How to convert BigInteger to String in java

Question

I converted a String to BigInteger as follows:

Scanner sc=new Scanner(System.in);
System.out.println(\"enter the message\");
String         


        

Answer 1

To reverse

byte[] bytemsg=msg.getBytes(); 

you can use

String text = new String(bytemsg); 

using a BigInteger just complicates things, in fact it not clear why you want a byte[]. What are planing to do with the BigInteger or byte[]? What is the point?

Answer 2

You can also use Java's implicit conversion:

BigInteger m = new BigInteger(bytemsg); 
String mStr = "" + m;  // mStr now contains string representation of m.

Answer 3

Why don't you use the BigInteger(String) constructor ? That way, round-tripping via toString() should work fine.

(note also that your conversion to bytes doesn't explicitly specify a character-encoding and is platform-dependent - that could be source of grief further down the line)