Answer Posted / chantiraji

public class TriangleDisplay {

public static void main(String[] args) {
int n = 4;
for (int i = 1; i <= n; i++) {
for (int j = 4; j < 2 * n - i; j++) {
System.out.print(" ");
}
for (int j = 1; j <= i; j++) {
if (i % 2 != 0) {
System.out.print("@" + " ");
} else {
System.out.print(j + " ");
}
}
System.out.println();
}
}
}

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