You can compare two Strings in Java using the compareTo() method, equals() method or == operator.The compareTo() method compares two strings. The comparison is based on the Unicode value of each character in the strings. The character sequence represented by this String object is compared lexicographically to the character sequence represented by the argument string.The result is a negative integer if this String object lexicographically precedes the argument string.The result is a positive integer if this String object lexicographically follows the argument string.The result is zero if the strings are equal, compareTo returns 0 exactly when the equals(Object) method would ... Read More

The FileInputStream class contains a method read(), this method accepts a byte array as a parameter and it reads the data of the file input stream to given byte array. Assume the file myData contains the following data −Exampleimport java.io.File; import java.io.FileInputStream; public class FileToByteArray {    public static void main(String args[]) throws Exception{       File file = new File("myData");       FileInputStream fis = new FileInputStream(file);       byte[] bytesArray = new byte[(int)file.length()];       fis.read(bytesArray);       String s = new String(bytesArray);       System.out.println(s);    } }OutputHi how are you welcome to Tutorialspoint

You can calculate the GCD of given two numbers, using recursion as shown in the following program.Exampleimport java.util.Scanner; public class GCDUsingRecursion {    public static void main(String[] args) {       Scanner sc = new Scanner(System.in);       System.out.println("Enter first number :: ");       int firstNum = sc.nextInt();       System.out.println("Enter second number :: ");       int secondNum = sc.nextInt();       System.out.println("GCD of given two numbers is ::"+gcd(firstNum, secondNum));    }    public static int gcd(int num1, int num2) {       if (num2 != 0){          return gcd(num2, num1 % num2);       } else{          return num1;       }    } }OutputEnter first number :: 625 Enter second number :: 125 GCD of given two numbers is ::125

ExampleFollowing is a program to multiply given floating point numbers.import java.util.Scanner; public class MultiplyFloatingNumbers {    public static void main(String args[]){       Scanner sc = new Scanner(System.in);       System.out.println("Enter first floating point number.");       float flt1 = sc.nextFloat();       System.out.println("Enter second floating point number.");       float flt2 = sc.nextFloat();       float product = flt1*flt2;       System.out.println("Product of given floating point numbers ::"+product);    } }OutputEnter first floating point number. 2.2 Enter second floating point number. 6.3 Product of given floating point numbers ::13.860001

The Set object provides a method known as toArray(). This method accepts an empty array as argument, converts the current Set to an array and places in the given array. To convert a Set object to an array − Create a Set object. Add elements to it. Create an empty array with size of the created Set. Convert the Set to an array using the toArray() method, bypassing the above-created array as an argument to it. Print the contents of the array.ExampleLive Demoimport java.util.HashSet; import java.util.Set; public class SetToArray {    public static void main(String args[]){       Set set = new HashSet();   ... 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

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 −Create list1 by instantiating list objects (in this example we used ArrayList).Add elements to it using add() method.Create another list. Add elements to it.Now add the elements of one list to other using the addAll() method.ExampleLive Demoimport java.util.ArrayList; public class JoinTwoLists {    public static void main(String args[]){       ArrayList list1 = new ArrayList();       list1.add("Apple");       list1.add("Orange");       list1.add("Banana");     ... Read More

The List object provides a method known as toArray(). This method accepts an empty array as argument, converts the current list to an array and places in the given array. To convert a List object to an array − Create a List object. Add elements to it. Create an empty array with size of the created ArrayList. Convert the list to an array using the toArray() method, bypassing the above-created array as an argument to it. Print the contents of the array.ExampleLive Demoimport java.util.ArrayList; public class ListToArray {    public static void main(String args[]){       ArrayList list = new ArrayList();       ... 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