Exception Handling & I/O Streams

What is Stream

• It is a sequence of Bytes

• It is flow of input data

• It a flow of only output data

• It is not related to Java

How many Streams are there in JAVA

• 2

• 3

• 8

• 1

What is the output of the following code:

import java.io.*;

class File1

{

static public void main(String...args)

{

FileOutputStream f=new FileOutputStream("gec.txt");

f.write(67);

f.close();

}}

• This program writes ASCII character into file

• Compile time error

• Runtime error

• This program writes 67 into file

What is the output of the following code:

class A

{

void display() throws IOException

{

System.out.println("I am class A");

}

static public void main(String...args)

{

A r=new A();

r.display();

}}

• Compile time error

• Runtime error

• I am class A

• either compile time or runtime error

Predict the output of the following code:

class A

{

public static void main(String...args)

{

try{

System.out.println(23/0);

}

catch(Exception e){

System.out.print("hai it is an error");

}

catch(Throwable e)

{

System.out.print("hello it is an error ");

}}}

• hai it is an error

• hello it is an error

• compile time error

• runtime error

• both hai it is an error and hello it is an error

Streams are belongs to

• import java.io.*;

• import java.lang.*;

• import java.util.*

• import java.awt.*;

Reader and Writer classes belongs to

• Byte Streams

• Character Streams

• InputStream

• OutputStream

import java.io.*;

public class File1

{

static public void main(String...args) throws IOException

{

FileOutputStream k=new FileOutputStream("d:/ss.txt");

k.write("hello world");

k.close();

}}

• Compile time error

• hello world is posted into ss.txt file

• Runtime error

• Filenotfound error

Which of the following class(es) is/are related to Byte Stream class

• OutputStream

• FileInputStream

• FileReader

• CharArrayReader

What is the purpose of "File" class in Streams

• used to get the properties of file

• used to write data into file

• used to read data from file

• used to access data from file using random access methods