Execute commands on remote machine using python

	import paramiko
	remote_machine_name = raw_input('Enter the remote machine name:')
	ssh = paramiko.SSHClient()
	ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
	try:
	ssh.connect(remote_machine_name, username='xxx', password='yyy')
	print "connected successfully!"
	except paramiko.SSHException:
	print "connection error"
	stdin, stdout, stderr = ssh.exec_command('') # ssh.exec_command('(cd path;./shellscript.sh)')
	print "stderr: ", stderr.readlines()
	print "stdout: ", stdout.readlines()

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Hex to Decimal conversion in python

	import math
	num = raw_input() #2017
	sum = 0
	length = len(num)
	for l in xrange(length):
	sum = sum + (math.pow(16, length-l-1) * int(num[l]))
	print sum

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List of lists in Java

	package com.test;
	import java.util.ArrayList;
	public class Arraylist {
	public static void main(String[] args) {
	// TODO Auto-generated method stub
	ArrayList<ArrayList> x = new ArrayList<>();
	ArrayList al1 = new ArrayList(); //first array list
	al1.add("banana"); //add three fruits to first array list
	al1.add("starwbeery");
	al1.add("apple");
	//Now add first array list to x which is array of array list
	x.add(al1);
	ArrayList al2 = new ArrayList(); //second array list
	al2.add("carrom");//add three games to second array list
	al2.add("chess");
	al2.add("badminton");
	//Now add second array list to x which is array of array list
	x.add(al2);
	ArrayList al3 = new ArrayList();//third array list
	al3.add("Gangully"); //add three players to thirs array list
	al3.add("Zaheer");
	al3.add("Dravid");
	//Now add third array list to x which is array of array list
	x.add(al3);
	//To get these elements
	for(ArrayList al: x){
	System.out.println(al); //This prints the three different array lists
	//To get each element from each arraylist
	for(Object element : al){
	System.out.println(element);
	}
	}
	}
	}

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