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CharArrayReader read(CharBuffer) method in Java with Examples

Last Updated : 11 Jul, 2025
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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:
Output:
Geeks
Program 2:
Output:
GeeksForGeeks
Reference: https://docs.oracle.com/javase/9/docs/api/java/io/Reader.html#read-java.nio.CharBuffer-

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