Exception handling

Exception - special conditions that change the normal flow of program execution.

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Exception hierarchy

Your exception extend Exception.

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Type of exception

• Checked exception
• Unchecked exception

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Standart checked exception

• IllegalArgumentException
• IllegalStateException
• NullPointerException
• IndexOutOfBoundsException
• ConcurentModificationException
• UnsupportedOperationException
• AritmeticException
• NumberFormatException

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Exception handle

try{
    //protected block
}catch(Datovy typ výjimky){
    //exception handling
}finally{
    //this code it execute every time
} 

Block finally it will execute always.

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Exception chaining

public void configure() throws ConfigurationException{
    try{
        ...
        ...
    }catch(FileNotFoundException e){
        throw new ConfigurationException("Config file not exists.",e);
    }catch(PropertyMissingException e){
        throw new ConfigurationException("Missing argument.",e);
    }catch(InvalidFormatException e){
        throw new ConfigurationException("Unknown argument",e);
    }
} 

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Exception mesage

public IndexOutOfBoundException( int lowerBound, int upperBound, int index){      
    super ("Lower bound:" +  lowerBound +
                ", Upper bound: " + upperBound +
                ", Index: " + index);              
    )
}

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