theArjun

// Importing File class from Java io package.
// CLA in documentation refers to Command Line Argument.

import java.io.File;

// Creating a class named StringTest.
class StringTest{
    public static void main(String[] args){
        // To prevent any of the exception that may arise, I put the codes under try block.
        try{

theArjun

Tower of Hanoi

How's it is solved ?

Long steps ahead, but you're too intelligent to understand

To know more :

theArjun

#include<iostream>
using namespace std;

int factorial(int);

int main(){
    int number, factorialOfNumber;
    cout << "Enter a number you want to calculate factorial : ";
    cin >> number;

theArjun

#include<iostream>
using namespace std;

int fibonacci(int);

int main(){
    int number;
    cout << "Enter how many elements you want to see in Fibonacci Series : ";
    cin >> number;

theArjun

class Animal{
    // Creating the interface inside class; nested interface.
    interface Activity{
        public default void move(){
            System.out.println("Animal is moving.");
        }
    }
}

theArjun

// Can static and private function be overrided ?

class Animal {
    static void eat() {
        System.out.println("Eating.");
    }

    private void move() {
        System.out.println("Moving.");
    }

theArjun

// Create your own Exception.

class MyException extends Exception { // Inherits the partially unchecked exception class Exception.
    MyException(String msg) { // Parameterized constructor for MyException.
        super(msg); // Calls the constructor of Exception class; super class.
    }
}

class ExceptionDemo {
    static void isValid(int age) throws MyException { // Denotes this code may contain Exception; declaring exception here.

theArjun

class Five{
	public static void main(String[] args){
		for(int i = 1; i <= 4; i++){ // First we are running loop from 1 to 4.
			for(int j = 0; j < i; j++){ // Then we are running loop from 0 until i.
				System.out.print((j+i)%2+" "); // Sum of i and j modulus of 2 equals the alternate of 1 and 0. 
			}
			System.out.println();
		}
	}
}

theArjun

// This merges the two text files named "abc.txt" and "xyz.txt" alternatively.
// This question was asked later in Java Class 18 January, 2019.

import java.io.*;

class MergeFiles{
    public static void main(String[] args)throws IOException{
        try{
            PrintWriter pw = new PrintWriter(new File("finalText.txt"));
            BufferedReader brOne = new BufferedReader(new FileReader("abc.txt"));

theArjun

import java.io.*;
class MergeTextFiles {
	public static void main(String[] args) throws IOException {
		BufferedReader br; // Declaring a variable of BufferedReader data type so that it can be used inside loop to read every .txt files listed there.
		String path = "C:/users/arjun/Desktop/"; // This is pre-specified path, you can change it.
		PrintWriter pw = new PrintWriter(path + "mergedText.txt");
		String line; // This will get the lines on text files.
		String location;
		File[] filesFromPath = (new File(path)).listFiles();