空心菱形

 private static void fun27() {
        for(int i=1;i<=5;i++){
            for(int j=1;j<=5-i;j++){
                System.out.print("  ");
            }
            for(int j=1;j<=2*i-1;j++){
                if(j==1||j==2*i-1){
                    System.out.print("* ");
                }else {
                    System.out.print("  ");
                }
            }
            System.out.println();
        }
        for(int i =1;i<=4;i++){
            for(int j=1;j<=i;j++){
                System.out.print("  ");
            }
            for(int j=1;j<=9-2*i;j++){
                if(j==1||j==9-2*i){
                    System.out.print("* ");
                    }else {
                    System.out.print("  ");
                }
            }
            System.out.println();
        }
    }