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    <p>Tokens are the individual characters and strings which have some kind of meaning.</p> <p>Tokens, as defined in <a href="http://java.sun.com/docs/books/jls/second_edition/html/lexical.doc.html" rel="noreferrer">Chapter 3: Lexical Structure</a> of <a href="http://java.sun.com/docs/books/jls/third_edition/html/j3TOC.html" rel="noreferrer">The Java Language Specification</a>, are:</p> <blockquote> <p>identifiers (§3.8), keywords (§3.9), literals (§3.10), separators (§3.11), and operators (§3.12) of the syntactic grammar.</p> </blockquote> <p>The tokens in the given line are:</p> <pre><code>"(", "fitness", "&gt;", "g.fitness", ")", "?", "return", "1", ":", "return", "-1", ";" </code></pre> <p>(Whitespace also counts, but I've omitted them from the above.)</p> <hr> <p>Labels in Java are used for control of flow in a program, and is an identifier, followed by a colon.</p> <p>An example of a label would be <code>hello:</code>.</p> <p>Labels are used in conjunction with <code>continue</code> and <code>break</code> statements, to specify which control structure to <code>continue</code> or <code>break</code> to.</p> <p>There is more information on Labeled Statements in <a href="http://java.sun.com/docs/books/jls/third_edition/html/statements.html#14.7" rel="noreferrer">Section 14.7</a> of <a href="http://java.sun.com/docs/books/jls/third_edition/html/j3TOC.html" rel="noreferrer">The Java Language Specification</a>.</p> <hr> <p>The problem here is with the <code>return</code> statement:</p> <pre><code>(fitness&gt;g.fitness) ? return 1 : return -1; ^^^^^^ </code></pre> <p>There is a <code>:</code> immediately following the <code>return 1</code>, which makes the compiler think that there is supposed to be a label there. </p> <p>However, the <code>return 1</code> is a statement in itself, therefore, there is no label identifier there, so the compiler is complaining that it was expecting an label, but it was not able to find a properly formed label.</p> <pre><code>(fitness&gt;g.fitness) ? return 1 : return -1; ^^^^^^^^ ^ statement label without an identifier </code></pre>
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