java.io.StringBufferInputStream class helps in creating an Input Stream where, one can read bytes from the string. If we use this class we can only read lower 8 bits of each character present in the string.
But if we use ByteArrayInputStream, there is no restriction of reading only lower 8 bits of each character present in the string.
This class has been deprecated by Oracle and should not be used any more.
Declaration:
public class StringBufferInputStream extends InputStream
Constructor :
- StringBufferInputStream(String str) : Creates a string input stream to read data from the specified string.
Methods:
- read() : java.io.StringBufferInputStream.read() reads bytes of data from the Input Stream and returns -1 if end of the Stream is reached.
Syntax :public int read() Parameters : ----------- Return : Returns read character as an integer ranging from range 0 to 65535. -1 : when end of file is reached.
- read(byte[] buffer, int offset, int maxlen) : java.io.StringBufferInputStream.read(byte[] buffer, int offset, int maxlen)) reads bytes of data from the buffer starting at offset position up to maxlen and returns -1 if end of the Stream is reached.
Syntax :public int read(byte[] buffer, int offset, int maxlen)) Parameters : buffer : destination buffer to be read into offset : starting position from where to store characters maxlen : maximum no. of characters to be read Return : Returns all the characters read -1 : when end of file is reached.
- reset() : java.io.StringBufferInputStream.reset() resets the Input Stream and starts reading from the first character of ‘buffer’ present in the Input Stream.
Syntax :public void reset() Parameters : ----------- Return : void
- skip(long b) : java.io.StringBufferInputStream.skip(long b) skips ‘b’ bytes. Few bytes are skipped if end of file is reached.
Syntax :public long skip(long b) Parameters : b : no. of bytes to be skipped Return : no. of bytes skipped
- available() : java.io.StringBufferInputStream.available() tells the total no. of bytes available for reading.
Syntax :public int available() Parameters : ---------------- Return : total no. of bytes that can be read
// Java program illustrating the working of StringBufferInputStream class methods// read(), skip(), available(), reset()// read(char[] char_array, int offset, int maxlen) import java.io.*;public class NewClass{ public static void main(String[] args) throws IOException { String str1 = "Hello Geeks"; String str2 = "GeeksForGeeks"; StringBufferInputStream Geek_buffer1 = new StringBufferInputStream(str1); StringBufferInputStream Geek_buffer2 = new StringBufferInputStream(str2); // USe of available() : to count total bytes to be read System.out.println("Use of available() 1 : "+ Geek_buffer1.available()); int a = 0; System.out.print("Use of read() method : "); // Use of read() method : reading each byte one by one while((a = Geek_buffer1.read()) != -1) { // Converting byte to char char c1 = (char)a; System.out.println(c1); // Use of skip() method long char_no = Geek_buffer1.skip(1); System.out.println("Characters Skipped : "+ (c1+1)); } System.out.println(""); // USe of available() : to count total bytes to be read System.out.println("Use of available() 2 : "+ Geek_buffer2.available()); byte[] buffer = new byte[15]; // Use of read(char[] char_array, int offset, int maxlen): // reading a part of array Geek_buffer2.read(buffer, 1, 2); int b = 0; System.out.print("read(char[] char_array, int offset, int maxlen): "); while((b = Geek_buffer2.read()) != -1) { char c2 = (char)b; System.out.print(c2); } System.out.println(""); // Use of reset() : to reset str1 for reading again Geek_buffer1.reset(); int i = 0; System.out.print("\nUse of read() method again after reset() : "); // Use of read() method : reading each character one by one while((i = Geek_buffer1.read()) != -1) { char c3 = (char)i; System.out.print(c3); } }} |
Output :
Use of available() 1 : 11 Use of read() method : H Characters Skipped : 73 l Characters Skipped : 109 o Characters Skipped : 112 G Characters Skipped : 72 e Characters Skipped : 102 s Characters Skipped : 116 Use of available() 2 : 13 Use of read(char[] char_array, int offset, int maxlen) method : eksForGeeks Use of read() method again after reset() : Hello Geeks
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