打印菱形

package com.cyuyan.test1;

public class LingXingTest1 {
    public static void main(String args[]){
      final int size = 4;
//前四行
      for (int i = 1; i <= size; i++) {
       for (int j = i; j < size; j++) {
        System.out.print(" ");
       }

       for (int k = 1; k <= 2 * i - 1; k++) {
        System.out.print("*");
       }
//换行
       System.out.println();
      }
//后三行
      for (int i = size - 1; i >= 1; i--) {
       for (int j = 1; j <= size - i; j++) {
        System.out.print(" ");
       }

       for (int k = 2 * i - 1; k > 0; k--) {
        System.out.print("*");
       }
     //换行
       System.out.println();
      }

     }


}

运行效果：

   *
  ***
 *****
*******
 *****
  ***
   *