Let’s learn program to find area of rectangle using inheritance in java. Program to find area of rectangle using inheritance in java We can calculate area of rectangle using inheritance. Here’s an example. class RectangleDimension { int length; int breadth; } class Rectangle extends RectangleDimension { int area; void findArea() { area = length *…
Read More Program to find area of rectangle using inheritance in javaLet’s learn java program to find area of circle and rectangle using interface. Java program to find area of circle and rectangle using interface We can use interface to calculate area of circle and rectangle. Here’s java program. interface FindArea { double pi = 3.14159265359; double calculate(double a, double b); } class Rectangle implements FindArea…
Read More Java program to find area of circle and rectangle using interfaceLet’s learn java program to calculate area of circle rectangle and triangle using switch statement. Java program to calculate area of circle rectangle and triangle using switch statement We can use switch statement to calculate area of circle, rectangle and triangle. import java.util.Scanner; public class FindAreaUsingSwitchStatement { public static void main(String[] args) { Scanner sc…
Read More Java program to calculate area of circle rectangle and triangle using switchLet’s learn how do you swap two variables in java in single line? Swap two variables in java in single line In single expression we can swap two variables or two integers. To swap two variables in one line we are using bitwise xor operator. Bitwise xor operator of two numbers returns 1 if both…
Read More Swap two variables in java in single lineLet’s learn how do you swap three variables in java without using temporary variable? Swap three variables in java without using temporary variable In the below example we are using arithmetic operators to swap three variables without using temporary variable. public class SwapThreeNumbersWithoutTemp { static int num1, num2, num3; public static void main(String[] args) {…
Read More Swap three variables in java without temporary variableLet’s learn how do you make a 2D dynamic array in java? or 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…
Read More Create Dynamic 2D array in javaLet’s learn how do you sort an ArrayList in an 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…
Read More How to sort ArrayList in javaLet’s learn how do you sort in descending order in TreeSet 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…
Read More How to sort TreeSet in descending order in javaLet’s learn can we sort TreeMap by values in java? TreeMap sort by values 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…
Read More TreeMap sort by values in javaLet’s learn TreeMap comparator() method in java with examples. Treemap comparator() method in java with examples TreeMap comparator() method returns the comparator used to order the keys in this map, or null if this map uses the natural ordering of its keys. Let’s see example on TreeMap comparator() method for natural ordering. import java.util.Comparator; import…
Read More TreeMap comparator() method in java with examples