java string转枚举 java string转bigint

public class test {
    public static void main(String[] args){
        String a = "1234567890123456789";
        //String转为BigInteger
        BigInteger b=new BigInteger(a);
        //BigInteger转为String
        String c = String.valueOf(b);
        System.out.println("b:"+b);
        System.out.println("c:"+c);
    }
}

运行结果：