*
* **
版本1:实现输出空心菱形
版本2:实现输出实心菱形
版本3:输入偶数数字,根据数字输出菱形
public class xing { public static void main(String[] args) { int layer = 5; for(int i=1;i<=layer;i++){ int spaceNum = layer-i; for(int j=1;j<=spaceNum;j++){ System.out.print(" "); } int starNum = 2*i-1; for(int j=1;j<=starNum;j++){ if(j==1||j==starNum){ System.out.print("*"); }else{ System.out.print(" "); } } System.out.println(); } for(int i=(layer-1);i>=1;i--){ int sapceNum = layer-i; for(int j=1;j<=sapceNum;j++){ System.out.print(" "); } int starNum = 2*i-1; for(int j=1;j<=starNum;j++){ if(j==1||j==starNum){ System.out.print("*"); }else{ System.out.print(" "); } } System.out.println(); } } }