java interview Questions
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java interview questions for beginners Any promotion for rajp6133@gmail.com
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доля реакций к просмотрам- 10 мар.'==' 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.0,25%
- 10 мар.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.0,25%
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- 4 янв.import java.util.Arrays; import java.util.LinkedHashSet; public class ArrayExample { public static void main(String[] args) throws CloneNotSupportedException { //Array with duplicate elements Integer[] numbers = new Integer[] {1,2,3,4,5,1,3,5}; //This array has duplicate elements System.out.println( Arrays.toString(numbers) ); //Create set from array elements LinkedHashSet<Integer> linkedHashSet = new LinkedHashSet<>( Arrays.asList(numbers) ); //Get back the array without duplicates Integer[] numbersWithoutDuplicates = linkedHashSet.toArray(new Integer[] {}); //Verify the array content System.out.println( Arrays.toString(numbersWithoutDuplicates) ); } }0,14%
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