Question

generate a single digit number that represents number of lines two display and write a program in java to generate following pattern
1
121
12321
1234321
123454321

Answer 1

Google "java for loop pyramid"

Answer 2

public static void main(String[] args) {
int x = 5; // this is the number of lines
for (int i = 1; i <= x; i++) {
for (int j = 1; j <= x - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= i; k++) {
System.out.print(k);
}
if (i >= 2) {
for (int l = 1; l <= i - 1; l++) {
System.out.print(i - l);
}
}
System.out.print("\n");
}
}