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    <p>Try:</p> <pre><code> Node(K data) { this(); this.data = data; } </code></pre> <p>The call to the "other" constructor needs to be always first. The call to the other constructors from inside a constructor is always done with <code>this(...)</code> not with <code>Node(...)</code>.</p> <p><a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-8.html#jls-8.8.7" rel="nofollow">JLS section 8.8.7</a> specify how the constructor body should look like:</p> <blockquote> <p>ConstructorBody: { ExplicitConstructorInvocation(opt) BlockStatements(opt) }</p> </blockquote> <p>where <code>ExplicitConstructorInvocation(opt)</code> is either an alternate constructor or a constructor from the parent class invoked with <code>super(...)</code>.</p> <p>and <a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-12.html#jls-12.5" rel="nofollow">JLS section 12.5</a> specify the object initialization steps when a constructor is called:</p> <blockquote> <p>Just before a reference to the newly created object is returned as the result, the indicated constructor is processed to initialize the new object using the following procedure:</p> <ul> <li><p>Assign the arguments for the constructor to newly created parameter variables for this constructor invocation.</p></li> <li><p>If this constructor begins with an explicit constructor invocation (§8.8.7.1) of another constructor in the same class (using this), then evaluate the arguments and process that constructor invocation recursively using these same five steps. </p></li> </ul> <p>...</p> </blockquote> <p><strong>These JLS rules make sure that the parent class constructor is called first and once.</strong></p>
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    1. POWhy can't I call the default constructor from a parameterized constructor inside a private class?
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    1. POWhy can't I call the default constructor from a parameterized constructor inside a private class?
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    1. CO1+ but only after your edit explaining what your code was doing.
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    2. COWhy does it have to be the first ?
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    3. COThe structure of the constructor body and initialization steps at construction are defined by the java language specification. Updated the answer with references.
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