Extending class with generic parameter

Question

I need to derive from the following class:

public abstract class MyTool<VIEW extends MyView>
  implements LookupListener, MouseListener, MouseMotionListener, KeyListener {}

The following does not work:

public abstract class MySubTool<VIEW> extends MyTool<VIEW> {}

Thanks !

Vivien Barousse · Accepted Answer · 2011-05-23 10:28:55Z

3

The compiler in MySubTool as no way of knowing that VIEW in MySubTool is a subclass of MyView, you have to specify it again:

public abstract class MySubTool<VIEW extends MyView> extends MyTool<VIEW> {}

answered May 23, 2011 at 10:28

Vivien Barousse

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3 Comments

malat Over a year ago

Here is what the compiler reports: cannot find symbol symbol : constructor MyView() location: class com.mysystem.viewer.MyView<VIEW> public MySubTool() {

Vivien Barousse Over a year ago

This is unrelated to your previous problem, which was about generics. Your new problems is about constructors. Your base class has no default constructors, so you have to specify in MySubTool which constructor you want to call using super.

malat Over a year ago

oops sorry for the noise. Thanks for your great help !

Buhake Sindi · Accepted Answer · 2011-05-23 10:29:29Z

1

This should:

public abstract class MySubTool<VIEW extends MyView> extends MyTool<VIEW> {}

answered May 23, 2011 at 10:29

Buhake Sindi

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