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About Ilias Tsagklis

Ilias Tsagklis
Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.

Read char from file with DataInputStream

This is an example of how to read a char from a file with the DataInputStream. The DataInputStream lets an application read primitive Java data types from an underlying input stream in a machine-independent way. Reading a char from a file implies that you should:

  • Create a FileInputStream by opening a connection to an actual file, the file named by the path name name in the file system.
  • Create a DataInputStream with the FileInputStream.
  • Use readChar() API method. It reads two input bytes and returns a char value.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;

import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class ReadCharFromFileWithDataInputStream {
	
	public static void main(String[] args) {
		
		String filename = "input.txt";
		
		FileInputStream fis = null;
		DataInputStream dis = null;		

		try {
			
			fis = new FileInputStream(filename);

			dis = new DataInputStream(fis);

			char c = dis.readChar();
			
			System.out.println("Char read: " + c);
			
		}
		catch (FileNotFoundException fe) {
			System.out.println("File not found: " + fe);
		}
		catch (IOException ioe) {
			System.out.println("Error while reading file: " + ioe);
		}
		finally {
			try {
				if (dis != null) {
					dis.close();
				}
				if (fis != null) {
					fis.close();
				}
			}
			catch (Exception e) {
				System.out.println("Error while closing streams" + e);
			}
		}
	}
}

 
This was an example of how to read a char from a file with the DataOutputStream in Java.

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