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java interview Questions: post #238 — TG.ME

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June 4, 2025 6.1K

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Wrapper classes: Why they matter ? Wrapper classes convert primitives (int, boolean, etc.) into objects. You need them because: • Collections like ArrayList only store objects, not primitives. • They provide utility methods for type conversions. • They let you use primitives where objects are required. Each primitive has its wrapper: int → Integer, double → Double, char → Character, and so on. 2.1K·Mar 10 '==' vs '.equals()': A common interview trap This distinction catches many freshers off guard. For primitive types, == performs value comparison. But for objects, it only checks if two references point to the same memory address. To compare object values properly, use .equals(), many classes override this method to provide meaningful comparisons. 2.1K·Mar 10 When to use map and flatMap? map(): It is used where we have to map the elements of a particular collection to a specific function, and then we need to return the stream that contains the updated results. Example: Multiply all the elements of a list by 3 and return the updated list. flatMap(): It is used where we have to transform or flatten the string, as we can't flatten our string using map(). Example: Get the first Character of all the String present in a List of Strings and return the result in form of a stream. 3.1K·Jan 17 What is Functional Interface in Java 8? An interface with only one abstract method is known as a functional interface but there is no restriction, in a functional interface you can have n number of default methods and static methods. 2.9K·Jan 17 -------Date/Time API-------- This section gives you to handle the ever-changing world of dates and times within your Java programs. Explore working with calendars, timestamps and time manipulation – essential skills for building applications that deal with deadlines, scheduling or even historical data analysis. 2.8K·Jan 17

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