废话不多上干货！
Class源码(SysConvert.java):
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/**
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* 个人数学工具
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*
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* @author Suage
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*/
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public
class SysConvert {
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//声明当前对象
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private
static SysConvert instance =
new SysConvert();
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//可用计数字符
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private
static String unit =
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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//输入数字
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private String number;
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//输入进制
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private
int sysIn;
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//输出进制
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private
int sysOut;
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//输入实际值
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private
double actualValue;
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//小数计算精度
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private
int precision;
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//用于存放结果
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private StringBuilder result =
new StringBuilder();
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private SysConvert() {
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}
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public static SysConvert getInstance() {
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return instance;
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}
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/**
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* 获取当前位所代表的值
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*
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* @param sys 进制数
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* @param index 距离小数点的距离
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* @param var 当前位表示字符
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* @return 当前位所代表的值
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*/
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private static double changeNI(int sys, int index, char var) {
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return unit.indexOf(var) * Math.pow(sys, index);
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}
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/**
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* 将值转化为对应进制表示字符
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*
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* @param sys 进制数
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* @param var 值
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* @return 对应进制表示字符
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*/
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private static char changeIN(int sys, int var) {
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return unit.charAt(var);
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}
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/**
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* 计算实际值
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*/
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private void calculateActualValue() {
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//检查小数点
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int pointIndex = number.indexOf(
'.');
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//计算整数部分
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if (pointIndex <
0) {
//如果没有小数部分
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for (
int i =
0; i < number.length(); i++) {
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actualValue += (
long) changeNI(sysIn, i, number.charAt(number.length() - i -
1));
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}
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}
else {
//有则
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for (
int i =
0; i < pointIndex; i++) {
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actualValue += (
long) changeNI(sysIn, i, number.charAt(pointIndex - i -
1));
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}
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}
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if (!(pointIndex <
0)) {
//如果有小数部分
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//计算小数部分
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for (
int i = pointIndex +
1; i < number.length(); i++) {
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actualValue += changeNI(sysIn, pointIndex - i, number.charAt(i));
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}
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}
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}
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/**
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* 转换为指定进制
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*/
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private void Convert() {
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//分离整数和小数
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long integerPart = (
long) actualValue;
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double decimalsPart = actualValue - integerPart;
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//建立字符串以用于保存结果
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while (integerPart >= sysOut) {
//反复除进制,取余数
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result.insert(
0, changeIN(sysOut, (
int) (integerPart % sysOut)));
//追加结果
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integerPart = integerPart / sysOut;
//商
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}
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if (integerPart !=
0) {
//如果最后未被除尽
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result.insert(
0, changeIN(sysOut, (
int) integerPart));
//追加结果
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}
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if (decimalsPart >
0) {
//如果有小数部分
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//添加小数点
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result.append(
".");
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for (
int t =
0; t < precision; t++) {
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decimalsPart = decimalsPart * sysOut;
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result.append(changeIN(sysOut, (
int) decimalsPart));
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decimalsPart = decimalsPart - (
int) decimalsPart;
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}
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}
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}
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/**
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* 进制转换
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*
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* @param sysIn 输入进制(Input base)
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* @param sysOut 输出进制(Output base)
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* @param number 输入数字(Input number)
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* @param precision 输出精度(非小数此参数无效)(Output precision (non-decimal this parameter is not valid))
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* @return 输出转换结果
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*/
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public String Convert(int sysIn, int sysOut, String number, int precision) {
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this.sysIn = sysIn;
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this.sysOut = sysOut;
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this.number = number;
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this.precision = precision;
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actualValue =
0;
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result.delete(
0, result.length());
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calculateActualValue();
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Convert();
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return result.toString();
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}
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}
测试用源码(SysConvertTest.java):
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public
class SysConvertTest {
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public static void main(String[] args) {
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SysConvert sysConvert = SysConvert.getInstance();
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String result;
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//16进制转20进制
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result = sysConvert.Convert(
16,
20,
"ABC.DEF",
10);
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System.out.println(result);
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//10进制转16进制
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result = sysConvert.Convert(
10,
16,
"1111.9999",
10);
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System.out.println(result);
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}
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}
控制台输出:
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6
H8
.H86FIF0000
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457
.FFF9724745
转载：https://blog.csdn.net/qq_33766294/article/details/105716260
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