int转String

思路就是先计算出int 的长度，然后每次计算出一位数字

/**
 * Created by lxd on 16-8-6.
 */
public class Main {

    public static void main(String[] args) {
        Scanner cin = new Scanner(System.in);
        while (cin.hasNext()) {
            Convert(cin.nextInt());
        }
        cin.close();
    }

    public static void Convert(int num) {
        boolean isNagive = false;
        if (num < 0) {
            isNagive = true;
            num = 0 - num;
        }
        int[] res = new int[14];
        int length = 0;
        int temp = num;
        if (num == 0)
            length = 1;
        while (num != 0) {
            num = num / 10;
            res[length] = temp - num * 10;
            temp = num;
            length++;

        }
        StringBuilder stringBuilder = new StringBuilder(length);
        for (int i = length - 1; i >= 0; i--) {
            stringBuilder.append(res[i]);
        }
        if (isNagive)
            System.out.println("-" + stringBuilder.toString());
        else
            System.out.println(stringBuilder.toString());
    }
}