3. Write the difference between throw and throws keywords used for exception handling. 4. What is exception propagation? How to handle exception in child class.
In computer programming, an exception is regarded as the runtime error that generates when the program behaves abnormally and terminates showing some messages. This may occur due to having the program wrong logic or wrong understanding of the program statement.
Answer:
Difference:
Both terms throw and throws are used in the context of exception handling. The main difference between these is that the "throw" keyword is applied where a single exception is thrown from a function or any code block explicitly and using the throws keyword, multiple exceptions can be mentioned in the function signature section.
Example:
public class ExceptionClass{
public void positiveVal(int num){
if(num<0)
throw new ArithmeticException("Invalid");
else
System.out.print("Valid input value");
}
public static void main(String args[]){
ExceptionClass obj = new ExceptionClass();
obj.positiveVal(-99);
obj.positiveVal(99);
}
}
import java.io.IOException;
public class TestClass{
public static void main(String[] args) throws IOException
{
}
}
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