if throw error java code example

Example 1: java how to throw exception

public class ThrowException{
  public static void main(String [] args) throws Exception{ 
    //throws Exception line is needed if not using try-catch block
    throw new Exception("Errmessage");
  }
}

Example 2: java return exception

void testMethod() throws ArithmeticException, ArrayIndexOutOfBoundsException {
    // rest of code
}