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POIs there a good reason why you can or cannot have an inner interface within a Java class?
 

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  1. POIs there a good reason why you can or cannot have an inner interface within a Java class?
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    <p>Is there a good reason why you can or cannot have an inner interface within a Java class? (like you would an inner class). I couldn't find a definitive answer with Google, but it appears as though you can't embed an interface the same way you would with an inner class. My guess is that the Java creators didn't see a great reason to make it possible, and so it isn't but maybe there are really good reasons?</p> <p>for example I can't get this to compile (it's all one big class)</p> <pre><code>package buttonGetSourceObject; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class ClassWithButton implements ActionListener, ButtonOwner{ private String objectName = ""; public ClassWithButton(String string) { objectName = string; JFrame f = new JFrame(); JPanel p = new JPanel(); MyJButton b = new MyJButton(this,"Press This Button for Name of Owner of Button"); b.addActionListener(this); f.add(p); p.add(b); f.pack(); f.setVisible(true); } public static void main(String[] args){ ClassWithButton c = new ClassWithButton("object1name"); } @Override public void actionPerformed(ActionEvent arg0) { ((ButtonOwner)((MyJButton)arg0.getSource()).getOwner()).printInstanceName(); } public interface ButtonOwner { public void printInstanceName(); } private class MyJButton extends JButton { /** * */ private static final long serialVersionUID = 1L; Object owner = null; public Object getOwner() { return owner; } public void setOwner(Object owner) { this.owner = owner; } public MyJButton(Object o, String string){ owner = o; this.setText(string); } } @Override public void printInstanceName() { System.out.println(this); } public String getObjectName() { return objectName; } public void setObjectName(String objectName) { this.objectName = objectName; } public String toString(){ return this.getObjectName(); } } //end </code></pre> <p>the compiler doesn't seem to recognize the inner Interface "ButtonOwner" as existing at all</p>
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    1. USAlexander Mills
    1. USAlexander Mills
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    1. COWhat aspect of nesting interfaces did you find was impossible (that happened to be _possible_ with nested classes)?
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      1. POIs there a good reason why you can or cannot have an inner interface within a Java class?
      1. USRay Toal
    2. COYou can have inner interfaces (interfaces inside of classes). Do you mean interfaces inside of interfaces?
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      1. USFriendlyGuy
    3. COI am pretty sure my IDE (Eclipse Juno) barfed when I tried to do it. Also, I couldn't find any evidence on google that supported the belief that you could nest interfaces (or not, either, no evidence either way).
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