使用Java写出：给定两个浮点数，输出它们的和，差，积。

好的，这是一个计算问题，可以回答。下面是使用Java实现的示例代码：

public class Calculation {
    public static void main(String[] args) {
        double num1 = 2.5;
        double num2 = 1.8;
        
        double sum = num1 + num2;
        double diff = num1 - num2;
        double product = num1 * num2;
        
        System.out.println("Sum: " + sum);
        System.out.println("Difference: " + diff);
        System.out.println("Product: " + product);
    }
}

运行结果如下：

Sum: 4.3
Difference: 0.7
Product: 4.5

希望能对您有所帮助！