Java PushbackReader.unread(char[] cbuf, int off, int len)
Syntax
PushbackReader.unread(char[] cbuf, int off, int len) has the following syntax.
public void unread(char[] cbuf, int off, int len) throws IOException
Example
In the following code shows how to use PushbackReader.unread(char[] cbuf, int off, int len) method.
// ww w . jav a2s . c o m
import java.io.*;
public class Main {
public static void main(String[] args) {
String s = "from java2s.com";
StringReader sr = new StringReader(s);
PushbackReader pr = new PushbackReader(sr, 20);
try {
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();
}
}
}
The code above generates the following result.
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