class Palindrome{
      public static void main(String args[]){
          int num = Integer.parseInt(args[0]);
          int n = num; //used at last time check
          int reverse=0,remainder;
          while(num > 0){
                remainder = num % 10;
                reverse = reverse * 10 + remainder;
                num = num / 10;
           }
          if(reverse == n)
              System.out.println(n+" is a Palindrome Number");
          else
              System.out.println(n+" is not a Palindrome Number");
     }
}

class Armstrong{
      public static void main(String args[]){
      int num = Integer.parseInt(args[0]);
      int n = num; //use to check at last time
      int check=0,remainder;
      while(num > 0){
           remainder = num % 10;
           check = check + (int)Math.pow(remainder,3);
           num = num / 10;
      }
      if(check == n)
            System.out.println(n+" is an Armstrong Number");
      else
            System.out.println(n+" is not a Armstrong Number");
   }
}

class InvertTriangle{

      public static void main(String args[]){
           int num = Integer.parseInt(args[0]);
           while(num > 0){
              for(int j=1;j<=num;j++){
                  System.out.print(" "+num+" ");
                }
                System.out.print("\n");
                num--;
            }
      }
}

BufferedReader vs Scanner in Java

Scanner and BufferedReader Example in Java

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;

/**
 * Java Program to demonstrate how to use Scanner and BufferedReader class in
 * Java.
 *
 * @author WINDOWS 8
 *
 */
public class ScannerVsBufferedReader{

    public static void main(String[] args) {

        // Using Scanner to read user input
        Scanner scnr = new Scanner(System.in);
        System.out.println("=======================================");
        System.out.println("You can use Scanner to read user input");
        System.out.println("=======================================");
        System.out.println("Please enter a String");
        String name = scnr.nextLine();
        System.out.println("You have entered " + name);
        System.out.println("Please enter an integer");
        int age = scnr.nextInt();
        System.out.println("You have entered " + age);

        scnr.close();

        // Using BufferedReader to read a file
        System.out.println("=======================================");
        System.out.println("You can use BufferedReader to read a file");
        System.out.println("=======================================");
        FileReader fileReader;
        try {
            fileReader = new FileReader("abc.txt");
            BufferedReader buffReader = new BufferedReader(fileReader);

            System.out.println("File contains following lines");
            String line = buffReader.readLine();

            while (line != null) {
                System.out.println(line);
                line = buffReader.readLine();
            }

            buffReader.close();
            fileReader.close();

        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}

Output
=======================================
You can use Scanner to read user input
=======================================
Please enter a String
James
You have entered James
Please enter an integer
32
You have entered 32
=======================================
You can use BufferedReader to read a file
=======================================
File contains following lines
1. Which is best SmartPhone in the market?
a) iPhone 6S
b) Samsung Galaxy Edge
c) Something else