![Search a word in a file in java word Search a word in a file in java word](/uploads/1/3/3/2/133278825/887720901.jpg)
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Print all the strings that match a given pattern from a file: String Operation « Regular Expressions « Java. Using StringTokenizer class to get the word count of a given file. Skip navigation. Dropbox download photos to mac. Counting words in a given file using java program. Count the number of occurrences of each word by Java. Apache POI Word Document - Learn Apache POI Word in simple and easy steps starting from basic to advanced concepts with examples including Overview, Apache POI Installation, Core Classes, Document, Paragraph, Borders, Tables, Font Style and Alignment, Text Extraction.
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Problem Description
Serial experiments lain ost rar. How to search a word inside a string ?
Solution
This example shows how we can search a word within a String object using indexOf() method which returns a position index of a word within the string if found. Otherwise it returns -1.
Result
The above code sample will produce the following result. Free dvd installer for laptop.
This example shows how we can search a word within a String object
Result
The above code sample will produce the following result.
java_strings.htm
There are multiple ways of writing and reading a text file. this is required while dealing with many applications.
There are several ways to read a plain text file in Java e.g. you can use FileReader, BufferedReader or Scanner to read a text file. Every utility provides something special e.g. BufferedReader provides buffering of data for fast reading, and Scanner provides parsing ability.
Broksonic drvcr900 manual download. We can also use both BufferReader and Scanner to read a text file line by line in Java. Then Java SE 8 introduces another Stream class java.util.stream.Stream which provides a lazy and more efficient way to read a file
Note : Here usual practices of writing good code like flushing/closing streams, Exception-Handling etc, have been avoided for better understanding of codes by beginners as well
Reading File In Java
Here are some of the many ways of reading files:
- Using BufferedReader: This method reads text from a character-input stream. It does buffering for efficient reading of characters, arrays, and lines.
The buffer size may be specified, or the default size may be used. The default is large enough for most purposes.In general, each read request made of a Reader causes a corresponding read request to be made of the underlying character or byte stream. It is therefore advisable to wrap a BufferedReader around any Reader whose read() operations may be costly, such as FileReaders and InputStreamReaders. For example,// Java Program to illustrate reading from FileReader
import
java.io.*;
{
public
static
void
main(String[] args)
throws
Exception
// We need to provide file path as the parameter:
// double backquote is to avoid compiler interpret words
File file =
new
File(
'C:UserspankajDesktoptest.txt'
);
BufferedReader br =
new
BufferedReader(
new
FileReader(file));
String st;
System.out.println(st);
}
- Using FileReader class: Convenience class for reading character files. The constructors of this class assume that the default character encoding and the default byte-buffer size are appropriate.
Constructors defined in this class are:// FileReader using FileReader
public
class
ReadingFromFile
public
static
void
main(String[] args)
throws
Exception
// pass the path to the file as a parameter
new
FileReader(
'C:UserspankajDesktoptest.txt'
);
int
i;
System.out.print((
char
) i);
}
- Using Scanner class: A simple text scanner which can parse primitive types and strings using regular expressions.
A Scanner breaks its input into tokens using a delimiter pattern, which by default matches whitespace. The resulting tokens may then be converted into values of different types using the various next methods.// Java Program to illustrate reading from Text File
import
java.io.File;
public
class
ReadFromFileUsingScanner
public
static
void
main(String[] args)
throws
Exception
// pass the path to the file as a parameter
new
File(
'C:UserspankajDesktoptest.txt'
);
System.out.println(sc.nextLine());
}
- Using Scanner class but without using loops:
// Java Program to illustrate reading from FileReader
// without using loop
import
java.io.FileNotFoundException;
{
throws
FileNotFoundException
File file =
new
File(
'C:UserspankajDesktoptest.txt'
);
sc.useDelimiter(
'Z'
);
System.out.println(sc.next());
}
- Reading the whole file in a List: Read all lines from a file. This method ensures that the file is closed when all bytes have been read or an I/O error, or other runtime exception, is thrown. Bytes from the file are decoded into characters using the specified charset.This method recognizes the following as line terminators:
// Java program to illustrate reading data from file
import
java.util.*;
import
java.nio.file.*;
public
class
ReadFileIntoList
public
static
List<String> readFileInList(String fileName)
try
lines =
Files.readAllLines(Paths.get(fileName), StandardCharsets.UTF_8);
{
// do something
}
}
{
List l = readFileInList(
'C:UserspankajDesktoptest.java'
);
Iterator<String> itr = l.iterator();
System.out.println(itr.next());
}
- Read a text file as String in Java:
// Java Program to illustrate reading from text file
package
io;
public
class
ReadTextAsString
public
static
String readFileAsString(String fileName)
throws
Exception
String data =
'
;
data =
new
String(Files.readAllBytes(Paths.get(fileName)));
}
public
static
void
main(String[] args)
throws
Exception
String data = readFileAsString(
'C:UserspankajDesktoptest.java'
);
}
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http://docs.oracle.com/javase/tutorial/essential/io/
http://docs.oracle.com/javase/tutorial/essential/io/
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