In this example, We have shared difference between final and effectively final. For example, suppose that the variable numberLength is not declared final, and you add the marked assignment statement in the PhoneNumber constructor:
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public class OutterClass { int numberLength; // <== not *final* class PhoneNumber { PhoneNumber(String phoneNumber) { numberLength = 7; // <== assignment to numberLength String currentNumber = phoneNumber.replaceAll( regularExpression, ""); if (currentNumber.length() == numberLength) formattedPhoneNumber = currentNumber; else formattedPhoneNumber = null; } ... } ... } |
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