How Many Bytes Does a Java String Occupy in Memory?

Calculating the Number of Bytes in a Java String

In Java, a string is a collection of characters that occupy a specific number of bytes in memory. The number of bytes depends on the encoding used to represent the string.

To determine the number of bytes in a string, you can use the getBytes() method, which converts the string into a byte array. The size of the byte array corresponds to the number of bytes in the string.

For example:

<code class="java">String s = "Hello World";
byte[] bytes = s.getBytes("UTF-8");
int numBytes = bytes.length;</code>

In this example, the string "Hello World" is converted to a byte array using the UTF-8 encoding. The length of the byte array (numBytes) will be the number of bytes in the string.

It's important to note that the number of bytes in a string can vary depending on the encoding used. For instance, the following will demonstrate the differences in byte count for the same string using different encodings:

<code class="java">byte[] utf8Bytes = s.getBytes("UTF-8");
byte[] utf16Bytes = s.getBytes("UTF-16");
byte[] utf32Bytes = s.getBytes("UTF-32");</code>

The byte count for each encoding will be printed out, showing how the representation of the string in terms of bytes changes with different character sets.

Therefore, when working with strings, it's essential to consider the encoding used when determining the number of bytes.

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