DataInputStream readBoolean() method in Java with Examples

The readBoolean() method of DataInputStream class in Java is used to read one input byte and if the byte read is zero this method returns false and if the byte read is nonzero then this method returns true.

Syntax:

public final boolean readBoolean()
                throws IOException

Specified By: This method is specified by readBoolean() method of DataInput interface.

Parameters: This method does not accept any parameter.

Return value: This method returns the boolean value read i.e true or false.

Exceptions:

• EOFException – It throws EOFException if the input stream is ended.
• IOException – This method throws IOException if the stream is closed or some other I/O error occurs.

Below programs illustrate readBoolean() method in DataInputStream class in IO package:

Program 1:

// Java program to illustrate
// DataInputStream readBoolean() method
import java.io.*;
public class GFG {
    public static void main(String[] args)
        throws IOException
    {

        // Create byte array
        byte[] b = { 10, 0, 0, 20, 0 };

        // Create byte array input stream
        ByteArrayInputStream byteArrayInputStr
            = new ByteArrayInputStream(b);

        // Convert byte array input stream to
        // DataInputStream
        DataInputStream dataInputStr
            = new DataInputStream(
                byteArrayInputStr);

        while (dataInputStr.available() > 0) {
            // Print boolean value
            System.out.println(
                dataInputStr.readBoolean());
        }
    }
}

Output:

true
false
false
true
false

Program 2:

// Java program to illustrate
// DataInputStream readBoolean() method
import java.io.*;
public class GFG {
    public static void main(String[] args)
        throws IOException
    {

        // Create byte array
        byte[] b = { 10, 5, 7, 1, 0 };

        // Create byte array input stream
        ByteArrayInputStream byteArrayInputStr
            = new ByteArrayInputStream(b);

        // Convert byte array input stream to
        // DataInputStream
        DataInputStream dataInputStr
            = new DataInputStream(
                byteArrayInputStr);

        while (dataInputStr.available() > 0) {
            // Print boolean value
            System.out.println(
                dataInputStr.readBoolean());
        }
    }
}

Output:

true
true
true
true
false

References:
https://docs.oracle.com/javase/10/docs/api/java/io/DataInputStream.html#readBoolean()