Stripping A String Of Non-Digits

[JDub2k]

Hi,

I'm having a problem with a program I'm making for a class. Basically what it does is read in a file using JFileChooser and load the level in the file. The format for the filename is "levelX.lvl" where X is the level number.

For example,
level0.lvl
level1.lvl
...
level10.lvl
level11.lvl
etc...

Now based on the number in the filename, I need to set a variable curLevel to that number. That way the game knows that it is running that level.

I know how to save the filename to a string. But how can I strip that string of everything but the numbers?

Thanks in advance.

 

[chessbot]

String filename = "level1.lvl";
String lvl = filename.split("\.")[0];
lvl = lvl.replace("level","");
int curLevel = Integer.parseInt(lvl);

I haven't tested it though...

--Chessbot

"Violence is the last refuge of the incompetent." -- Asimov, Foundation

 

[JDub2k]

I get an error using that saying:

Invalid escape sequence (valid ones are \b \t \n \f \r \" \' \\ )

Any ideas?

 

[sedj]

String lvl = filename.split("\\.")[0];

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[JDub2k]

Okay, that works for level1.lvl through level9.lvl but as soon as the levels hit double digits, for example level13.lvl, I get the following error at runtime.

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 13
at a3Solution.TileGame.fileIn(TileGame.java:240)
at a3Solution.TileGame.access$0(TileGame.java:226)
at a3Solution.TileGame$3.actionPerformed(TileGame.java:95)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

 

[sedj]

You have an array of something, which you are trying to access at subscript 13, which is causing "java.lang.ArrayIndexOutOfBoundsException: 13".

The stack trace shows that it is not part of the split() code shown above, but something else. What is the line 240 in TileGame.java doing ?


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http://www.primrose.org.uk

 

[JDub2k]

Oh thanks. I found the problem. It was just an error in my level file. Everything works fine now. Thanks again!

 

[ishnid]

Just another way to do it:

String filename = "level1.lvl";
String lvl = filename.replaceAll("\\D", "");

 

[sedj]

ishnid :

That gives an output of "1" - but the OP wanted "level1" ...

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http://www.primrose.org.uk

 

[ishnid]

OP's question was to "strip that string of everything but the numbers" and doesn't mention keeping the string "level".

 

[sedj]

Sorry, my fault, must remember to read the question better !

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http://www.primrose.org.uk