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Why is this an issue?
The requirement for a final default clause is defensive programming. The clause should either take appropriate action, or contain a
suitable comment as to why no action is taken.
Noncompliant code example
switch (param) { // Noncompliant - default clause is missing
  case 0:
    doSomething();
    break;
  case 1:
    doSomethingElse();
    break;
}

switch (param) {
  default: // Noncompliant - default clause should be the last one
    doSomething();
    break;
  case 0:
    doSomethingElse();
    break;
}

Compliant solution
switch (param) {
  case 0:
    doSomethingElse();
    break;
  default:
    doSomethingElse();
    break;
}

Resources

   CWE - CWE-478 - Missing Default Case in Switch Statement