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java 向上或向下取整Math

http://dilegencehe.blog.163.com/blog/static/43255413201111178523181/

向上取整用Math.ceil(double a)

向下取整用Math.floor(double a)

舉例:

  double a=35;
  double b=20;
  double c = a/b;
  System.out.println("c===>"+c);   //1.75
  System.out.println("c===>"+Math.ceil(c)); //2.0
  System.out.println(Math.floor(c));  //1.0