Java Tutorial Lab 6

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2016 Winter
LAB #6
Prepared by: Berk Soysal

Java's IO package mostly concerns itself with the reading of
raw data from a source and writing of raw data to a
destinati...

• IO Streams are a core concept in Java IO. A stream is a
conceptually endless flow of data.
• You can either read from a ...

• A program that needs to read data from some source
needs an InputStream or a Reader. A program that needs
to write data ...

• Byte streams are associated with data-based (binary) I/O.
Examples of binary data include image and audio files, jpeg
an...

• You can get random access to files with Java IO via the
RandomAccessFile Class.
• Random access doesn't mean that you re...

• You can get random access to files with Java IO via the
RandomAccessFile Class.
• Random access doesn't mean that you re...

InputStream and OutputStream are two abstract classes that define the
methods that are common to all input and output stre...

The class OutputStream declares the following three methods.
• write(byte[] b): Writes b.length bytes from the specified b...

2016 Winter

Two objects are predefined and readily available for your
programs. System.in is an input stream associated with the
keybo...

Usually we follow 3 steps to write a file:
 Opening a file.
 Writing to that file.
 Closing the file.
 Closing the fil...

Reading from a file involves creating a FileInputStream object.
We’ll consider two constructors.
FileInputStream( String n...

Because a FileInputStream allows to read bytes only, Java defines an
InputStreamReader as bridge from byte to character st...

• int read( char [] b ): Reads characters into an array. Returns the number
of characters read, or −1 if the end of the st...

Write a class named Exercise1 that reads characters from
the keyboard using the method read( char[] b );
The maximum numbe...

For some applications, the input should be read one line at a
time. For this, you will be using an object of the class
Buf...

FileInputStream f = FileInputStream( "data.txt" );
InputStreamReader is = new InputStreamReader( f );
BufferedReader in = ...

Write a class named Exercise2 that prints all the lines that
contain a certain word.
For each line containing the word, pr...

Write a class named Exercise3 that counts the number of
occurrences of a given word within a file.
2016 Winter

Write a class Exercise4 that fetches the content of a Web
page and prints it on the console.
2016 Winter

There are two useful File utility methods, which can be used to create
directories:
mkdir( ) method creates a directory, r...

Writing to a file involves creating a FileOutputStream object.
We’ll consider two constructors.
FileOutputStream( String n...

Because a FileOutputStream allows to write bytes only, Java defines an
OutputStreamWriter as bridge from byte to character...

Modify the class Copy.java so that it has a second argument
that will be the name of a destination file. An accordingly,
w...

An exception (or exceptional event) is a problem that arises during the
execution of a program. When an Exception occurs t...

try {
//Protected code
} catch(ExceptionType1 e1) {
//Catch block 1
} catch(ExceptionType2 e2) {
//Catch block 2
}
The cod...

public class ExcepTest{
public static void main(String args[]){
int a[] = new int[2];
try{
System.out.println("Access elem...

IOException
“Signals that an I/O exception of some sort has occurred. This
class is the general class of exceptions produc...

Again here, the solution proposed by Java is more complex than with most
other programming languages.
java.text.Format
For...

Sometimes this what you want and sometimes not (e.g. printing dollar
amounts). In order to print only a fixed number of de...

2016 Winter

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