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Bas Leijdekkersandintellij-monorepo-bot
e3c1a47479
GitOrigin-RevId: 6f2ede99c0778fd1383478c0f75ce207bcf38a53
38 lines
1.9 KiB
HTML
38 lines
1.9 KiB
HTML
<html>
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<body>
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Reports expressions and conditions that always produce the same result,
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like <code>true</code>, <code>false</code>, <code>null</code>, or <code>0</code>.
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Such expressions can be replaced with the corresponding constant value, or may indicate there is a bug in the code.
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<p>Examples:</p>
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<pre><code> // always true
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// cause: || is used instead of &&
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if (x > 0 || x < 10) {}
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System.out.println(str.trim());
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// always false
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// cause: variable was dereferenced before null-check
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if (str == null) {}
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</code></pre>
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<p>
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The inspection's behavior may be controlled by annotations, such as
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<a href="https://www.jetbrains.com/help/idea/nullable-and-notnull-annotations.html">nullability</a> annotations,
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<code><a href="https://www.jetbrains.com/help/idea/contract-annotations.html">@Contract</a></code> annotation,
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<code>@Range</code> annotation and so on.
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</p>
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<!-- tooltip end -->
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<p>Configure the inspection:</p>
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<ul>
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<li>Use the <b>Don't report assertions with condition statically proven to be always true</b> option to avoid reporting assertions that were
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statically proven to be always true. This includes conditions like <code>if (alwaysFalseCondition) throw new IllegalArgumentException();</code>.</li>
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<li>Use the <b>Ignore assert statements</b> option to control how the inspection treats <code>assert</code> statements.
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By default, assertions are assumed to be executed (<code>-ea</code> mode).
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When the option is enabled, assertions will be ignored (<code>-da</code> mode).</li>
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<li>Use the <b>Warn when constant is stored in variable</b> option to display warnings when a variable is used, whose value is known to be constant.</li>
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</ul>
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<p>
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Before IntelliJ IDEA 2022.3, this inspection was part of the <i>Constant Conditions & Exceptions</i> inspection.
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This inspection has been split into two inspections: <i>Constant Values</i> and <i>Nullability and data flow problems</i>.
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</p>
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</body>
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</html>
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