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Defining Exception Classes

• Decide exception should be checked
• Subclass Exception or RuntimeException
• Provide two constructors
  

  public class IllegalFormatException extends Exception
  
  {
  
     public IllegalFormatException() {}
  
     public IllegalFormatException(String reason)
  
     { super(reason); }
  
  }
  

• Throw exception when needed:
  throw new IllegalFormatException("number expected");
  

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