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Failing to explicitly declare the visibility of a member variable could result it in having a visibility you don't expect, and potentially leave it open to unexpected modification by other classes.

Noncompliant Code Sample
class Ball {
  String color="red";  // Noncompliant
}
enum A {
 B;
 int a;
}


Compliant Solution
class Ball {
  private String color="red";  // Compliant
}
enum A {
 B;
 private int a;
}