学步园

例如：现在有整数1234，输出4321整数，问题摘自<<c语言范例开发大全>>

算法实现的不够好.

package com.jue.numberreverse;

public class NumberReverse {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int old = 123456789;
		System.out.println("old:" + old);
		System.out.println("new:" + getReverseDataNumber(old));
	}

	public static int getReverseDataNumber(int old) {
		final int length = getDataLength(old);
		final int[] datas = new int[length];
		int tempdata = old;
		for (int i = 0; i < length; i++) {
			int dataInIndex = tempdata / getMultipleData(length - 1 - i);
			datas[i] = dataInIndex;
			tempdata -= dataInIndex * getMultipleData(length - 1 - i);
		}

		int newdata = 0;
		for (int i = 0; i < datas.length; i++) {
			newdata += datas[i] * getMultipleData(i);
		}
		return newdata;
	}

	private static int getMultipleData(int indexInNumber) {
		if (indexInNumber == 0) {
			return 1;
		}
		return 10 * getMultipleData(indexInNumber - 1);
	}

	public static int getDataLength(int data) {
		return String.valueOf(data).length();
	}

}