显示效果是这样的：

代码如下：

		int hangshu = 11;
		int yiban = hangshu / 2 + 1;
		int yibanduo = hangshu / 2;
		System.out.println("空心菱形：");
		for(int k = 1;k <= yiban;k++){
			for(int i = 1;i <= (yiban - k);i++){
				System.out.print(" ");
			}
			System.out.print("*");
			for(int i = 1;i <= ( (k - 2) * 2 + 1);i++){
				System.out.print(" ");
			}
			if(k != 1){
				System.out.print("*");	
			}
			System.out.println();
		}
		for(int k = yibanduo;k >=1;k--){
			for(int i = 1;i <= (yiban - k);i++){
				System.out.print(" ");
			}
			System.out.print("*");
			for(int i = 1;i <= ( (k - 2) * 2 + 1);i++){
				System.out.print(" ");
			}
			if(k != 1){
				System.out.print("*");	
			}
			System.out.println();
		}


		System.out.println("实心菱形：");
		for(int i = 1;i <= hangshu;i++){
			if(i <= hangshu/2 + 1){
				for(int k = 1;k <= hangshu/2 + 1- i;k++){
					System.out.print(" ");
				}
				for(int k = 1;k <= i;k++){
					System.out.print("* ");
				}
					System.out.println();
			}else{
				for(int k =1;k <= (i -(hangshu/2 + 1));k++){
					System.out.print(" ");
				}
				for(int k = 1;k <= (2 *(hangshu/2 + 1) - i);k++){
					System.out.print("* ");
				}
				System.out.println();
			}	
		}
		

ok，就这样了。。