PPATERN Decemeber lunchtime 2018

This is my JAVA code for this question-
import java.util.*;

class Solution {

 public static void main(String[] args) {
	 Scanner ip=new Scanner(System.in);
	 int n=ip.nextInt();
	 int arr[][]=new int[n+1][n+1];
	 int a=1;
	 int i=1;
	 int j=1;
     int k=1;
	 int z=0;
	 while(1>0) {
	   int m=1;
	   if(k==n*2) {
		   break;
	   }
	   else if(k>n) {
		  i=k-n+1;
		  j=n;
		  z--;
	   }else {
	   i=1;
	   j=k;
	   z++;
	   }
	   while(m<=z) {
	    arr*[j]=a;
	    a++;
	    m++;
	    i++;
	    j--; 
	 }
	 k++;
	}
	 for(int r=1;r<=n;r++) {
		 for(int c=1;c<=n;c++) {
			 System.out.printf("%5d ",arr[r][c]);
		 }
		 System.out.println();
	 }
}

}

and the pattern printing for different cases is also correct,help me finding what is wrong in this.
Pattern for n=4:

1     2     4     7 
3     5     8    11 
6     9    12    14 

10 13 15 16

test cases t not considered

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