Reading Lines from a String Using a Regular Expression
You will learn how to separate a string by detecting
the line. An example has been given in the section for the best illustration of
the procedure of reading of line from the file.
Program Result:
Following program takes a text file name and reads all
the string or text from the file. This program also detects the new line
character "\n" and shows all the string or text before occurring the
new line character.
Here is the code of the program:
import java.util.regex.*;
import java.io.*;
public class ReadLines{
public static void main(String[] args)
throws IOException,InterruptedException{
BufferedReader in = new BufferedReader
(new InputStreamReader(System.in));
System.out.println("Enter file name: ");
String filename = in.readLine();
File file = new File(filename);
if(!filename.endsWith(".txt")){
System.out.println("File not in text format.");
System.exit(0);
}
else if(!file.exists()){
System.out.println("File not found.");
System.exit(0);
}
FileInputStream fstream = new FileInputStream(filename);
DataInputStream ds = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(ds));
Pattern p;
Matcher m;
String strLine;
String inputText = "";
while((strLine = br.readLine()) != null)
inputText = inputText + strLine + "\n";
String[] paras = Pattern.compile
("\n", Pattern.MULTILINE).split(inputText);
Thread th = new Thread();
for(int i=0; i<=paras.length-1; i++){
System.out.println(paras[i]);
th.sleep(1500);
}
}
}
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