Create a class called Lab8b and in it implement all of the methods below. Also, write a main method with test calls to all of these methods. Don’t forget to turn in your file to Canvas before the end of the lab today.

Attached is the full questions:

import java.util.*;

public class Lab8b

{

public static int[][] random(int N,int start,int end){

int[][] array = new int[N][N];

Random r= new Random();

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

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

int rand = r.nextInt(end-start) + start;

/* generate random number from start(inclusive) to end(exclusive)*/

array[i][j]=rand;

System.out.print(array[i][j]+" ");

}

System.out.println();

}

return array;

}

public static int rowSum(int[][] a,int i){

int answer=0;

//iterate over the row and calculate sum

for(int j=0;j<a[i].length;j++)

answer+=a[i][j];

return answer;

}

public static int colSum(int[][] a,int j){

int answer=0;

//iterate over the column and calculate sum

for(int i=0;i<a.length;i++)

answer+=a[i][j];

return answer;

}

public static boolean isSquare(int[][] a){

int rowlength=a[0].length;

//iterate over each row and check if number of columns are same

for(int i=0;i<a[0].length;i++){

if(a[i].length!=rowlength)

return false;

}

return true;

}

public static boolean isLatin(int[][] a){

if(!isSquare(a))return false;

HashSet<Integer> set=new HashSet();

//check rowwise first if the numbers are all distinct and in sequence

for(int i=0;i<a.length;i++){

//populate hashset the numbers between 1 and n

for(int c=1;c<=a.length;c++)

set.add(c);

/*remove from hashset and check if it empties the set

if yes the it is a latin row

else return false

*/

for(int j=0;j<a.length;j++){

if(!set.contains(a[i][j])) return false;

set.remove(a[i][j]);

}

if(set.size()!=0) return false;

}

//check columnwise first if the numbers are all distinct and in sequence

for(int i=0;i<a.length;i++){

//populate hashset the numbers between 1 and n

for(int c=1;c<=a.length;c++)

set.add(c);

/*remove from hashset and check if it empties the set

if yes the it is a latin column

else return false

*/

for(int j=0;j<a.length;j++){

if(!set.contains(a[j][i])) return false;

set.remove(a[j][i]);

}

if(set.size()!=0) return false;

}

return true;

}

public static void main(String[] args) {

int[][] ar= random(5 , 1 ,11);

System.out.println("Testing random array");

System.out.println("rowSum "+rowSum(ar,1)); //the indexing starts from 0

System.out.println("colSum "+colSum(ar,1)); //the indexing starts from 0

System.out.println("isSquare? " + isSquare(ar));

System.out.println("isLatin? " + isLatin(ar));

int[][] allNeg={{-10,-12,-3},{-4,-5,-6,-8},{-7,-8}};

int[][] nonSquare={{1,2,3},{4,5},{3,1,2}};

int[][] latin={{1,2,3},{2,3,1},{3,1,2}};

int[][] nonLatin={{2,1,3},{2,3,1},{3,1,2}};

System.out.println("Testing allNeg array");

System.out.println("rowSum "+rowSum(allNeg,1)); //the indexing starts from 0

System.out.println("colSum "+colSum(allNeg,1)); //the indexing starts from 0

System.out.println("isSquare? " + isSquare(allNeg));

System.out.println("isLatin? " + isLatin(allNeg));

System.out.println("Testing nonSquare array");

System.out.println("rowSum "+rowSum(nonSquare,1)); //the indexing starts from 0

System.out.println("colSum "+colSum(nonSquare,1)); //the indexing starts from 0

System.out.println("isSquare? " + isSquare(nonSquare));

System.out.println("isLatin? " + isLatin(nonSquare));

System.out.println("Testing latin array");

System.out.println("rowSum "+rowSum(latin,1)); //the indexing starts from 0

System.out.println("colSum "+colSum(latin,1)); //the indexing starts from 0

System.out.println("isSquare? " + isSquare(latin));

System.out.println("isLatin? " + isLatin(latin));

System.out.println("Testing nonlatin array");

System.out.println("rowSum "+rowSum(nonLatin,1)); //the indexing starts from 0

System.out.println("colSum "+colSum(nonLatin,1)); //the indexing starts from 0

System.out.println("isSquare? " + isSquare(nonLatin));

System.out.println("isLatin? " + isLatin(nonLatin));

}

}

PART 2

import java.util.*;

public class Main

{

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.println("Enter the number M (number of rows and columns for array) ");

int M=sc.nextInt(); //take input

int[][] ar= new int[M][M];

System.out.print("+"); //print starting border

for(int i=0;i<M;i++)

System.out.print("-+");

System.out.println();

for(int i=0;i<M;i++){ //start from 0

System.out.print("|"); //print starting pipe Character

for(int j=1;j<=M;j++){ //start from 1

if((i+j)%M==0) //if sum of i&j equals M print M, i.e. last number

System.out.print( M+"|");

else

System.out.print( (i+j)%M +"|");//else print rotated number

}

System.out.println();

}

System.out.print("+"); //print ending border

for(int i=0;i<M;i++)

System.out.print("-+");

System.out.println();

}

}

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