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    <p>Use the <code>toInteger()</code> method to convert a <code>String</code> to an <code>Integer</code>, e.g.</p> <pre><code>int value = "99".toInteger() </code></pre> <p>An alternative, which avoids using a deprecated method (see below) is</p> <pre><code>int value = "66" as Integer </code></pre> <p>If you need to check whether the <code>String</code> <em>can</em> be converted before performing the conversion, use </p> <pre><code>String number = "66" if (number.isInteger()) { int value = number as Integer } </code></pre> <h2>Grails</h2> <p>If you're converting a request parameter in a Grails controller, there's an even better way</p> <pre><code>Integer paramValue = params.int('paramName') </code></pre> <p>One of the nice features of this technique is that it's safe, i.e. if the parameter cannot be converted to an <code>Integer</code> it returns null rather than throwing an exception.</p> <h2>Deprecation Update</h2> <p>In recent versions of Groovy one of the <code>toInteger()</code> methods has been deprecated. The following is taken from <code>org.codehaus.groovy.runtime.StringGroovyMethods</code> in Groovy 2.4.4</p> <pre><code>/** * Parse a CharSequence into an Integer * * @param self a CharSequence * @return an Integer * @since 1.8.2 */ public static Integer toInteger(CharSequence self) { return Integer.valueOf(self.toString().trim()); } /** * @deprecated Use the CharSequence version * @see #toInteger(CharSequence) */ @Deprecated public static Integer toInteger(String self) { return toInteger((CharSequence) self); } </code></pre> <p>You can force the non-deprecated version of the method to be called using something awful like:</p> <pre><code>int num = ((CharSequence) "66").toInteger() </code></pre> <p>Personally, I much prefer:</p> <pre><code>int num = 66 as Integer </code></pre>
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    1. COSeconded and thirded.
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      1. USElectrons_Ahoy
    2. COCaveat emptor: you need to check the value with `isInteger()` first, because `toInteger()` will throw an exception if the string is not numeric. Same applies to `toFloat()`/`isFloat()`
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      1. USAndres Kievsky
    3. COIn the [2.1.6 api documentation](http://groovy.codehaus.org/gapi/org/codehaus/groovy/runtime/DefaultGroovyMethods.html) isInteger/toInteger are deprecated. What is the current best way to do this then?
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