java - 浮点型错误， double 型没有错误

我编写了一个简单的Java程序，输出您在月球上的体重。以下代码

    class MoonWeight
    {
        public static void main(String args[])
        {
            double earthWeight = 195.0;
            double moonWeight = earthWeight*.17;
            System.out.println("On Earth you weigh " + earthWeight +
            ", on the moon you weigh " + moonWeight);
        }
    }

产生输出“在地球上，您重195.0，在月球上重33.150000000000006”，但是当我使用类型float时：

    class MoonWeight
    {
        public static void main(String args[])
        {
            float earthWeight = 195.0;
            float moonWeight = earthWeight*.17;
            System.out.println("On Earth you weigh " + earthWeight +
            ", on the moon you weigh " + moonWeight);
        }
    }

我收到以下错误error: incompatible types: possible lossy conversion from double to float，这是为什么？

最佳答案

要指定数字为浮点数，必须以F或f结尾，这样代码将显示为：

float earthWeight = 195.0f;
float moonWeight = earthWeight * .17f;