BlueJ Pattern 1234 4321 and So On

 
Print the pattern
1 2 3 4
4 3 2 1
1 2 3 4
4 3 2 1

class Pat
{
     int i,j;
     void show(int n)
     {
         for(i=1;i<=n;i++)
         {
              for(j=1;j<=n;j++)
              {
                  if(i%2!=0)
                  System.out.print(j+ " ");
                  else
                  System.out.print((n+1-j)+ " ");
                }
System.out.println();
}
}
}