java菱形

import java.util.*;public class u {public static void main(String[] args) {System.out.print("请输入行数:");Scanner input = new Scanner(System.in);int hang = input.nextInt();for (int i = 1; i <= hang; i++) {for (int k = 1; k <= hang - i; k++) {System.out.print(" ");}for (int j = 1; j <= 2 * i - 1; j++) {System.out.print("*");}System.out.println();}for (int i = hang - 1; i >= 1; i--) {for (int k = 1; k <= hang - i; k++) {System.out.print(" ");}for (int j = 1; j <= 2 * i - 1; j++) {System.out.print("*");}System.out.println();}}}