Example usage for java.io PushbackReader unread

Introduction

In this page you can find the example usage for java.io PushbackReader unread.

Prototype

public void unread(char cbuf[], int off, int len) throws IOException 

Source Link

Document

Pushes back a portion of an array of characters by copying it to the front of the pushback buffer.

Usage

From source file:Main.java

public static void main(String[] args) {
    String s = "from java2s.com";

    StringReader sr = new StringReader(s);

    PushbackReader pr = new PushbackReader(sr, 20);

    try {//from   w w  w. j a va2  s . c  om
        for (int i = 0; i < 5; i++) {
            char c = (char) pr.read();
            System.out.println(c);
        }
        char cbuf[] = { 'w', 'o', 'r', 'l', 'd' };

        pr.unread(cbuf, 1, 4);

        for (int i = 0; i < 4; i++) {
            char c = (char) pr.read();
            System.out.println(c);
        }

        pr.close();

    } catch (IOException ex) {
        ex.printStackTrace();
    }
}

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