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openide/java/java-impl/resources/inspectionDescriptions/AssignmentToSuperclassField.html
2025-02-05 04:43:28 +00:00

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Reports assignment to, or modification of fields that are declared in a superclass from within a subclass constructor.
<p>It is considered preferable to initialize the fields of a superclass in its own constructor and
delegate to that constructor in a subclass. This will also allow declaring a field <code>final</code>
if it isn't changed after the construction.</p>
<p><b>Example:</b></p>
<pre><code>
class Super {
int x;
}
class Sub extends Super {
Sub(int _x) {
// Warning: x is declared in a superclass
x = _x;
}
}
</code></pre>
<p>To avoid the problem, declare a superclass constructor:</p>
<pre><code>
class Super {
final int x;
Super(int _x) {
x = _x;
}
}
class Sub extends Super {
Sub(int _x) {
super(_x);
}
}
</code></pre>
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