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Bas Leijdekkersandintellij-monorepo-bot
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38 lines
1.1 KiB
HTML
38 lines
1.1 KiB
HTML
<html>
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<body>
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Reports inner classes that can be made <code>static</code>.
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<p>
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On Java 17 and older non-static inner classes contain an implicit reference to their enclosing instance.
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Static nested classes do not have such a reference.
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Therefore, making an inner class <code>static</code> prevents a common cause of memory leaks
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and uses slightly less memory per instance of the class.
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<p>
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The implicit reference was <a href="https://www.oracle.com/java/technologies/javase/18-relnote-issues.html#JDK-8271623">removed</a>
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for non-Serializable inner classes in Java 18.
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<p><b>Example:</b></p>
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<pre><code>
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<b>public class</b> Outer {
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<b>class</b> Inner { // not static
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<b>public void</b> foo() {
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bar("x");
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}
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<b>private void</b> bar(String string) {}
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}
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}
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</code></pre>
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<p>After the quick-fix is applied:</p>
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<pre><code>
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<b>public class</b> Outer {
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<b>static class</b> Inner {
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<b>public void</b> foo() {
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bar("x");
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}
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<b>private void</b> bar(String string) {}
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}
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}
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</code></pre>
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<!-- tooltip end -->
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</html> |