StringReader 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 StringReader 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 // StringReader read(CharBuffer) method import java.io.*; import java.util.*; import java.nio.CharBuffer; class GFG { public static void main(String[] args) { try { String str = "GeeksForGeeks"; // Create a StringReader instance StringReader reader = new StringReader(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 // StringReader read(CharBuffer) method import java.io.*; import java.util.*; import java.nio.CharBuffer; class GFG { public static void main(String[] args) { try { String str = "GeeksForGeeks"; // Create a StringReader instance StringReader reader = new StringReader(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 StringReader read(CharBuffer) method in Java with Examples C code_r Follow Improve Article Tags : Java Java-Functions Java-IO package Java-StringReader Practice Tags : Java Similar Reads Java Tutorial Java is a high-level, object-oriented programming language used to build web apps, mobile applications, and enterprise software systems. 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