How to draw

Question

X 1 1 1 0
1 X 1 0 A
1 1 X A A
1 0 A X A
0 A A A X

Answer 1

You can use a 2d array.

Answer 2

why

Answer 3

for (int i=0;i <=4;i++){
for (int j=0;j <=4;j++)
if (i==j)System.out.print("X ");
else if (i+j==4)System.out.print("0 ");
else if (i+j<=4-1)System.out.print("1 ");
else System.out.print("A ");
System.out.println ();}