Question

java中如何用一个for循环输出空心菱形

Answer 1

import java.util.Scanner;
public class Demo2 {
public static void main(String[] args) {
Scanner sn=new Scanner(System.in);
System.out.println("输入行数");
int hang=sn.nextInt();
for(int i=1;i<=hang*2-1;i++){
for(int j=1;j<=Math.abs(i-hang);j++){
System.out.print(" ");
}
for(int j=1;j<=2*hang-1-2*Math.abs(hang-i);j++){
System.out.print("*");
}
System.out.println();
}
}
}