Missing value in Java

Question

What is the statement that can be used in Java to represent a missing value of a variable. for instance I want to write a code:

if (a>=23)
 income = pay_rate;         


        

Answer 1

You are looking for a value, not for a statement, and that value is null. You cannot assign null to variables of primitive data types, such as int and double, but you can use it with their boxed counterparts -- Integer, Double, et cetera.

When you do that, you should be careful to check your values for null before accessing them. Otherwise, an innocent-looking if (pay_rate > 100) may throw a null reference exception.