Let’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…

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Let’s learn recursion in java. recursion in java recursion is a process where a method calls itself infinitely or endlessly. recursion program in java recursion makes a java code closely packed. 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) {…

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Let’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…

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Let’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…

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Let’s learn difference between while and do while loop in java. difference between while and do while loop in java while loop do while loop In while loop condition is checked first and then statements are executed. In do while loop statements are executed atleast once and then condition is checked. In while loop statements…

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Let’s learn java program to add two numbers using bufferedreader. Java program to add two numbers using bufferedreader In the below program to add two numbers using bufferedreader first get input from user using readLine() method of BufferedReader class. In the next step convert string to integer using Integer.parseInt() method. This method returns the integer…

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Let’s learn string palindrome in java using stringbuffer. String palindrome in java using stringbuffer Let’s learn to find if a string is a palindrome using StringBuffer. First we have to create StringBuffer object ‘sb’. Then pass given string as parameter to the constructor. Now reverse contents of given string using reverse() method of StringBuffer class.…

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