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Java Program to Convert Map (HashMap) to List In this program, you’ll learn different techniques to convert a map to a list in Java. Example 1: Convert Map to List import java.util.*; public class MapList { public static void main(String[] args) { Map<Integer, String> map = new HashMap<>(); map.put(1, “a”); map.put(2, “b”); map.put(3, “c”); map.put(4,…
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Java Program to Get Current Working Directory In this program, you’ll learn to get the current working directory in Java. Example 1: Get current working directory public class CurrDirectory { public static void main(String[] args) { String path = System.getProperty(“user.dir”); System.out.println(“Working Directory = ” + path); } } When you run the program, the output…
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Java Program to Convert List (ArrayList) to Array and Vice-Versa In this program, you’ll learn to convert a list to an array using toArray() and array to list using asList() in Java. Example 1: Convert list to array import java.util.ArrayList; import java.util.Arrays; import java.util.List; public class ListArray { public static void main(String[] args) { List<String>…
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Java Program to Join Two Lists In this program, you’ll learn different techniques to join two lists in Java. Example 1: Join Two Lists using addAll() import java.util.ArrayList; import java.util.List; public class JoinLists { public static void main(String[] args) { List<String> list1 = new ArrayList<String>(); list1.add(“a”); List<String> list2 = new ArrayList<String>(); list2.add(“b”); List<String> joined =…
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Java Program to Add Two Dates In this program, you’ll learn to add two dates in Java using Calendar. Since, Java epoch is 1970, any time represented in a Date object will not work. This means, your Dates will start from 1970 and when two Date objects are added, the sum misses by about 1970…
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Java Program to Convert Milliseconds to Minutes and Seconds In the above program, you’ll learn to convert milliseconds to minutes and seconds individually, and together in Java. Example 1: Convert milliseconds to minutes and seconds individually import java.util.concurrent.TimeUnit; public class Milliseconds { public static void main(String[] args) { long milliseconds = 1000000; // long minutes…
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Java Program to Get Current Date/TIme In this program, you’ll learn to get the current date and time in different formats in Java.   Example 1: Get Current date and time in default format import java.time.LocalDateTime; public class CurrentDateTime { public static void main(String[] args) { LocalDateTime current = LocalDateTime.now(); System.out.println(“Current Date and Time is:…
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Java Program to Check if a String is Empty or Null In this program, you’ll learn to check if a string is empty or null using if-else statement and functions in Java. Example 1: Check if String is Empty or Null public class Null { public static void main(String[] args) { String str1 = null;…
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Java Program to Check if An Array Contains a Given Value In this program, you’ll learn to check if an array contains a given value in Java. Example 1: Check if Int Array contains a given value public class Contains { public static void main(String[] args) { int[] num = {1, 2, 3, 4, 5};…
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Java Program to Convert Character to String and Vice-Versa In this program, you’ll learn to convert a character (char) to a string and vice-versa in Java. Example 1: Convert char to String public class CharString { public static void main(String[] args) { char ch = ‘c’; String st = Character.toString(ch); // Alternatively // st =…
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