, java.lang.Readable)
  - java.io.BufferedReader
    - java.io.LineNumberReader
  - java.io.CharArrayReader
  - java.io.FilterReader
    - java.io.PushbackReader
  - java.io.InputStreamReader
    - java.io.FileReader
  - java.io.PipedReader
  - java.io.StringReader
- java.io.StreamTokenizer
- java.lang.Throwable (implements java.io.Serializable)
  - java.lang.Error
    - java.io.IOError
  - java.lang.Exception
    - java.io.IOException
      - java.io.CharConversionException
      - java.io.EOFException
      - java.io.FileNotFoundException
      - java.io.InterruptedIOException
      - java.io.ObjectStreamException
        java.io.InvalidClassException
        java.io.InvalidObjectException
        java.io.NotActiveException
        java.io.NotSerializableException
        java.io.OptionalDataException
        java.io.StreamCorruptedException
        java.io.WriteAbortedException
      - java.io.SyncFailedException
      - java.io.UnsupportedEncodingException
      - java.io.UTFDataFormatException
    - java.lang.RuntimeException
      - java.io.UncheckedIOException
- java.io.Writer (implements java.lang.Appendable, java.io.Closeable, java.io.Flushable)
  - java.io.BufferedWriter
  - java.io.CharArrayWriter
  - java.io.FilterWriter
  - java.io.OutputStreamWriter
    - java.io.FileWriter
  - java.io.PipedWriter
  - java.io.PrintWriter
  - java.io.StringWriter

Interface Hierarchy

java.lang.AutoCloseable
- java.io.Closeable
- java.io.ObjectInput (also extends java.io.DataInput)
- java.io.ObjectOutput (also extends java.io.DataOutput)
java.io.DataInput
- java.io.ObjectInput (also extends java.lang.AutoCloseable)
java.io.DataOutput
- java.io.ObjectOutput (also extends java.lang.AutoCloseable)
java.io.FileFilter
java.io.FilenameFilter
java.io.Flushable
java.io.ObjectInputFilter
java.io.ObjectInputFilter.FilterInfo
java.io.ObjectInputValidation
java.io.ObjectStreamConstants
java.io.Serializable
- java.io.Externalizable

Enum Hierarchy

java.lang.Object

java.lang.Enum<E> (implements java.lang.Comparable<T>, java.io.Serializable)

java.io.ObjectInputFilter.Status

Here are the list of few package you go ahead and check the hierarchy

java.lang: java.lang (Java SE 9 & JDK 9 ) (oracle.com)

java.util: java.util Class Hierarchy (Java SE 9 & JDK 9 ) (oracle.com)

If you enjoyed this post, I’d be very grateful if you’d help it spread by emailing it to a friend, or sharing it on Twitter or Facebook. Thank you

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