How do you read a specific line from a text file in Java?

How read a specific data from a file in Java?

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.

How do you read a file line by line and write to another file in Java?

Simple Program

  1. import java.io.*;
  2. class file1 {
  3. public static void main(String arg[]) {
  4. File inf = new File(“in.dat”);
  5. File outf = new File(“out.dat”);
  6. FileReader ins = null;
  7. FileWriter outs = null;
  8. try {

How do you read a line in Word in Java?

Algorithm

  1. STEP 1: START.
  2. STEP 2: DEFINE String line.
  3. STEP 3: SET count =0.
  4. STEP 4: USE File Reader to open file in read mode.
  5. STEP 5: READ line from file.
  6. STEP 6: REPEAT STEP 7 to STEP 8 UNTIL reach the end of file.
  7. STEP 7: SPLIT lines into words and STORE in array string words[].
  8. STEP 8: count = count + words.length.

How do you read write a text file in Java?

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.

Methods:

  1. Using BufferedReader class.
  2. Using Scanner class.
  3. Using File Reader class.
  4. Reading the whole file in a List.
  5. Read a text file as String.
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How many ways we can read a file in Java?

5 Ways to Read a File in Java – BufferedReader, FileInputStream, Files, Scanner, RandomAccessFile.

Can you read and write to the same file in Java?

The folder or directory the file exist doesn’t matter in this case as the program will create a new file named “criteria. txt” in the same folder as the java program; however, you will have to open the file with a text editor to add/ append some data as the file will be blank initially.

What is Java Inputstream file?

A FileInputStream obtains input bytes from a file in a file system. What files are available depends on the host environment. FileInputStream is meant for reading streams of raw bytes such as image data. For reading streams of characters, consider using FileReader .

What is Randomaccessfile in Java?

This class is used for reading and writing to random access file. A random access file behaves like a large array of bytes. If end-of-file is reached before the desired number of byte has been read than EOFException is thrown. … It is a type of IOException.

Is BufferedReader faster than scanner?

BufferedReader has significantly larger buffer memory than Scanner. … BufferedReader is a bit faster as compared to scanner because scanner does parsing of input data and BufferedReader simply reads sequence of characters.

How do you read a character from a file in Java?

To read a character in Java, we use next() method followed by charAt(0). The next() method returns the next token/ word in the input as a string and chatAt() method returns the first character in that string. We use the next() and charAt() method in the following way to read a character.

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