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…
Read More difference between while and do while loop in javaLet’s learn java do while loop with user input. java do while loop with user input Now let’s learn to add user input numbers and get total using do while loop. In the below program if user inputs 0, do while loop terminates the loop and finally prints the total of user input values. Here’s…
Read More java do while loop with user inputLet’s learn how to remove last element from arraylist in java. How to remove last element from ArrayList in java To remove last element from arraylist use two overloaded remove() method of ArrayList. They are, remove(int index): accepts the index of the element to be removed. Pass index of last element to delete last element.…
Read More How to remove last element from ArrayList in javaLet’s learn to create dynamic 2D array in java. Create dynamic 2D array in java Dynamic two dimensional array is one array where user can add and remove rows and columns on need and can have varying number of rows and columns. To implement dynamic two dimensional array we use a combination of List(can shrink…
Read More Create Dynamic 2D array in javaLet’s learn how to convert string to date in Java 8. How to convert string to date in Java 8 Let’s see example in converting String to Date in Java 8 using LocalDate class and DateTimeFormatter class. Syntax: LocalDate ld = LocalDate.parse(date, formatter); parse() method returns the parsed local date, not null. Let’s see an…
Read More How to convert string to date in Java 8Let’s learn how to sort ArrayList in java. How to sort ArrayList in java In java, ArrayList or LinkedList class objects are stored in unordered way. So to sort an ArrayList we are using Collections.sort() and reverseOrder() method. In this post we are going to sort arraylist in java in ascending and descending order. Collections.sort()…
Read More How to sort ArrayList in javaLet’s learn difference between HashSet and TreeSet in java. Difference between hashset and treeset in java HashSet TreeSet hashset do not maintain any order. sorted according to natural order. If not use compareTo() method. uses equals() method for comparison. uses compareTo() method for ordering two objects. hashset is implemented using HashTable. TreeSet is implemented using…
Read More Difference between HashSet and TreeSet in javaLet’s learn how to sort treeset in descending order in java. How to sort TreeSet in descending order in java In this post lets sort TreeSet elements in descending order or decreasing order. For this we are using descendingSet() method. This method returns a reverse order view of the elements contained in this set. import…
Read More How to sort TreeSet in descending order in javaLet’s learn iterate treemap in java. iterate treemap in java We cannot iterate TreeMap using iterators since TreeMap is not a collection. To iterate TreeMap use entrySet() method of TreeMap class. entrySet() method returns a Set view of the mappings contained in this map. We can iterate over key-value pair using getKey() method and getValue()…
Read More Iterate TreeMap in javaLet’s learn TreeMap sort by value in java. TreeMap sort by value in java TreeMap stores key-value pairs which are in sorted order based on key. To sort a treemap by value we have to build some logic using comparator class. Here’s an example on how to sort a treemap by value. import java.util.Comparator; import…
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