Java/Conversions/DecimalToHexaDecimal.java at master · java66liu/Java · GitHub

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package Conversions;

//hex = [0 - 9] -> [A - F]

class DecimalToHexaDecimal {

private static final int sizeOfIntInHalfBytes = 8;

private static final int numberOfBitsInAHalfByte = 4;

private static final int halfByte = 0x0F;

private static final char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E',

'F' };

// Returns the hex value of the dec entered in the parameter.

public static String decToHex(int dec) {

StringBuilder hexBuilder = new StringBuilder(sizeOfIntInHalfBytes);

hexBuilder.setLength(sizeOfIntInHalfBytes);

for (int i = sizeOfIntInHalfBytes - 1; i >= 0; --i) {

int j = dec & halfByte;

hexBuilder.setCharAt(i, hexDigits[j]);

dec >>= numberOfBitsInAHalfByte;

}

return hexBuilder.toString().toLowerCase();

}

// Test above function.

public static void main(String[] args) {

System.out.println("Test...");

int dec = 305445566;

String libraryDecToHex = Integer.toHexString(dec);

String decToHex = decToHex(dec);

System.out.println("Result from the library : " + libraryDecToHex);

System.out.println("Result decToHex method : " + decToHex);

}

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