Let’s learn immutable class in java. Immutable class in java An immutable object in one that once the object is created its state or content cannot be modified. For example: string is immutable in java. Click here to know why. Also all wrapper classes namely Boolean, Byte, Short, Integer, Long, Float, Double etc are immutable.…
Read More Immutable class in javaLet’s learn wrapper class in java. Wrapper classes in java Wrapper classes allow primitive data types a way to convert into object and vice-versa. For example: int a = 7; // using primitive datatype Integer a = new Integer(7); // using wrapper class Since Java 1.0 wrapper class is been there and from Java version…
Read More Wrapper classes in javaLet’s learn random class in java. random class in java An instance of Random class is used to generate a stream of pseudorandom numbers. Instances of java.util.Random are not cryptographically secure. Instances of java.util.Random are threadsafe. However, the concurrent use of the same java.util.Random instance across threads may encounter contention and consequent poor performance. random…
Read More random class in javaLet’s learn difference between abstract class and interface in java. Difference between abstract class and interface in java Here’s the difference between abstract class and interface. abstract class interface an abstract class can have protected, private etc. as access modifiers for class members. members of interface are public by default. abstract class can have static,…
Read More Difference between abstract class and interface in javaLet’s learn difference between class and interface in java. Difference between class and interface in java Here’s the difference between class and interface. class interface “class” keyword is used to declare class. whereas “interface” keyword is used to declare an interface. multiple inheritance is not supported in a class whereas interface supports multiple inheritance. A…
Read More Difference between class and interface in javaLet’s learn difference between hashmap and hashset in java. Difference between HashMap and HashSet in java HashSet HashMap HashSet stores only objects. HashMap stores elements in key and value pairs. That is each element has its corresponding key which is used for retrieval during iteration. insertion order is not preserved. objects inserted are based on…
Read More Difference between HashMap and HashSet in javaLet’s learn recursion in java. Recursion in java Recursion is a process where a method calls itself infinitely or continuously. Recursion program Recursion makes code closely packed and difficult to understand. Here’s an example on infinite recursive function. public class InfiniteRecursiveExample { static void print() { System.out.println(“helloworld”); print(); } public static void main(String[] args) {…
Read More Recursion in javaLet’s learn getter and setter in java. Getter and Setter in java get and set methods are basically used in Encapsulation. Encapsulation means hiding sensitive date from user. To hide sensitive data from user we have to declare class variables as private. We all know private variables in a class can only be accessed within…
Read More Getter and Setter in javaLet’s learn how to remove duplicates from arraylist in java. How to remove duplicates from ArrayList in java Here the task is to remove duplicates in Arraylist. In the below java program first get given ArrayList with duplicate integer values. Now print ArrayList with duplicate integer values on the console. Create another ArrayList ‘alNew’. Pass…
Read More How to remove duplicates from ArrayList in javaLet’s learn how to remove duplicates from array in java without using collections. How to remove duplicates from array in java without using collections To remove duplicates from array is bit tricky. Because problem with arrays is not finding duplicates, its about removing duplicates. We all know that an array is a static data structure…
Read More How to remove duplicates from array in java without using collections