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    <p>I dunno. Let's go see:</p> <ul> <li><a href="http://www.docjar.com/html/api/java/lang/StringBuilder.java.html" rel="noreferrer">http://www.docjar.com/html/api/java/lang/StringBuilder.java.html</a></li> </ul> <blockquote> <pre><code>72 public final class StringBuilder 73 extends AbstractStringBuilder </code></pre> </blockquote> <ul> <li><a href="http://www.docjar.com/html/api/java/lang/AbstractStringBuilder.java.html" rel="noreferrer">http://www.docjar.com/html/api/java/lang/AbstractStringBuilder.java.html</a></li> </ul> <blockquote> <pre><code>45 * The value is used for character storage. 46 */ 47 char[] value; 48 49 /** 50 * The count is the number of characters used. 51 */ 52 int count; </code></pre> </blockquote> <p>===</p> <blockquote> <p>Is StringBuilder an array of characters too?</p> </blockquote> <p>Apparently, in this particular implementation.</p> <blockquote> <p>So, I have a StringBuilder MY_OBJ= "Hello". Now if i try to append characters to the end of MY_OBJ, does it not mean that you are actually creating a new array object and copying all these chars into a new one? </p> </blockquote> <p>Not necessarily. The array isn't necessarily full (<code>count &lt; value.length</code>), so a new array may not need to be allocated. Ideally, you initialized StringBuilder a capacity so that large enough array was allocated from the start.</p> <pre><code>StringBuilder sb = new StringBuilder(20); sb.append("Hello"); ... sb.append(" there"); </code></pre> <blockquote> <p>And another question I have in mind is, how does one mark the end of a StringBuilder? Like in C, we use a "/0"</p> </blockquote> <p>You don't care - <code>String/StringBuilder</code> will handle it internally.</p>
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    1. CO+1 for pointing out that the source is available for anyone to go and look for themselves.
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      1. USPaul Bellora
 

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