Whats Wrong in this code Why test case are going wrong.
import java.util.*;
public class WavePrintRowWise {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
System.out.print("");
int M=sc.nextInt();
int N=sc.nextInt();
System.out.print("");
int [][] arr=new int[M][N];
for(int i=0; i<M;i++)
{
for(int j=0; j<N;j++)
{
arr[i][j]=sc.nextInt();
}
}
printRowWise(arr);
}
public static void printRowWise(int[][] arr) {
for(int i=0;i<arr.length;i++) {
if(i%2==0) {
for(int j=0;j<arr[i].length;j++) {
System.out.print(arr[i][j]+",");
}
}else {
for(int j=arr[i].length-1;j>=0;j–) {
System.out.print(arr[i] [j]+",");
}
}
}
System.out.print(“END”);
}
}