Java throws

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The throws keyword is mainly used to declare an exception.

 

When a method is not able to handle a checked exception, then the method should use the throws keyword.

 

The throws keyword appears with the method's signature.

Syntax:

 Datatype MethodName() throws ExceptionName{  
// Method implementation
}

Example

public class ThrowsException
{ 
    static void age() throws IllegalAccessException 
    { 
        int a=12;
        if(a>18)
        {
            System.out.println("Right to vote"); 
        }
        else{
            throw new IllegalAccessException("Not eligible");
        }
        
    } 
    public static void main(String args[]) 
    { 
        try
        { 
            age(); 
        } 
        catch(IllegalAccessException e) 
        { 
            System.out.println("Exception handled"); 
        } 
    } 
}
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Difference between throw and throws.

S.No throw throws
1 The 'throw' keyword is used to invoke an exception explicitly. The 'throws' keyword is mainly used to declare an exception.
2 The throw should be used within the method. The throws keyword appears with the method's signature.
3 Throw is followed by an instance of exception class. Throws is followed by exception class name.
4 You can throw only one exception at a time. You can declare multiple exceptions at a time. e.g. public MethodName() throws Exception 1, Exception 2.
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