Java BigInteger to concat(BigInteger left, BigInteger right)

Description

concat

License

Open Source License

Declaration

private static BigInteger concat(BigInteger left, BigInteger right) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.math.BigInteger;

public class Main {
    private static BigInteger concat(BigInteger left, BigInteger right) {
        return concat(left, right, right.bitLength());
    }//from   ww  w . java  2s .c om

    private static BigInteger concat(BigInteger left, BigInteger right, int rightBitLength) {
        if (right.bitLength() > rightBitLength) {
            throw new IllegalArgumentException("right side has " + right.bitLength()
                    + " bits. Cannot be extended to " + rightBitLength + " bits");
        }
        return left.shiftLeft(rightBitLength).add(right);
    }
}

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