峰谷电电费计算程序

package nathan.epower;

public class PowerCalc {
	private double top;
	private double down;
	private double topCost;
	private double downCost;
	private boolean status;

	public void calc(String[] args) {
		if (!validateArgs(args)) {
			status = false;
			return;
		}

		PowerMeter curMeter = getCurMeter(args);
		PowerMeter lstMeter = getLastMeter(args);

		down = curMeter.down - lstMeter.down;
		top = curMeter.total - lstMeter.total - down;

		topCost = top * 0.56;
		downCost = down * 0.28;

		status = true;
	}

	private boolean validateArgs(String[] args) {
		if (args == null || args.length != 4) {
			System.out
					.println("Useage: java PowerCalc 当前总电量度数 当前谷电量度数 上次总电量度数 上次谷电量度数");
			return false;
		}
		return true;
	}

	private PowerMeter getCurMeter(String[] args) {
		PowerMeter m = new PowerMeter();
		m.total = Double.valueOf(args[0]);
		m.down = Double.valueOf(args[1]);
		return m;
	}

	private PowerMeter getLastMeter(String[] args) {
		PowerMeter m = new PowerMeter();
		m.total = Double.valueOf(args[2]);
		m.down = Double.valueOf(args[3]);
		return m;
	}

	public void report() {
		if (status) {
			custmorReport();
		}
	}

	protected void custmorReport() {
		System.out.println("--------------------------------------");
		System.out.println("|峰电度数:" + top + " " + "谷电度数:" + down);
		System.out.println("|峰电电费:" + topCost);
		System.out.println("|谷电电费:" + downCost);
		System.out.println("|总电费: " + top + "*0.56+" + down + "*0.28="
				+ getCost());
		System.out.println("--------------------------------------");
	}

	public double getTop() {
		return top;
	}

	public double getDown() {
		return down;
	}

	public double getCost() {
		return topCost + downCost;
	}

	class PowerMeter {
		double total;
		double down;
	}

	public double getTopCost() {
		return topCost;
	}

	public double getDownCost() {
		return downCost;
	}

	public static void main(String[] args) {
		PowerCalc pc = new PowerCalc();
		pc.calc(args);
		pc.report();
	}
}

java nathan.epower.PowerCalc 12580 6284 12312 6149

--------------------------------------
|峰电度数:133.0 谷电度数:135.0
|峰电电费:74.48
|谷电电费:37.800000000000004
|总电费: 133.0*0.56+135.0*0.28=112.28
--------------------------------------