最经典实现菱形算法

import java.util.Scanner;

public class  LingXing
{
public static void main(String []args)
{ int N;
 Scanner sc = new Scanner(System.in);
 System.out.println("请输入N的值");
 N = sc.nextInt();
for( int i = N-1; i >= -N+1;i--)
{
for( int j = 0;j < Math.abs(i)+3;j++)
 System.out.print(" ");

for( int j = 0;j < N - Math.abs(i);j++)
 System.out.print(" *");
System.out.println();
}

}
}