Java BigInteger Calculate parseBigInteger(String s, BigInteger defaultValue)

Description

parse Big Integer

License

Apache License

Declaration

public static BigInteger parseBigInteger(String s, BigInteger defaultValue) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.math.BigInteger;

public class Main {
    public static BigInteger parseBigInteger(String s, BigInteger defaultValue) {
        String ch = getNumberChars(s);
        if (ch == null) {
            return defaultValue;
        }//from  ww w.j a  v a  2 s .c  om
        return new BigInteger(ch);
    }

    public static String getNumberChars(String s) {
        if (s == null) {
            return null;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            if ('0' <= c && c <= '9') {
                if (i == 1 && s.charAt(0) == '-') {
                    sb.append('-');
                }
                sb.append(c);
            }
        }
        if (sb.length() == 0) {
            return null;
        } else {
            return sb.toString();
        }
    }
}

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4. numberToShortString(BigInteger number)
5. order(BigInteger a, BigInteger p, BigInteger f[], BigInteger e[])
6. parseBinaryBigInteger(final byte[] buffer, final int offset, final int length, final boolean negative)
7. parseScaledNonNegativeBigInteger(String str)
8. product(final BigInteger min, final BigInteger max)
9. randomFromZn(BigInteger n, Random rand)