Which class is used to read data from a file using DataInputStream in Java?

Java MCQ: Which class is used to read data from a file using DataInputStream in Java?

Answer:

Explanation:

The DataInputStream class in Java is used to read primitive data types from an input stream in a machine-independent way. It is part of the java.io package and is typically used in conjunction with a FileInputStream to read data from files.

Here’s an example of how to use DataInputStream to read data from a file:

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

public class ReadFileDataInputStream {
    public static void main(String[] args) {
        try (DataInputStream dis = new DataInputStream(new FileInputStream("example.dat"))) {
            int data = dis.readInt();
            System.out.println("Read integer: " + data);
        } catch (IOException e) {
            System.out.println("An error occurred while reading the file.");
            e.printStackTrace();
        }
    }
}

In this example, a DataInputStream is created to wrap a FileInputStream object. The readInt() method is used to read an integer from the file example.dat. The integer is then printed to the console. The DataInputStream class provides methods like readInt(), readDouble(), readUTF(), and others to read different types of data from a file.

DataInputStream is particularly useful when you need to read data that was written using a DataOutputStream, ensuring that the data is read in the correct format and is platform-independent.

This class is essential for reading structured binary data from files, such as when working with custom file formats or data that includes a mix of primitive types.

Reference links:

https://www.rameshfadatare.com/learn-java-programming/
https://www.javaguides.net/p/java-tutorial-learn-java-programming.html