2.10（科学：计算能量）编写程序，计算将水从初始温度加热到最终温度所需的能量。程序应该提示用户输入水的重量（以千克为单位），以及水的初始温度和最终温度。

计算能量的公式是：Q = M × (最终温度 - 初始温度) × 4184

这里的M是以千克为单位的水的重量，温度以摄氏度为单位，而能量Q以焦耳为单位。

下面是一个运行示例：
Enter the amount of water in kilograms : 55.5
Enter the initial temperature : 3.5
Enter the final temperature : 10.5
The energy needed is 1625484

2.10(Science: calculating energy) Write a program that calculates the energy needed to heat water from an initial temperature to a final temperature. Your program should prompt the user to enter the amount of water in kilograms and the initial and final temperatures of the water.

The formula to compute the energy is Q = M × (finalTemperature – initialTemperature) × 4184

where M is the weight of water in kilograms, initial and final temperatures are in degrees Celsius, and energy Q is measured in joules.

Here is a sample run:
Enter the amount of water in kilograms : 55.5
Enter the initial temperature : 3.5
Enter the final temperature : 10.5
The energy needed is 1625484

下面是参考答案代码:

import java.util.*;public class CalculateEnergyQuestion10 {public static void main(String[] args) {double Joule,WaterKilo,InitTemp,FinalTemp;System.out.print("Enter the amount of water in kilograms : ");Scanner WaterInput = new Scanner(System.in);WaterKilo = WaterInput.nextDouble();System.out.print("Enter the initial temperature : ");Scanner InitTempInput = new Scanner(System.in);InitTemp = InitTempInput.nextDouble();System.out.print("Enter the final temperature : ");Scanner FinalTempInput = new Scanner(System.in);FinalTemp = FinalTempInput.nextDouble();Joule = WaterKilo * (FinalTemp - InitTemp) * 4184;System.out.println("The energy needed is " + Joule);}
}

运行效果：

注：编写程序要养成良好习惯
如：1.文件名要用英文，具体一点
2.注释要英文
3.变量命名要具体，不要抽象（如:a,b,c等等），形式要驼峰化
4.整体书写风格要统一（不要这里是驼峰，那里是下划线，这里的逻辑段落空三行，那里相同的逻辑段落空5行等等）