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How to use PushbackInputStream class in java

Simond Gear 1946 07 Nov 2016

Hi Guys

I am beginner in java programming language and i want to use PushbackInputStream class.Please explain me with the help of program.

I would really appreciate your help.

Thanks

Simond Gear

Other

2 Answers

Hubert Jason 07 Nov 2016

Hey Simond check this program:


class PushbackInputStreamDemo { 
public static void main(String args[]) throws IOException { 
String s = "if (a == 4) a = 0;\\n"; 
byte buf[] = s.getBytes(); 
ByteArrayInputStream in = new ByteArrayInputStream(buf); 
PushbackInputStream f = new PushbackInputStream(in); 
int c; 
while ((c = f.read()) != -1) { 
switch(c) { 
case '=': 
if ((c = f.read()) == '=') 
System.out.print(".eq."); 
else { 
System.out.print("<-"); 
f.unread(c); 
} 
break; 
default: 
System.out.print((char) c); 
break; 
} 
} 
} 
}

Mark Devid 07 Nov 2016

Hi Simond

Check this program.I hope it will help you.

public class PrintCalc {
public static void main(String args[]) {
PrintCalc app = new PrintCalc();
try {
app.readAndPrint();
} catch (IOException e) {
System.out.println("Error encountered during 
printing");
}
}
private void readAndPrint() throws IOException {
PushbackInputStream f = new PushbackInputStream(System.in, 3);
int c, c1, c2;
while ((c = f.read()) != 'q') {
switch (c) {
case '.':
System.out.print((char) c);
if ((c1 = f.read()) == '0') {
if ((c2 = f.read()) == '0') {
System.out.print("**");
} else {
f.unread(c2);
f.unread(c1);
}
} else {
f.unread(c1);
}
break;
default:
System.out.print((char) c);
break;
}
}
 f.close();
}
}

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