CharArrayReader read(CharBuffer) method in Java with Examples Last Updated : 13 Feb, 2019 Comments Improve Suggest changes 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(CharBuffer) 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 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 close() method in Java with Examples The close() method of CharArrayReader Class in Java is used to close the stream and release the resources that were busy in the stream, if any. This method has following results: If the stream is open, it closes the stream releasing the resources If the stream is already closed, it will have no effe 3 min read CharArrayReader reset() method in Java with Examples The reset() method of CharArrayReader Class in Java is used to reset the stream. After reset, if the stream has been marked, then this method attempts to reposition it at the mark, else it will try to position it to the starting. Syntax: public void reset() Parameters: This method do not accepts any 3 min read CharBuffer read() methods in Java with Examples The read() method of java.nio.CharBuffer Class is used to read characters into the specified character buffer. The buffer is used as a repository of characters as-is: the only changes made are the results of a put operation. No flipping or rewinding of the buffer is performed. Syntax: public int rea 4 min read CharBuffer charAt() methods in Java with Examples The charAt() method of java.nio.CharBuffer Class is used to read the character at the given index relative to the current position. Syntax: public final char charAt(int index) Parameters: This method takes the index of the character to be read, relative to the position; must be non-negative and smal 2 min read CharArrayReader read(char[], int, int) method in Java with Examples The read(char[], int, int) method of CharArrayReader Class in Java is used to read the specified length characters into an array at a specified offset. 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 whil 3 min read CharBuffer append() methods in Java with Examples append(char c) The append(char c) method of java.nio.CharBuffer Class is used to append the specified char to this buffer (optional operation). An invocation of this method of the form dst.append(c) behaves in exactly the same way as the invocation dst.put(c) Syntax : public CharBuffer append(char c 6 min read Buffer array() methods in Java with Examples The array() method of java.nio.Buffer class is used to return the array that backs the taken buffer. This method is intended to allow array-backed buffers to be passed to native code more efficiently. Concrete subclasses provide more strongly-typed return values for this method. Modifications to thi 3 min read Like