Hexo

public class mathDemon1 { public static void main(String[] args) { public static int abs(int a)//绝对值 public static double ceil(double a)//向上取整 public static double floor(double a)//向下取整 public static int max(int a,int b)//求最大值 public static int min(int a,int b)//求最小值 public static double pow(double a,double b)//求a的b次幂 public static double random()//求随机数[0.0,1.0) public static int round(float a)//四舍五入 public static double...

验证码获取: public class CodeUtil { public static String getCode(){ ArrayList<Character> list=new ArrayList<>(); for (int i = 0; i < 26; i++) { list.add((char)('a'+i)); list.add((char)('A'+i)); } for(int i=0;i<10;i++){ list.add((char)('0'+i)); } Random r=new Random(); int index; StringBuilder code=new StringBuilder(); ...