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。。
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