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java.lang.ClassCastException: javax.swing.KeyStroke cannot be cast to java.lang.Comparable

annapoorna chitturi
Greenhorn

Joined: Jul 03, 2012
Posts: 1
The SWING frame work that i am using is working fine with jre1.6.When i try to run it through jre1.7 getting the below exception .

java.lang.ClassCastException: javax.swing.KeyStroke cannot be cast to java.lang.Comparable
at java.util.TreeMap.compare(Unknown Source)
at java.util.TreeMap.put(Unknown Source)
at java.util.TreeSet.add(Unknown Source)

Can any one help to reslove this ..
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 38513
    
  23
Welcome to the Ranch

You know that a class cast can only cast an object to a type that it already is. If you look up KeyStroke, you find it doesn’t implement Comparable. I can tell that without looking in the API from the exception message you quoted. You may be able to sort by using the getKeyChar or getKeyCode methods, but I don’t know. You might have to use those methods inside the compare() method of a Comparator<KeyStroke>.
Darryl Burke
Bartender

Joined: May 03, 2008
Posts: 4531
    
    5

It might help if you explain why, when you want to map KeyStrokes, you choose to use TreeMap and not some other Map implementation.

Also, I can't see where the Java version should make a difference. Can you post the code that you say works in Java SE 6 but fails in 7, in the form of an SSCCE?


luck, db
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subject: java.lang.ClassCastException: javax.swing.KeyStroke cannot be cast to java.lang.Comparable