Java Articles - Page 645 of 745

The Map class's object contains key and value pairs. You can convert it into two list objects one which contains key values and the one which contains map values separately. To convert a map to list − Create a Map object. Using the put() method insert elements to it as key, value pairs Create an ArrayList of integer type to hold the keys of the map. In its constructor call the method keySet() of the Map class. Create an ArrayList of String type to hold the values of the map. In ... Read More

The Map class's object contains key and value pairs. You can convert it into two list objects one which contains key values and the one which contains map values separately. To convert a map to list − Create a Map object. Using the put() method insert elements to it as key, value pairs Create an ArrayList of integer type to hold the keys of the map. In its constructor call the method keySet() of the Map class. Create an ArrayList of String type to hold the values of the map. In ... Read More

To join two given lists the addAll() method of the java.util.ArrayList class is used to insert all of the elements in the specified collection into this list. To add contents of a list to another − Problem Statement Write a program in Java to join two given lists − Input Contents of list1 ::[Apple, Orange, Banana] Contents of list2 ::[Grapes, Mango, Strawberry] Output Contents of list1 after adding list2 to it ::[Apple, Orange, Banana, Grapes, Mango, Strawberry] Steps to join two given lists Following are the steps to join two given lists − ... Read More

To join two given lists the addAll() method of the java.util.ArrayList class is used to insert all of the elements in the specified collection into this list. To add contents of a list to another − Problem Statement Write a program in Java to join two given lists − Input Contents of list1 ::[Apple, Orange, Banana] Contents of list2 ::[Grapes, Mango, Strawberry] Output Contents of list1 after adding list2 to it ::[Apple, Orange, Banana, Grapes, Mango, Strawberry] Steps to join two given lists Following are the steps to join two given lists − ... Read More

A List is a collection in Java that is used to store a sequence of elements. It is part of the Java Collections Framework and allows us to perform various operations on the elements, such as adding, removing, and accessing them. Converting a list to an array in Java can be done using several methods. Below are some of the common ways to achieve this: Using For Loop Using toArray() Method Using Stream API Using a For Loop We will use the for loop to iterate ... Read More

The Java.io.BufferedWriter class writes text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays, and strings. To add contents to a file − Instantiate the BufferedWriter class. By passing the FileWriter object as an argument to its constructor. Write data to the file using the write() method.Exampleimport java.io.File; import java.io.FileWriter; import java.io.BufferedWriter; import java.io.IOException; public class AppendToFileExample {    public static void main( String[] args ) {       try {          String data = " Tutorials Point is a best website in the world";       ... Read More

The Java.io.BufferedWriter class writes text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays, and strings. To add contents to a file − Instantiate the BufferedWriter class. By passing the FileWriter object as an argument to its constructor. Write data to the file using the write() method.Exampleimport java.io.File; import java.io.FileWriter; import java.io.BufferedWriter; import java.io.IOException; public class AppendToFileExample {    public static void main( String[] args ) {       try {          String data = " Tutorials Point is a best website in the world";       ... Read More

Following is an example to add a given time to a particular date.ProgramLive Demoimport java.util.*; public class Main {    public static void main(String[] args) throws Exception {       Date d1 = new Date();       Calendar cl = Calendar. getInstance();       cl.setTime(d1);       System.out.println("today is " + d1.toString());       cl. add(Calendar.MONTH, 1);       System.out.println("date after a month will be " + cl.getTime().toString() );       cl. add(Calendar.HOUR, 70);       System.out.println("date after 7 hrs will be " + cl.getTime().toString() );       cl. add(Calendar.YEAR, ... Read More

Following is an example to add a given time to a particular date.ProgramLive Demoimport java.util.*; public class Main {    public static void main(String[] args) throws Exception {       Date d1 = new Date();       Calendar cl = Calendar. getInstance();       cl.setTime(d1);       System.out.println("today is " + d1.toString());       cl. add(Calendar.MONTH, 1);       System.out.println("date after a month will be " + cl.getTime().toString() );       cl. add(Calendar.HOUR, 70);       System.out.println("date after 7 hrs will be " + cl.getTime().toString() );       cl. add(Calendar.YEAR, ... Read More

In this article, we will learn to take a character input from the user and convert it into a string using Java. The toString() method of the Character class converts the character to a string. Problem Statement Write a program in Java to convert a character to a string. Input Enter a character :: T Output T Steps to convert character to string Following are the steps to convert characters to the string − We will start by importing the Scanner class to handle user input using java.util package. After that, ask ... Read More