CharacterStream is a library available for Java. It is a rewrite of the character utilities of GDI to support Unicode characters beyond the 16-bit of Windows. It’s designed to be faster and easier to use than its predecessor.
CharacterStream is a free software library for writing and loading ASCII-art typefaces (e.g. “Arial”), which are used for casual text-based UI in desktop and mobile applications. CharacterStream is a highly scalable font rendering system, which supports all Unicode characters with complete support for East Asian, Hebrew, Arabic, and other complex scripts.
For those who are not familiar, CharacterStream is a “stream” type data structure (as opposed to a “list” type structure) that lets you easily search for elements in a stream. Think of it like a string in traditional programming languages, but with a few key differences: it’s element-specific, elements are guaranteed to be unique, the elements can be sorted, and the elements can be filtered while still being kept in the order they were originally read.
In the previous lesson, we knew that Java’s byte stream classes provide enough functionality to handle one byte (i.e., 8 bits) of each type of input/output operation. However, working directly with 16-bit Unicode characters is not compatible. To overcome this problem, the Java platform later added CharacterStream classes to support characters. CharacterStream classes have been added in Java version 1.1. It was not part of the language when it was released in 1995. Java CharacterStream classes are used to read and write 16-bit Unicode characters. In other words: Character stream classes are mainly used to read characters from the source and write them to the destination. You can perform operations on characters, character arrays, and character strings. Message: Unicode is a 2-byte, 16-bit character set that contains 65,536 (or 2^16) different possible characters. In practice, only about 40,000 characters are used; the rest is reserved for future use. It can work with most of the modern languages of the world.
Types of the class CharacterStream in Java
Like byte-stream classes, character-stream classes contain two types of classes. They are listed as follows:
- Read stream classes
- Writing course
Let’s look at the classes child of the reader and child of the author in detail one by one.
Ongoing reading course
Reader thread classes are used to read characters from files. Reader is an abstract superclass for all other subclasses such as BufferedReader, StringReader, CharArrayReader, etc. It implements the interfaces Closeable, AutoCloseable and Readable. The general syntax of the Reader class is as follows: public abstract class Reader from Object implements Readable, Lockable The hierarchy of reading stream classes is illustrated in the following figure. 
The classes belonging to the class read flow are very similar in functionality to the classes input flow. The only difference is that the input stream uses bytes, while the read stream classes use characters. In fact, the byte stream and character stream classes use the same methods. Therefore, the reading classes can perform all the operations implemented by the input flow classes.
Player class constructor
The Java Reader class defines the following constructors with protected access modifiers. These include: (a) Protected reader(): This form of constructor creates a new character stream reader whose critical sections are synchronized with the reader itself. b) Protected station (locked object) : This form of constructor creates a new character stream reader whose critical sections are synchronized with the specified object. Let’s briefly understand the subclasses of the Reader class. 1. BufferedReader : This class is used to read characters from a buffered character input stream. 2. CharArrayReader : This class is used to read characters from a char or an array of characters. 3. FileReader : This class is used to read the characters (or contents) of a file. 4. FilterReader : This class is used to read characters from a simple character input stream. 5. InputStreamReader : This class is used to translate (or convert) bytes into characters. 6. PipeReader : This class is used to read characters from the output stream of the connected pipeline. 7. StringReader : This class is used to read characters from a string. 8. PushBackReader : This class allows you to return one or more characters to the input stream.
Methods of the class Reader in Java
The methods of the Reader class define the following methods: 1. int read() : This method returns the integer representation of the next character in the calling input stream. It returns -1 when the end of the input is reached. 2. int read(char buffer[ ]) : This method is used to read characters up to the specified buffer length. Returns the current number of successfully read characters. It returns -1 when the end of the input is reached. 3. int read(char buffer[ ], int loc, int numChars) : This method reads up to numChars characters from the buffer, starting at the specified position. Returns the number of characters read successfully. Returns -1 when the end of the input is reached. 4. void mark(int numChars) : This method is used to mark the current point in the input stream, which remains until numChars characters are read. 5. void reset() : The reset() method is used to reset the input pointer to the previous setting mark. 6. long skip(long numChars) : The skip() method is used to skip a specified number of numChars characters from the input stream and returns the number of characters actually skipped. 7. boolean ready() : This method returns a true message if the next input request is ready (i.e., not pending). Otherwise the return is false. 8. void close() : This method is used to close the input current. If the program tries to read the input data further, it generates an IOException. 9. boolean markSupported( ) : This method returns the boolean value true if mark( )/reset( ) is supported for the specified thread. All methods of the Reader class (except markSupported( )) throw an IOException on error.
Writer’s flow course
The Writer thread classes are used to write characters to a file. In other words: They are used to perform all output operations on the files. Record stream classes are similar to output stream classes, except that output stream classes use bytes to record, while record stream classes use characters to record. In fact, the output stream and write stream classes use the same methods. Like the Reader class, the Writer class is an abstract class that acts as a superclass for all other child classes of the Writer. It implements the Appendable, Closeable and Flushable interfaces. The general syntax of the Writer class is given below: public abstract class Writer extends Object implements Appendable, Closeable, Flushable The Writer class is intended to write 16-bit Unicode characters to the output stream. Since the class Writer is an abstract class, it cannot be instantiated. Therefore, the subclasses of the Writer class are used to write characters to the output stream. The hierarchical diagram of the subclasses of the class Writer is shown in the following figure. 
Writer class constructor
The Writer class in Java defines the following constructors with protected access modifiers 1. Writer() protected : This form of constructor builds a new character stream writing program whose critical sections are synchronized with the writing program itself. 2. protected Writer(Object lock) : This form of constructor creates a new writable character stream whose critical sections are synchronized with this object. Let’s briefly describe the subclasses of the Writer class. 1. BufferedWriter: This class is used to write characters to the buffered output character stream. 2. FileWriter : This output stream class writes characters to a file. 3. CharArrayWriter : This output stream class writes characters to a character array. 4. OutpuStreamWriter : This output stream class translates or converts bytes to characters. 5. PipedWriter : This class writes characters to the output stream of the pipeline. 6. StringWriter : This output stream class writes characters to a string. 7. PrintWriter : This output stream class contains the print() and println() functions. 8. FilterReader : This class is used to write characters to the underlying character output stream.
Methods of the writer class in Java
The Stream Writer class in Java defines the following methods to write characters to the output stream: 1. void write() : The write() method is used to write data to the output stream of the caller. 2. void write(int ch) : This method is used to write a single character to the calling output stream. 3. void write(char buffer[ ]) : This method writes a full array of characters to the calling output stream. 4. void write(char buffer [ ], int loc, int numChars) : This method writes the numChars subrange of the string to the output stream from the specified position. 5. void write(String str) : This method writes the string to the output stream of the caller. 6. void write(String str, int loc, int numChars) : This method writes a subset of numChars characters from the string str, starting at the specified position. 7. void close () : This method is used to close the output stream. An IOException is thrown if an attempt is made to write to the output stream after it is closed. void flush () : This method flushes the output stream and writes the pending characters to the buffer. 9. Writer append(char ch) : The append() method appends the character ch to the end of the calling output stream. Returns a reference to the calling output stream. 10. Writer append(CharSequence chars) : This method adds characters to the end of the calling output stream. Returns a reference to the calling output stream. All methods defined in the Writer Thread class throw an IOException on error. I hope this tutorial has covered all the important points about CharacterStream classes in Java. I hope you understand the basics of reader flow and writer flow. In the next lesson, we will study the File class in Java. Thanks for reading!!!CharacterStream is a Java library designed to obtain and store character data, such as text, image, or audio, in a stream. It has a simple API that is very easy to use.. Read more about character stream classes in java ppt and let us know what you think.
Frequently Asked Questions
What are character stream classes?
CharacterStream is an open source Java library for character, line, and paragraph processing in plain text files, used by the TextFires project . CharacterStream is a function in Java that returns a CharacterStream object. This is similar to the String class in the Java programming language. A CharacterStream object can be used to store data such as a string of characters. For example, the following example creates a CharacterStream object. The loop is used to read the first ten characters from the stream.
What is an example of character stream?
CharacterStream is a Java class that�s used to store a stream of character data. This class is used to store string objects instead of character arrays, since Java�s string class does not allow to read characters backward. You may have heard of character streams . They are a recent addition to Java 8 and are very useful. Character streams are a way of storing character data. They allow you to create streams of characters that can be compressed and decompressed as required. Character streams can be used to create streams of text, or for creating streams of binary data. They can also be used to create streams of radio data. Character streams can be used to store character data that can be compressed and decompressed and can be of any size.
What is the use of character stream?
Java is a very popular programming language, because it is known as a very systematic language used to program programs. There are so many features in Java such as Java APIs, Java Collections, Java Streams and Java Remoting. For this one I had to go all the way to the blog’s about section to find a post title, sometimes these are difficult to find since they are hidden in the side bar.
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