java如何强制转换ifelse开关语句

Question

我想我需要施展这个密码。我需要返回一个整数，但我必须乘以百分比，不希望它们被截断
我应该这样投吗brains = (double)brains - (this.getBrains() * 0.01);
我还应该在结尾处使用return语句吗？我在铸造方面很弱，我一直在努力寻找有帮助的例子，但它们没有帮助。

          if(attacker >= attackee)
            {
            switch (weapon)
                {
                    case 't':
                        brains = brains + (other.getBrains() * 0.01);
                        attack = other.getBrains() * -0.01;
                        other.addBrains(attack); 
                        break;

                    case 's':
                        brains = brains + (other.getBrains() * 0.05);
                        attack = other.getBrains() * -0.05;
                        other.addBrains(attack); 
                        break;  

                    case 'c':
                        brains = brains + (other.getBrains() * 0.10);
                        attack = other.getBrains() * -0.10;
                        other.addBrains(attack); 
                        break;  

                    case 'k':
                        brains = brains + (other.getBrains() * 0.20);
                        attack = other.getBrains() * -0.20;
                        other.addBrains(attack); 
                        break;
                }
         }
        else 
            {
                switch (weapon)
                {
                    case 't':
                        brains = brains - (this.getBrains() * 0.01);
                        attack = this.getBrains() * 0.01;
                        other.addBrains(attack);
                        break;

                    case 's':
                        brains = brains - (this.getBrains() * 0.01);
                        attack = this.getBrains() * 0.01;
                        other.addBrains(attack);
                        break;  

                    case 'c':
                        brains = brains - (this.getBrains() * 0.01);
                        attack = this.getBrains() * 0.01;
                        other.addBrains(attack);
                        break;

                    case 'k':
                        brains = brains - (this.getBrains() * 0.01);
                        attack = this.getBrains() * 0.01;
                        other.addBrains(attack);
                        break;      
                }
            }                   
    return attack;
}