Files in java

Jul 1, 20143 likes4,263 views

The document discusses different types of streams in Java including file, byte, character, and standard streams. File streams allow reading and writing of files and include classes like FileInputStream and FileOutputStream for bytes and FileReader and FileWriter for characters. Byte streams handle 8-bit bytes while character streams handle 16-bit Unicode. Standard streams in Java are System.in for input, System.out for standard output, and System.err for errors. Sample code is provided to write to and read from files.

File
● A collection of data or information that has a
name, called the filename.
● To access File in java, the package java.io.File
must be imported.
● There are many other File based classes in
the java.io package which has its own purpose

The Stream Classes
The basic stream classes in java are
● Byte stream classes
● Character stream classes
● Standard stream classes

Most read

Byte Stream classes
● Java byte streams are used to perform input
and output of 8-bit bytes.
● The most frequently used byte stream classes
are
– FileInputStream and
– FileOutputStream.

Character stream classes
● Java Byte streams are used to perform input
and output of 8-bit bytes, where as Java
Character streams are used to perform input
and output for 16-bit unicode.
● The most frequently used character stream
classes are
– FileReader and
– FileWriter.

Standard Stream
Java provides following three standard streams
●
Standard Input: This is used to feed the data to user's program
and usually a keyboard is used as standard input stream and
represented as System.in.
●
Standard Output: This is used to output the data produced by
the user's program and usually a computer screen is used to
standard output stream and represented as System.out.
●
Standard Error: This is used to output the error data produced
by the user's program and usually a computer screen is used to
standard error stream and represented as System.err.

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Garbage collection is the process of identifying used and unused objects in heap memory and deleting the unused objects. It involves marking referenced and unreferenced objects, then deleting unreferenced objects using normal deletion or compaction. Generational garbage collection focuses on young, old, and permanent generation objects, allocating to Eden space and copying/promoting referenced objects to older generations as they age over time.

Exception handlingMuthukumaran Subramanian

Exceptions are events that disrupt normal program flow, such as invalid user input or file access errors. Errors are problems beyond the programmer's control. Exceptions can be checked, which must be caught, or runtime, which can be ignored. The try block contains exception-prone code, catch handles specific exception types, and finally ensures cleanup. Common exceptions include NullPointerException and ArrayIndexOutOfBoundsException. Exception handling separates error handling from regular code and groups error types for easier management.

Date classMuthukumaran Subramanian

The document summarizes key aspects of the java.util.Date class including: 1) The java.util.Date class represents a specific point in time with millisecond precision, though most methods are deprecated in favor of Calendar. 2) The Date class has constructors that allow initializing a date from the current time or from a long value of milliseconds since January 1, 1970. 3) Common methods allow getting/setting the date, comparing dates, converting to string, and more.

Currency classMuthukumaran Subramanian

The document discusses the Java Currency class which represents currencies using their ISO 4217 currency codes. The Currency class is designed so that only one instance exists for each currency. It provides methods like getCurrencyCode(), getDefaultFractionDigits(), getInstance() to retrieve currency information by code or locale, and getSymbol() to get the currency symbol. An example program demonstrates using the Currency class.

Timer class in javaMuthukumaran Subramanian

The java.util.Timer class allows threads to schedule tasks for future execution in a background thread. It provides methods to schedule tasks for one-time or repeated execution at regular intervals. The TimerTask class represents tasks that can be scheduled by a Timer and defines a run() method representing the task's action. For example, a program could use Timer and TimerTask to schedule tasks to execute at set times in the future.

Calendar class in javaMuthukumaran Subramanian

The document discusses the Calendar and GregorianCalendar classes in Java. It provides details on their constructors, methods, and usage. Calendar is an abstract class that provides methods for converting between a date and calendar fields like year, month, etc. GregorianCalendar is a concrete subclass that implements the standard Gregorian calendar system. It supports both the Julian and Gregorian systems and handles leap years according to Gregorian rules. Examples are provided to demonstrate using these classes.

Classes and objects in javaMuthukumaran Subramanian

intorduction to Arrays in javaMuthukumaran Subramanian

This document discusses arrays in Java, including that an array holds homogeneous data of more than one number, arrays have a fixed length set at creation, and elements can be accessed by index or loop. It also covers initializing arrays, resizing arrays using Arrays.copyOf(), and different types of arrays such as one-dimensional, two-dimensional, and multi-dimensional arrays. Two-dimensional arrays are like tables with rows and columns.

Access modifiers in javaMuthukumaran Subramanian

Public access allows classes, methods, and fields to be accessed from any other class. Private access restricts access to only within the declared class. Protected access allows subclasses in other packages or classes within the package to access protected members. The default access level is equivalent to no access modifier specified, making classes only visible to other classes in the same package.

Abstract classesMuthukumaran Subramanian

Java introductionMuthukumaran Subramanian

This document provides an introduction to the Java programming language. It discusses what Java is, its history and origins, its key features such as being object-oriented, portable, and platform independent. It also covers Java versions and software development kits (SDKs), how the Java virtual machine works, and basic concepts in Java like classes, objects, encapsulation, inheritance, and interfaces.

Collections and genericsMuthukumaran Subramanian

The document provides an overview of Java's collection framework. It discusses the main collection interfaces like List, Set, and Map. It also describes some common general purpose collection classes like ArrayList, LinkedList, HashSet, TreeSet, and HashMap. The key points are: 1) The collection framework provides a unified architecture for representing and manipulating collections through common interfaces and classes. 2) Interfaces like List, Set, and Map define common operations for different collection types. General purpose classes implement these interfaces to provide standard collection functionality. 3) Common collection classes discussed include ArrayList for lists, LinkedList for linked lists, HashSet for hash-based sets, TreeSet for sorted sets, and HashMap

Struts introductionMuthukumaran Subramanian

Operators in javaMuthukumaran Subramanian

Threads concept in javaMuthukumaran Subramanian

StringTokenizer in javaMuthukumaran Subramanian

Overriding methodsMuthukumaran Subramanian

Oops (inheritance&interface)Muthukumaran Subramanian

Non access modifiersMuthukumaran Subramanian

Jdbc connectivity in javaMuthukumaran Subramanian

Garbage collection in javaMuthukumaran Subramanian

Exception handlingMuthukumaran Subramanian

Date classMuthukumaran Subramanian

Currency classMuthukumaran Subramanian

Timer class in javaMuthukumaran Subramanian

Calendar class in javaMuthukumaran Subramanian

Classes and objects in javaMuthukumaran Subramanian

intorduction to Arrays in javaMuthukumaran Subramanian

Access modifiers in javaMuthukumaran Subramanian

Abstract classesMuthukumaran Subramanian

Java introductionMuthukumaran Subramanian

Collections and genericsMuthukumaran Subramanian

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Files in java

1. File ● A collection of data or information that has a name, called the filename. ● To access File in java, the package java.io.File must be imported. ● There are many other File based classes in the java.io package which has its own purpose

2. The Stream Classes The basic stream classes in java are ● Byte stream classes ● Character stream classes ● Standard stream classes

3. Byte Stream classes ● Java byte streams are used to perform input and output of 8-bit bytes. ● The most frequently used byte stream classes are – FileInputStream and – FileOutputStream.

4. Character stream classes ● Java Byte streams are used to perform input and output of 8-bit bytes, where as Java Character streams are used to perform input and output for 16-bit unicode. ● The most frequently used character stream classes are – FileReader and – FileWriter.

5. Standard Stream Java provides following three standard streams ● Standard Input: This is used to feed the data to user's program and usually a keyboard is used as standard input stream and represented as System.in. ● Standard Output: This is used to output the data produced by the user's program and usually a computer screen is used to standard output stream and represented as System.out. ● Standard Error: This is used to output the error data produced by the user's program and usually a computer screen is used to standard error stream and represented as System.err.

6. Sample program to write into file

7. Sample program to read from file

8. Sample output for read from file

Files in java

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