CPAMBF - Constant Private Attributes Must Be Final

Private attributes that never get their values changed must be declared `final` . By explicitly declaring them in such a way, a reader of the source code get some information of how the attribute is supposed to be used.

Wrong

`class CPAMBF {
int attr1 = 10;
int attr2 = 20;
void func () {
attr1 = attr2;
System.out.println(attr1);
}
}`

Tip: Make `final` all private attributes that never change.

Right

`class CPAMBF {
int attr1 = 10;
final int attr2 = 20;
void func () {
attr1 = attr2;
System.out.println(attr1);
}
}`