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

Java String: Exercise-16 with Solution

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

Sample Solution:

Java Code:

import java.util.Calendar;

public class Exercise16 {
 
  public static void main(String[] args)
    {
        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:

Flowchart: Java String Exercises - Get the contents of a given string as a byte array

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Java Code Editor:

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Previous: Write a java program to print current date and time in the specified format.
Next: Write a Java program to get the contents of a given string as a character array.

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Java: Tips of the Day

Array vs ArrayLists:

The main difference between these two is that an Array is of fixed size so once you have created an Array you cannot change it but the ArrayList is not of fixed size. You can create instances of ArrayLists without specifying its size. So if you create such instances of an ArrayList without specifying its size Java will create an instance of an ArrayList of default size.

Once an ArrayList is full it re-sizes itself. In fact, an ArrayList is internally supported by an array. So when an ArrayList is resized it will slow down its performance a bit as the contents of the old Array must be copied to a new Array.

At the same time, it's compulsory to specify the size of an Array directly or indirectly while creating it. And also Arrays can store both primitives and objects while ArrayLists only can store objects.

Ref: https://bit.ly/3o8L2KH