CharArrayReader read(CharBuffer) method in Java with Examples Last Updated : 11 Jul, 2025 Summarize Comments Improve Suggest changes Share Like Article Like Report The read(CharBuffer) method of CharArrayReader Class in Java is used to read the specified characters into a CharBuffer instance. This method blocks the stream till: It has taken some input from the stream. Some IOException has occurred It has reached the end of the stream while reading. Syntax: public int read(CharBuffer charBuffer) Parameters: This method accepts a mandatory parameter charBuffer which is the CharBuffer instance to be written in the Stream. Return Value: This method returns an integer value which is the number of characters read from the stream. It returns -1 if no character has been read. Exception: This method throws following exceptions: IOException: if some error occurs while input output. NullPointerException: if the CharBuffer instance to be filled is null ReadOnlyBufferException: if the CharBuffer instance to be filled is a read only buffer Below methods illustrates the working of read(CharBuffer) method: Program 1: Java // Java program to demonstrate // CharArrayReader read(CharBuffer) method import java.io.*; import java.util.*; import java.nio.CharBuffer; class GFG { public static void main(String[] args) { try { char[] str = { 'G', 'e', 'e', 'k', 's', 'F', 'o', 'r', 'G', 'e', 'e', 'k', 's' }; // Create a CharArrayReader instance CharArrayReader reader = new CharArrayReader(str); // Get the CharBuffer instance // to be read from the stream CharBuffer charBuffer = CharBuffer.allocate(5); // Read the charBuffer // to this reader using read() method // This will put the str in the stream // till it is read by the reader reader.read(charBuffer); // Print the read charBuffer System.out.println(charBuffer .flip() .toString()); reader.close(); } catch (Exception e) { System.out.println(e); } } } Output: Geeks Program 2: Java // Java program to demonstrate // CharArrayReader read(CharBuffer) method import java.io.*; import java.util.*; import java.nio.CharBuffer; class GFG { public static void main(String[] args) { try { char[] str = { 'G', 'e', 'e', 'k', 's', 'F', 'o', 'r', 'G', 'e', 'e', 'k', 's' }; // Create a CharArrayReader instance CharArrayReader reader = new CharArrayReader(str); // Get the CharBuffer instance // to be read from the stream CharBuffer charBuffer = CharBuffer .allocate(13); // Read the charBuffer // to this reader using read() method // This will put the str in the stream // till it is read by the reader reader.read(charBuffer); // Print the read charBuffer System.out.println(charBuffer .flip() .toString()); reader.close(); } catch (Exception e) { System.out.println(e); } } } Output: GeeksForGeeks Reference: https://docs.oracle.com/javase/9/docs/api/java/io/Reader.html#read-java.nio.CharBuffer- Comment More infoAdvertise with us Next Article CharArrayReader read() method in Java with Examples C code_r Follow Improve Article Tags : Java Java-Functions Java-IO package Java-CharArrayReader Practice Tags : Java Similar Reads CharArrayReader read() method in Java with Examples The read() method of CharArrayReader Class in Java is used to read a single character from the stream. This method blocks the stream till: It has taken some input from the stream. Some IOException has occurred It has reached the end of the stream while reading. This method is declared as abstract me 3 min read CharArrayReader read() method in Java with Examples The read() method of CharArrayReader Class in Java is used to read a single character from the stream. This method blocks the stream till: It has taken some input from the stream. Some IOException has occurred It has reached the end of the stream while reading. This method is declared as abstract me 3 min read CharArrayReader ready() method in Java with Examples The ready() method of CharArrayReader Class in Java is used to check whether this CharArrayReader is ready to be read or not. It returns a boolean which states if the reader is ready. Syntax: public void ready() Parameters: This method does not accepts any parameters Return Value: This method return 3 min read CharArrayReader ready() method in Java with Examples The ready() method of CharArrayReader Class in Java is used to check whether this CharArrayReader is ready to be read or not. It returns a boolean which states if the reader is ready. Syntax: public void ready() Parameters: This method does not accepts any parameters Return Value: This method return 3 min read CharArrayReader read(char[]) method in Java with Examples The read(char[]) method of CharArrayReader Class in Java is used to read the specified characters into an array. This method blocks the stream till: It has taken some input from the stream. Some IOException has occurred It has reached the end of the stream while reading. Syntax: public int read(char 2 min read CharArrayReader read(char[]) method in Java with Examples The read(char[]) method of CharArrayReader Class in Java is used to read the specified characters into an array. This method blocks the stream till: It has taken some input from the stream. Some IOException has occurred It has reached the end of the stream while reading. Syntax: public int read(char 2 min read Like