The application gets a double value from the database. Database has and allows "null" values for a double type variable but in my java code I can't assign null values to the variable type double. double var1 = null; -- this throws an error Double var2 = null; -- no error thrown here reason: double is a primitive datatype and thus can't initialize it to a null but we can assign a null to Double as it takes the input as an object which encapsulates a primitive datatype. its like a wrapper to the primitive datatype thus can be initiated to null we can read the null value into our code as double var1 = resultset.getDouble(columnIndex); if the column has null it will return a zero thus saving your variable from the null pointer exception!
Being in the industry for almost two decades, one thing that's been constant is change and my curiosity. I In this fast world of IT...being curious, learning and learning by doing is quintessential :) Here is my way of learning and sharing what I learnt!!! Author: Sirisha Reddy G V