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TIOBE - Java Coding Standard

Rule:  Design24Checked automatically with code checker

Synopsis:Avoid protected fields in a final class. Change to private or package access
Severity Level:2

Do not use protected fields in final classes since they cannot be subclassed. Clarify your intent by using private or package access modifiers instead.
public final class Bar {
 private int x;
 protected int y;  // <-- Bar cannot be subclassed, so is y really private or package visible???
 Bar() {}