A composite number whose sum of digits equal to the sum of the digits of its prime factors.Ex: 58 = 2 x 29 (5 + 8 = 12) (2+ 2 + 9 = 12)Programpublic class SmithNumbers {    public static boolean isPrime(int number) {       int loop;       int prime = 1;       for(loop = 2; loop < number; loop++) {          if((number % loop) == 0) {             prime = 0;          }       }       if (prime ... Read More

Factors are the numbers we multiply to get another number.factors of 14 are 2 and 7, because 2 × 7 = 14.Some numbers can be factored in more than one way.16 can be factored as 1 × 16, 2 × 8, or 4 × 4.A number that can only be factored as 1 times itself is called a prime number.The first few primes are 2, 3, 5, 7, 11, and 13.The list of all the prime-number factors of a given number is the prime factors of a number. The factorization of a number into its prime factors and expression of ... Read More

You can delete a file using the delete() method of the File class.ProgramLive Demoimport java.io.File; public class DeleteFileExample {    public static void main(String[] args) {       try {          File file = new File("myFile");          if(file.delete()) {             System.out.println(file.getName() + " is deleted!");          } else {             System.out.println("Delete operation is failed.");          }          catch(Exception e) {             e.printStackTrace();       }    } }   OutputDelete operation is failed.

Following Java program copies a file to another.Programimport java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; public class CopyExample {    public static void main(String[] args) {       FileInputStream ins = null;       FileOutputStream outs = null;       try {          File infile = new File("C:\Users\TutorialsPoint7\Desktop\abc.txt");          File outfile = new File("C:\Users\TutorialsPoint7\Desktop\bbc.txt");          ins = new FileInputStream(infile);          outs = new FileOutputStream(outfile);          byte[] buffer = new byte[1024];          int length;           ... Read More

Java provides Reader classes to read data from various sources. You can read the contents of a file using the BufferedReader class.Programimport java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; public class BufferedReaderExample {    public static void main(String[] args) {       try (BufferedReader br = new BufferedReader(new FileReader("myFile"))) {          String sCurrentLine;                    while ((sCurrentLine = br.readLine()) != null) {             System.out.println(sCurrentLine);          }       } catch (IOException e) {          e.printStackTrace();       }    } }OutputHi welcome to Tutorialspoint

The Java.io.FilePermission class represents access to a file or directory. It consists of a pathname and a set of actions valid for that pathname. Following are the important points about File Permission −The actions to be granted are passed to the constructor in a string containing a list of one or more comma-separated keywords. The possible keywords are "read", "write", "execute", and "delete".The code can always read a file from the same directory it's in (or a subdirectory of that directory); it does not need explicit permission to do so.ProgramThe java.io.FileOutputStream implies(Permission p) method tests if this FilePermission object "implies" ... Read More