Expain this code

public class Code2 {

public static void main (String[] args)

{

for (int x = 0; x<4; x++) {

for (int y= 4; y>2; y--)

{

System.out.println( x + " " + y);

}

if(x==1) {

x++;

}

}

}

}

OUTPUT

0 4

0 3

1 4

1 3

3 4

3 3