1、
/**
* All possible chars for representing a number as a String
*/
final static char[] digits = { \'0\', \'1\', \'2\', \'3\', \'4\', \'5\', \'6\', \'7\', \'8\',
\'9\', \'a\', \'b\', \'c\', \'d\', \'e\', \'f\', \'g\', \'h\', \'i\', \'j\', \'k\', \'l\',
\'m\', \'n\', \'o\', \'p\', \'q\', \'r\', \'s\', \'t\', \'u\', \'v\', \'w\', \'x\', \'y\',
\'z\' };
public static String toHexString(int i) {
return toUnsignedString(i, 4);
}
/**
* Convert the integer to an unsigned number.
*/
private static String toUnsignedString(int i, int shift) {
char[] buf = new char[32];// 声明一个Int值长度的字符数组
int charPos = 32;
// 得到每位都是1的二进制数
int radix = 1 << shift;
int mask = radix - 1;
do {
buf[--charPos] = digits[i & mask];// 将i值的当前最低shift位的值赋值给声明的字符数组的前一位
i >>>= shift;// i右移shift位并赋值
}
while (i != 0);
return new String(buf, charPos, (32 - charPos));
}
2、
public static String decimalToHex(int decimal) {
String hex = "";
while (decimal != 0) {
int hexValue = decimal % 16;
hex = toHexChar(hexValue) + hex;
decimal = decimal / 16;
}
return hex;
}
public static char toHexChar(int hexValue) {
if (hexValue <= 9 && hexValue >= 0) {
return (char) (hexValue + \'0\');
}
else {// (hexValue <= 15 && hexValue >= 10)
return (char) (hexValue - 10 + \'A\');
}
}