将大整数解析并格式化为二进制，八进制和十六进制

import java.math.BigInteger;


public class Main {
/**
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**/

  public void m() throws Exception {

    BigInteger bi = new BigInteger("1023");


    // Parse and format to binary

    bi = new BigInteger("111111111111", 2);

    String s = bi.toString(2); 


    // Parse and format to octal

    bi = new BigInteger("1777", 8); 

    s = bi.toString(8); 
    /**
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    **/


    // Parse and format to decimal

    bi = new BigInteger("1012323"); 

    s = bi.toString(); 


    // Parse and format to hexadecimal

    bi = new BigInteger("3f123f", 16); 

    s = bi.toString(16);