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According to §6.4.2, "Obscuring," of the Java Language Specification [JLS 2011],

A simple name may occur in contexts where it may potentially be interpreted as the name of a variable, a type, or a package. In these situations, the rules of §6.5 specify that a variable will be chosen in preference to a type, and that a type will be chosen in preference to a package.

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This compliant solution eliminates shadowing by changing the name of the variable defined in the method scope.:

class MyVector {
  private int val = 1;
  private void doLogic() {
    int newValue;
    //...   
  }
}

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This example is noncompliant because the variable i defined in the scope of the second for loop block shadows the definition of i defined in the scope of the doLogic() method.:

class MyVector {
  private int i = 0;
  private void doLogic() {
    for (i = 0; i < 10; i++) {/* ... */}
    for (int i = 0; i < 20; i++) {/* ... */} 
  }
}

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In this compliant solution, the loop counter i is defined in the scope of each for loop block.:

class MyVector {
  private void doLogic() {
    for (int i = 0; i < 10; i++) {/* ... */}
    for (int i = 0; i < 20; i++) {/* ... */} 
  }
}

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