public class Diamond { 
  public static void main(String[] args) { 
    printHollowRhombus(6); 
  } 
   
  public static void printHollowRhombus(int size) { 
    if (size % 2 == 0) { 
      size++;// 计算菱形大小 
    } 
    for (int i = 0; i < size / 2 + 1; i++) { 
      for (int j = size / 2 + 1; j > i + 1; j--) { 
        System.out.print(" ");// 输出左上角位置的空白 
      } 
      for (int j = 0; j < 2 * i + 1; j++) { 
        if (j == 0 || j == 2 * i) { 
          System.out.print("* ");// 输出菱形上半部边缘 
        } else { 
          System.out.print(" ");// 输出菱形上半部空心 
        } 
      } 
      System.out.println("");   //换行 
    } 
    for (int i = size / 2 + 1; i < size; i++) { 
      for (int j = 0; j < i - size / 2; j++) { 
        System.out.print(" ");// 输出菱形左下角空白 
      } 
      for (int j = 0; j < 2 * size - 1 - 2 * i; j++) { 
        if (j == 0 || j == 2 * (size - i - 1)) { 
          System.out.print("* ");// 输出菱形下半部边缘 
        } else { 
          System.out.print(" ");// 输出菱形下半部空心 
        } 
      } 
      System.out.println("");   //换行 
    } 
  } 
} 

public class StartG {
  public static void main(String [] args)
  {
    int i=0;
    int j=0;
    for(i=1;i<=4;i++)
    {  for(j=1;j<=2*i-1;j++)
       System.out.print("*");
      System.out.println("");  
    }
    for(i=4;i>=1;i--)
    { for(j=1;j<=2*i-3;j++)
        System.out.print("*");
      System.out.println("");  
    }
  }
 }