剑指offer12 打印从1到N位的所有数字，处理大整数情况

/**
 *
 */
package jianzhioffer;

/**
 * @Description  输入n位数，输出0-N的所有数
 * @author liutao
 * @data 2016年4月22日
 */
public class a12_print1ToMaxOfNDigits {
    public static void Print1ToN(int n){
        if(n<=0) return ;
        char[] number = new char[n];
        for(int i=0;i<10;i++){
            number[0] = (char)(i+'0');
            print1ToNRecursively(number,n,0);
        }
    }

    public static void print1ToNRecursively(char[] number,int length,int index){
        if(index == length-1){
            printNumber(number);
            return;
        }
        for(int i=0;i<10;++i){
            number[index+1] = (char)(i+'0');
            print1ToNRecursively(number,length,index+1);
        }
    }
    public static void printNumber(char[]num){
        boolean isBeginning = true;
        int len = num.length;
        for(int i=0;i<len;i++){
            if(isBeginning&&num[i]!='0'){
                isBeginning = false;
            }
            if(!isBeginning){
                System.out.print(num[i]);
            }
        }
        if(!isBeginning)
            System.out.println();
    }
    public static void main(String[] args) {
        Print1ToN(3);
    }
}