Java Throw vs Throws
The Throw Keyword:
The throw keyword is used to throw an exception explicitly by the programmer
if ( b===0 ) {
throw new ArithmeticException("Div by 0");
}
else{
return a/b ;
}In a similar manner, we can throw user defined exceptions:
throw new My Exception ( "Exception throw" );The throw Keyword
Throws java throws keyword is used to declare an exception.
This gives an information to the programmer that there might be an exception so its better to be prepared with a try catch block!
public void calculate (int a, int b) throws IOException {
// code
}package com.company;
class NegativeRadiusException extends Exception{
@Override
public String toString() {
return "Radius cannot be negative!";
}
@Override
public String getMessage() {
return "Radius cannot be negative!";
}
}
public class throw_throws {
public static double area(int r) throws NegativeRadiusException{
if (r<0){
throw new NegativeRadiusException();
}
double result = Math.PI * r * r;
return result;
}
public static int divide(int a, int b) throws ArithmeticException{
// Made By Harry
int result = a/b;
return result;
}
public static void main(String[] args) {
// Shivam - uses divide function created by Harry
try{
// int c = divide(6, 0);
// System.out.println(c);
double ar = area(6);
System.out.println(ar);
}
catch(Exception e){
System.out.println("Exception");
}
}
}