Java: Get the contents of a given string as a byte array

Last update on May 21 2025 12:50:47 (UTC/GMT +8 hours)

16. Get Byte Array from String

Write a Java program to get the contents of a given string as a byte array.

Sample Solution:

Java Code:

// Import the Calendar class from the java.util package.
import java.util.Calendar;

// Define a public class named Exercise16.
public class Exercise16 {
    // Define the main method.
    public static void main(String[] args) {
        // Declare and initialize a string variable.
        String str = "This is a sample String.";

        // Copy the contents of the string to a byte array.
        byte[] byte_arr = str.getBytes();

        // Create a new string using the contents of the byte array.
        String new_str = new String(byte_arr);

        // Display the contents of the byte array.
        System.out.println("\nThe new String equals " +
            new_str + "\n");
    }
}

Sample Output:

The new String equals This is a sample String.

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to convert a string to a byte array and then display the array in hexadecimal format.
• Write a Java program to convert a string to bytes using different character encodings and compare the results.
• Write a Java program to convert a string to a byte array, then reconstruct the string from the byte array.
• Write a Java program to convert a string to a byte array and compute the checksum of the resulting array.

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Java Code Editor:

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