Create magic box for any odd number from Java

• Start your Eclipse IDE
• Type the following code in a class named MagicSquare:

import java.util.Scanner;

public class MagicSquare {

public static void main(String[] args) {

System.out.println("Welcome to MagicBox");

System.out.println("---------------------------------------------------------------------------");

System.out.println("Enter any odd number for which you want to create a magic box.(Greater than 1");

Scanner scan=new Scanner(System.in);

int n=scan.nextInt();

if (n%2==0) {System.out.println("You didn't enter an odd number");System.exit(0);}

System.out.println("---------------------------------------------------------------------------");

int ct=1;

int a[][]=new int[n][n];

int x=(n+1)/2;

int y=(n-1)/2;

for (int i=0;i<n;i++) {

for (int j=0;j<n;j++) {

a[x][y]=ct;

ct++;x++;y--;

if (x==n) {x=0;}

if (y==-1) {y=n-1;}

}

x=(x+1)%n;y++;if (y==n) {y=0;}

}

int num=(int) Math.floor(Math.log10((double)(Math.pow(n, 2)))+1);

for (int i=0;i<n;i++) {

for (int j=0;j<n;j++) {

if (Math.floor(Math.log10((double)a[j][i])+1)>num) {num=a[j][i];}

}

}

String space="";

double spc=0;

for (int i=0;i<n;i++) {

for (int j=0;j<n;j++) {

spc=num-Math.floor(Math.log10((double)a[j][i])+1);

for (int abc=0;abc<spc;abc++) {

space=space+" ";

}

System.out.print(" |"+" "+a[j][i]+space);

space="";

}

System.out.println(" |");

}

}

}

• Execute the code

Demo of Frequency project in Java

 This is a demo of the project in java about the frequency of a word in a .txt file

Find frequency of keyword in Java

 This program checks the frequency of a keyword in any .txt file

• Start your IDE 
• Type in a class named Frequency :

import java.io.File;

import java.io.FileNotFoundException;

import java.util.Scanner;

public class Frequency {

public static void main(String[] args) throws FileNotFoundException {

Scanner scan2=new Scanner(System.in);

String src="";

System.out.println("Enter main file path (Only .txt files approved)");

for (;;){

src=scan2.nextLine();

if (new File(src).exists()==true){break;}

System.out.println("Your file doesn't exist. Please try again.");

}System.out.println("-----------------------------------------------------------------------");

System.out.println("Welcome to Frequency");

System.out.println("-----------------------------------------------------------------------");

for (;;){

Scanner scan=new Scanner(new File(src));

System.out.println("Enter the word that you want to find: (Type $END$ to terminate program.)");

String chr=scan2.next().replace("\"", "");

if (chr.equals("$END$")){System.out.println("Terminating program...");System.out.println("Terminated");break;}

chr=chr.replace("?", "");

chr=chr.replace(";", "");

chr=chr.replace("!", "");

chr=chr.replace(",", "");

chr=chr.replace("'", "");

chr=chr.replace("’", "");

chr=chr.replace(".", "");

chr=chr.replace(":", "");

chr=chr.replace("(", "");

chr=chr.replace(")", "");

chr=chr.replace("]", "");

chr=chr.replace("[", "");

chr=chr.replace("{", "");

chr=chr.replace("}", "");

chr=chr.replace("-", "");

chr=chr.replace("@", "");

chr=chr.replace("%", "");

chr=chr.replace("*", "");

chr=chr.replace("#", "");

chr=chr.replace("`", "");

chr=chr.replace("~", "");

chr=chr.replace("/", "");

chr=chr.replace("\\", "");

chr=chr.replace(">", "");

chr=chr.replace("<", "");

double frq=0;

double total=0;

String y="";

while (scan.hasNext()){

y=scan.next().replace("\"", "");

y=y.replace("?", "");

y=y.replace(";", "");

y=y.replace("!", "");

y=y.replace(",", "");

y=y.replace("’", "");

y=y.replace("'", "");

y=y.replace(".", "");

y=y.replace(":", "");

y=y.replace("(", "");

y=y.replace(")", "");

y=y.replace("]", "");

y=y.replace("[", "");

y=y.replace("{", "");

y=y.replace("}", "");

y=y.replace("-", "");

y=y.replace("@", "");

y=y.replace("%", "");

y=y.replace("*", "");

y=y.replace("#", "");

y=y.replace("`", "");

y=y.replace("~", "");

y=y.replace("/", "");

y=y.replace("\\", "");

y=y.replace(">", "");

y=y.replace("<", "");

//System.out.println(y); Just to see result

total++;

if (y.equalsIgnoreCase(chr)){frq++;}

}

System.out.println("Word appears "+frq+" times");

System.out.println("The word has an appearance frequency in the text of "+frq/total*100+"%");

System.out.println("-----------------------------------------------------------------------");}

}

}

• Execute the code

Tic-tac-toe in Java

• This is a functional tic-tac-toe game in Java.
• All things will be explained when you run the code.
• Type the following code in your IDE

import java.util.Scanner;

public class tic_tac_toe {

public static void main(String[] args) {

String turn="";

Scanner scan=new Scanner(System.in);

System.out.println("Welcome to tic-tac-toe");

System.out.println("Let's start");

System.out.println("Take a sheet of paper and draw a 3-by-3 grid");

System.out.println("Now mark them like this:");

System.out.println("1 2 3");

System.out.println("4 5 6");

System.out.println("7 8 9");

System.out.println("You can tell me your turn by writing only the cell number(1-9), nothing else.");

System.out.println("Only legal play is allowed. You get error in wrong turns.");

for(;;){

loop:{

System.out.println("\nComputer:X in 7");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("1")){

System.out.println("Computer:X in 9");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("8")){

System.out.println("Computer:X in 3");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("5")){System.out.println("Computer:X in 6");System.out.println("Computer won.");break loop;}

if (turn.equals("6")){System.out.println("Computer:X in 5");System.out.println("Computer won.");break loop;}

if (turn!="5" & turn!="6"){System.out.println("Computer:X in 5");System.out.println("Computer won.");break loop;}

}

if (turn!="8"){System.out.println("Computer:X in 8");System.out.println("Computer won.");break loop;} 

}

if (turn.equals("2")){

System.out.println("Computer:X in 1");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("4")){

System.out.println("Computer:X in 9");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("5")){System.out.println("Computer:X in 8");System.out.println("Computer won.");break loop;}

if (turn.equals("8")){System.out.println("Computer:X in 5");System.out.println("Computer won.");break loop;}

if (turn!="5" & turn!="8"){System.out.println("Computer:X in 5");System.out.println("Computer won.");break loop;}

}

if (turn!="4"){System.out.println("Computer:X in 4");System.out.println("Computer won.");break loop;} 

}

if (turn.equals("3")){

System.out.println("Computer:X in 1");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("4")){

System.out.println("Computer:X in 9");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("5")){System.out.println("Computer:X in 8");System.out.println("Computer won.");break loop;}

if (turn.equals("8")){System.out.println("Computer:X in 5");System.out.println("Computer won.");break loop;}

if (turn!="5" & turn!="8"){System.out.println("Computer:X in 5");System.out.println("Computer won.");break loop;}

}

if (turn!="4"){System.out.println("Computer:X in 4");System.out.println("Computer won.");break loop;} 

}

if (turn.equals("4")){

System.out.println("Computer:X in 9");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("8")){

System.out.println("Computer:X in 3");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("5")){System.out.println("Computer:X in 6");System.out.println("Computer won.");break loop;}

if (turn.equals("6")){System.out.println("Computer:X in 5");System.out.println("Computer won.");break loop;}

if (turn!="5" & turn!="6"){System.out.println("Computer:X in 5");System.out.println("Computer won.");break loop;}

}

if (turn!="8"){System.out.println("Computer:X in 8");System.out.println("Computer won.");break loop;} 

}

if (turn.equals("5")){

System.out.println("Computer:X in 1");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("4")){

System.out.println("Computer:X in 6");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("3")){System.out.println("Computer:X in 9");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("2")){System.out.println("Computer:X in 8");System.out.println("Computer won.");break loop;}

if (turn.equals("8")){System.out.println("Computer:X in 2");System.out.println("Match draw.");break loop;}

}

if (turn.equals("9")){System.out.println("Computer:X in 3");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("2")){System.out.println("Computer:X in 8");System.out.println("Match draw.");break loop;}

if (turn.equals("8")){System.out.println("Computer:X in 2");System.out.println("Computer won.");break loop;}

}

if (turn.equals("2")){System.out.println("Computer:X in 8");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("3")){System.out.println("Computer:X in 9");System.out.println("Computer won.");break loop;}

if (turn.equals("9")){System.out.println("Computer:X in 3");System.out.println("Match draw.");break loop;}

}

if (turn.equals("8")){System.out.println("Computer:X in 2");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("3")){System.out.println("Computer:X in 9");System.out.println("Match draw.");break loop;}

if (turn.equals("9")){System.out.println("Computer:X in 3");System.out.println("Computer won.");break loop;}

}

}

if (turn!="4"){System.out.println("Computer:X in 4");System.out.println("Computer won.");break loop;} 

}

if (turn.equals("6")){

System.out.println("Computer:X in 1");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("4")){

System.out.println("Computer:X in 5");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("3")){System.out.println("Computer:X in 9");System.out.println("Computer won.");break loop;}

if (turn.equals("9")){System.out.println("Computer:X in 3");System.out.println("Computer won.");break loop;}

if (turn!="3" & turn!="9"){System.out.println("Computer:X in 3");System.out.println("Computer won.");break loop;}

}

if (turn!="4"){System.out.println("Computer:X in 4");System.out.println("Computer won.");break loop;} 

}

if (turn.equals("8")){

System.out.println("Computer:X in 1");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("4")){

System.out.println("Computer:X in 3");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("5")){System.out.println("Computer:X in 2");System.out.println("Computer won.");break loop;}

if (turn.equals("2")){System.out.println("Computer:X in 5");System.out.println("Computer won.");break loop;}

if (turn!="5" & turn!="2"){System.out.println("Computer:X in 5");System.out.println("Computer won.");break loop;}

}

if (turn!="4"){System.out.println("Computer:X in 4");System.out.println("Computer won.");break loop;} 

}

if (turn.equals("9")){

System.out.println("Computer:X in 1");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("4")){

System.out.println("Computer:X in 3");

System.out.println("Your turn:");

turn=scan.next();

if (turn.equals("5")){System.out.println("Computer:X in 2");System.out.println("Computer won.");break loop;}

if (turn.equals("2")){System.out.println("Computer:X in 5");System.out.println("Computer won.");break loop;}

if (turn!="5" & turn!="2"){System.out.println("Computer:X in 5");System.out.println("Computer won.");break loop;}

}

if (turn!="4"){System.out.println("Computer:X in 4");System.out.println("Computer won.");break loop;} 

}

}System.out.println("\nNew Game");

}

 

}

}

• Now execute the code.