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copied!<p>According to the Java Spec (<a href="https://docs.oracle.com/javase/specs/jls/se8/html/jls-6.html#jls-6.6.2.2" rel="noreferrer">https://docs.oracle.com/javase/specs/jls/se8/html/jls-6.html#jls-6.6.2.2</a>)</p> <blockquote> <h3>6.6.2.2. Qualified Access to a <code>protected</code> Constructor</h3> <p>Let <code>C</code> be the class in which a <code>protected</code> constructor is declared and let <code>S</code> be the innermost class in whose declaration the use of the <code>protected</code> constructor occurs. Then:</p> <ul> <li><p>If the access is by a superclass constructor invocation <code>super(...)</code>, or a qualified superclass constructor invocation <code>E.super(...)</code>, where <code>E</code> is a <em>Primary</em> expression, then the access is permitted.</p></li> <li><p>If the access is by an anonymous class instance creation expression <code>new C(...){...}</code>, or a qualified anonymous class instance creation expression <code>E.new C(...){...}</code>, where <code>E</code> is a <em>Primary</em> expression, then the access is permitted.</p></li> <li><p><strong>If the access is by a simple class instance creation expression <code>new C(...)</code>, or a qualified class instance creation expression <code>E.new C(...)</code>, where <code>E</code> is a <em>Primary</em> expression, or a method reference expression <code>C :: new</code>, where <code>C</code> is a <em>ClassType</em>, then the access is not permitted.</strong> A <code>protected</code> constructor can be accessed by a class instance creation expression (that does not declare an anonymous class) or a method reference expression only from within the package in which it is defined.</p></li> </ul> </blockquote> <p>In your case, access to the protected constructor of <code>A</code> from <code>B</code> would be legal from a constructor of <code>B</code> through an invocation of <code>super()</code>. However, access using <code>new</code> is not legal.</p>

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