Initialize variables before use

[Java Tip]

In Java, you have to initialize a variable before use. There are no default value assigned to variables during declaration.

Code:

int age;
System.out.println(age);

Error:

Code:

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
The local variable age may not have been initialized

It’s a good programming practice to initialize variables at declaration time.

Code:

int age = 0;