Files and I/O
- What is the output of this program if input given is ‘prstquvwxyz’?
import java.util.*;
import java.io.*;
public class Main
{
public static void main(String args[]) throws IOException
{
char c;
BufferedReader obj = new BufferedReader(new InputStreamReader(System.in));
do
{
c = (char) obj.read();
System.out.print(c);
} while(c != 'q');
}
}
-
View Hint View Answer Discuss in Forum
NA
Correct Option: C
prstq
- Which of these class is used to read from byte array?
-
View Hint View Answer Discuss in Forum
NA
Correct Option: C
ByteArrayInputStream
- Which of these classes are used by character streams for input and output operations?
-
View Hint View Answer Discuss in Forum
NA
Correct Option: C
Character streams uses Writer and Reader classes for input & output operations.
- Which of these is used to perform all input & output operations in Java?
-
View Hint View Answer Discuss in Forum
NA
Correct Option: B
Like in any other language, streams are used for input and output operations.
- What is the output of this program?
import java.io.*;
public class Chararrayinput_Example
{
public static void main(String[] args)
{
String object = "pqrst";
int length = object.length();
char p[] = new char[length];
object.getChars(0, length, p, 0);
CharArrayReader input1 = new CharArrayReader(p);
CharArrayReader input2 = new CharArrayReader(p, 1, 4);
int K;
int L;
try
{
while ((K = input1.read()) == (L = input2.read()))
{
System.out.print((char)K);
}
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
-
View Hint View Answer Discuss in Forum
NA
Correct Option: E
No output is printed. CharArrayReader object input1 contains string “pqrst” whereas object input2 contains string “qrst”, when while((K=input1.read())==(L=input2.read())) is executed the starting character of each object is compared since they are unequal control comes out of loop and nothing is printed on the screen.
