简单的输出菱形

话不多说，今天遇到蛋疼的题了，难度不大，还是基础呀。

public class Test01 {
 
    // layer 由上到中间层数 str 输出的String
    public void outStr(int layer, String str) {
        // 正三角
        for (int i = 1; i <= layer; i++) {
            int space = layer - i; // 输出空格
            for (int j = space; j > 0; j--) {
                System.out.print(" ");
            }
            int strNum = 2 * i - 1; // 输出str
            for (int j = 0; j < strNum; j++) {
                System.out.print(str);
            }
            System.out.println();
        }
        // 倒三角
        for (int i = layer - 1; i > 0; i--) {
            int space = layer - i; // 输出空格
            for (int j = space; j > 0; j--) {
                System.out.print(" ");
            }
            int strNum = 2 * i - 1;// 输出str
            for (int j = 0; j < strNum; j++) {
                System.out.print(str);
            }
            System.out.println();
        }
 
    }
 
    // layer 由上到中间层数 str 输出的String
    public void outSpaceStr(int layer, String str) {
        // 正三角
        for (int i = 1; i <= layer; i++) {
            int space = layer - i; // 输出空格
            for (int j = space; j > 0; j--) {
                System.out.print(" ");
            }
            int strNum = 2 * i - 1; // 输出str
            for (int j = 0; j < strNum; j++) {
                if (j == 0 || j == (strNum - 1))
                    System.out.print(str);
                else
                    System.out.print(" ");
            }
            System.out.println();
        }
        // 倒三角
        for (int i = layer - 1; i > 0; i--) {
            int space = layer - i; // 输出空格
            for (int j = space; j > 0; j--) {
                System.out.print(" ");
            }
            int strNum = 2 * i - 1;// 输出str
            for (int j = 0; j < strNum; j++) {
                if (j == 0 || j == (strNum - 1))
                    System.out.print(str);
                else
                    System.out.print(" ");
            }
            System.out.println();
        }
 
    }
 
    public static void main(String[] args) {
 
        Test01 test01 = new Test01();
        test01.outStr(6, "*");
        test01.outSpaceStr(6, "*");
    }
}

输出结果

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