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copied!<p>You don't <strong>have</strong> to use "_", you <strong>can</strong>. And examples given in the proposal are credit card numbers, phone numbers, or simply numbers for which it makes sense to have a separator in the code.</p> <p>For the "In positions where a string of digits is expected" it's simply in places where it's supposed to start (or end) with a digit. Here are some examples.</p> <blockquote> <p>Note that according to this proposal, underscores can only be placed between digits. They cannot be placed by themselves in positions where a string of digits would normally be expected:</p> <p>int x1 = _52; // This is an identifier, not a numeric literal.</p> <p>int x2 = 5_2; // OK. (Decimal literal)</p> <p>int x2 = 52_; // Illegal. (Underscores must always be between digits)</p> <p>int x3 = 5_______2; // OK. (Decimal literal.)</p> <p>int x4 = 0_x52; // Illegal. Can't put underscores in the "0x" radix prefix.</p> <p>int x5 = 0x_52; // Illegal. (Underscores must always be between digits)</p> <p>int x6 = 0x5_2; // OK. (Hexadecimal literal)</p> <p>int x6 = 0x52_; // Illegal. (Underscores must always be between digits)</p> <p>int x6 = 0x_; // Illegal. (Not valid with the underscore removed)</p> <p>int x7 = 0_52; // OK. (Octal literal)</p> <p>int x7 = 05_2; // OK. (Octal literal)</p> <p>int x8 = 052_; // Illegal. (Underscores must always be between digits)</p> </blockquote> <hr> <p><strong>Resources:</strong></p> <ul> <li><a href="http://mail.openjdk.java.net/pipermail/coin-dev/2009-April/001628.html" rel="noreferrer">OpenJDK - Project Coin - PROPOSAL: Underscores in Numbers (Version 2)</a></li> <li><a href="http://blogs.oracle.com/darcy/entry/project_coin_literal_grammar_hackery" rel="noreferrer">Joe Darcy's blog - Project Coin: Project Coin: Literal Grammar Hackery</a></li> </ul>

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