java 二进制数字符串转换工具类
- 将二进制转换成八进制
- 将二进制转换成十进制
- 将二进制转换成十六进制
- 将十进制转换成二进制
package com.iteye.injavawetrust.ad;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* 二进制转换工具类
* <ul>
* <li>将二进制转换成八进制</li>
* <li>将二进制转换成十进制</li>
* <li>将二进制转换成十六进制</li>
* <li>将十进制转换成二进制</li>
* </ul>
*
* @author InJavaWeTrust
*/
public class BinaryUtil {
/**
* 将二进制整数部分转换成十进制
* @param inteter 二进制整数部分字符串
* @return 转换后的十进制数值
*/
public static int binaryIntToDecimalism(String inteter) {
int inteterSum = 0;
for (int i = inteter.length(); i > 0; i--) {
int scale = 2;
if (inteter.charAt(-(i - inteter.length())) == '1') {
if (i != 1) {
for (int j = 1; j < i - 1; j++) {
scale *= 2;
}
} else {
scale = 1;
}
} else {
scale = 0;
}
inteterSum += scale;
}
return inteterSum;
}
/**
* 将二进制小数部分转换成十进制
* @param decimals 二进制小数部分字符串
* @return 转换后的十进制数值
*/
public static double binaryDecToDecimalism(String decimals) {
double decimalsSum = 0f;
for (int i = 0; i < decimals.length(); i++) {
double scale = 2;
if (decimals.charAt(i) == '1') {
if (i == 0) {
scale = 1 / scale;
} else {
for (int j = 1; j <= i; j++) {
scale *= 2;
}
scale = 1 / scale;
}
} else {
scale = 0;
}
decimalsSum += scale;
}
return decimalsSum;
}
/**
* 将二进制转换成十进制
* @param binary 二进制字符串
* @return 转换后的十进制字符串
*/
public static String binaryToDecimalism(String binary) {
String sum = "";
String integer = ""; // 整数部分
String decimals = ""; // 小数部分
int integerSum = 0; // 整数部分和
double decimalsSum = 0d; // 小数部分和
if (BinaryUtil.isBinary(binary)) {
if (BinaryUtil.isContainsPoint(binary)) {
integer = binary.substring(0, binary.indexOf("."));
decimals = binary.substring(binary.indexOf(".") + 1,
binary.length());
integerSum = BinaryUtil.binaryIntToDecimalism(integer);
decimalsSum = BinaryUtil.binaryDecToDecimalism(decimals);
sum = String.valueOf(integerSum + decimalsSum);
} else {
integerSum = BinaryUtil.binaryIntToDecimalism(binary);
sum = String.valueOf(integerSum);
}
} else {
try {
throw new IllegalBinaryException(binary + " Illegal binary!");
} catch (IllegalBinaryException be) {
System.out.println(be.getMessage());
}
}
return sum;
}
/**
* 将二进制整数部分转换成八进制
* @param integer 二进制字符串
* @return 转换后的八进制字符串
*/
public static String binaryIntToOctal(String integer) {
StringBuilder integerSum = new StringBuilder();
int loop = 0; // 循环次数
if (integer.length() % 3 == 0) {
loop = integer.length() / 3;
} else {
loop = integer.length() / 3 + 1;
}
String binary = "";
for (int i = 1; i <= loop; i++) {
if (i != loop) {
binary = integer.substring(integer.length() - i * 3,
integer.length() - i * 3 + 3);
} else {
binary = BinaryUtil.appendZero(
integer.substring(0, integer.length() - (i - 1) * 3),
3, true);
}
integerSum.append(BinaryUtil.binaryIntToDecimalism(binary));
}
return integerSum.reverse().toString();
}
/**
* 将二进制小数部分转换成八进制
* @param xs 二进制字符串
* @return 转换后的八进制字符串
*/
public static String binaryDecToOctal(String decimals) {
StringBuilder decimalsSum = new StringBuilder();
int loop = 0; // 循环次数
if (decimals.length() % 3 == 0) {
loop = decimals.length() / 3;
} else {
loop = decimals.length() / 3 + 1;
}
String binary = "";
for (int i = 1; i <= loop; i++) {
if (i != loop) {
binary = decimals.substring(3 * (i - 1), 3 * (i - 1) + 3);
} else {
binary = BinaryUtil.appendZero(decimals.substring(3 * (i - 1)),
3, false);
}
decimalsSum.append(BinaryUtil.binaryIntToDecimalism(binary));
}
return decimalsSum.toString();
}
/**
* 将二进制转换成八进制
* @param binary 二进制字符串
* @return 转换后的八进制字符串
*/
public static String binaryToOctal(String binary) {
String integer = "";
String point = "";
String decimals = "";
String integerSum = "";
String decimalsSum = "";
if (BinaryUtil.isBinary(binary)) {
if (BinaryUtil.isContainsPoint(binary)) {
integer = binary.substring(0, binary.indexOf("."));
point = ".";
decimals = binary.substring(binary.indexOf(".") + 1,
binary.length());
integerSum = BinaryUtil.binaryIntToOctal(integer);
decimalsSum = BinaryUtil.binaryDecToOctal(decimals);
} else {
integerSum = BinaryUtil.binaryIntToOctal(binary);
}
} else {
try {
throw new IllegalBinaryException(binary + " Illegal binary!");
} catch (IllegalBinaryException be) {
System.out.println(be.getMessage());
}
}
StringBuilder sum = new StringBuilder();
sum = sum.append(integerSum).append(point).append(decimalsSum);
return sum.toString();
}
/**
* 将二进制整数部分转换成十六进制
* @param integer 二进制整数部分字符串
* @return 转换后的十六进制字符串
*/
public static String binaryIntToHexadecimal(String integer) {
StringBuffer integerSum = new StringBuffer();
int loop = 0; // 循环次数
if (integer.length() % 4 == 0) {
loop = integer.length() / 4;
} else {
loop = integer.length() / 4 + 1;
}
String binary = "";
for (int i = 1; i <= loop; i++) {
if (i != loop) {
binary = integer.substring(integer.length() - i * 4,
integer.length() - i * 4 + 4);
} else {
binary = BinaryUtil.appendZero(
integer.substring(0, integer.length() - (i - 1) * 4),
4, true);
}
integerSum.append(BinaryUtil.toHex(String.valueOf(BinaryUtil
.binaryIntToDecimalism(binary))));
}
return integerSum.reverse().toString();
}
/**
* 将二进制小数部分转换成十六进制
* @param xs 二进制字符串
* @return 转换后的十六进制字符串
*/
public static String binaryDecToHexadecimal(String decimals) {
StringBuffer decimalsSum = new StringBuffer();
int loop = 0;
if (decimals.length() % 3 == 0) {
loop = decimals.length() / 3;
} else {
loop = decimals.length() / 3 + 1;
}
String binary = "";
for (int i = 1; i <= loop; i++) {
if (i != loop) {
binary = decimals.substring(4 * (i - 1), 4 * (i - 1) + 4);
} else {
binary = BinaryUtil.appendZero(decimals.substring(4 * (i - 1)),
4, false);
}
decimalsSum.append(BinaryUtil.toHex(String.valueOf(BinaryUtil
.binaryIntToDecimalism(binary))));
}
return decimalsSum.toString();
}
/**
* 将二进制转换成十六进制
* @param binary 二进制字符串
* @return 转换后的十六进制字符串
*/
public static String binaryToHexadecimal(String binary) {
String integer = "";
String point = "";
String decimals = "";
String integerSum = "";
String decimalsSum = "";
if (BinaryUtil.isBinary(binary)) {
if (BinaryUtil.isContainsPoint(binary)) {
integer = binary.substring(0, binary.indexOf("."));
point = ".";
decimals = binary.substring(binary.indexOf(".") + 1,
binary.length());
integerSum = BinaryUtil.binaryIntToHexadecimal(integer);
decimalsSum = BinaryUtil.binaryDecToHexadecimal(decimals);
} else {
integerSum = BinaryUtil.binaryIntToHexadecimal(binary);
}
} else {
try {
throw new IllegalBinaryException(binary + " Illegal binary!");
} catch (IllegalBinaryException be) {
System.out.println(be.getMessage());
}
}
StringBuilder sum = new StringBuilder();
sum = sum.append(integerSum).append(point).append(decimalsSum);
return sum.toString();
}
/**
* 将十进制整数部分转换成二进制
* @param integer 十进制整数部分
* @return 转换后的二进制
*/
public static String decimalismIntToBinary(String integer) {
return Integer.toBinaryString(Integer.parseInt(integer)).toString();
}
/**
* 将十进制小数部分转换成二进制
* @param sxs 十进制整小数部分
* @return 转换后的二进制
*/
public static String decimalismDecToBinary(String decimals) {
String pre = "0.";
String all = pre + decimals;
String sum = "";
double dou = Double.parseDouble(all);
while (!String.valueOf(dou).equals("0.0")) {
dou = dou * 2;
sum += String.valueOf(dou).substring(0,
String.valueOf(dou).indexOf("."));
dou = Double.parseDouble("0."
+ String.valueOf(dou).substring(
String.valueOf(dou).indexOf(".") + 1));
}
return sum;
}
/**
* 将十进制转换成二进制
* @param decimalism 十进制数字符串
* @return 转换后的二进制数字符串
*/
public static String decimalismToBinary(String decimalism) {
String binary = "";
String point = "";
String integer = "";
String decimals = "";
if (BinaryUtil.isNumber(decimalism)) {
if (BinaryUtil.isContainsPoint(decimalism)) {
integer = decimalism.substring(0, decimalism.indexOf("."));
integer = BinaryUtil.decimalismIntToBinary(integer);
point = ".";
decimals = decimalism.substring(decimalism.indexOf(".") + 1);
decimals = BinaryUtil.decimalismDecToBinary(decimals);
} else {
integer = BinaryUtil.decimalismIntToBinary(decimalism);
}
} else {
try {
throw new IllegalNumberException(decimalism
+ " Illegal number!");
} catch (IllegalNumberException be) {
System.out.println(be.getMessage());
}
}
binary = integer + point + decimals;
return binary;
}
/**
* 将10~15转换成A~F
* @param binary 十六进制字符串
* @return 转换后的十六进制数值
*/
public static String toHex(String hex) {
String str = "";
switch(Integer.parseInt(hex)){
case 10 : str = "A"; break;
case 11 : str = "B"; break;
case 12 : str = "C"; break;
case 13 : str = "D"; break;
case 14 : str = "E"; break;
case 15 : str = "F"; break;
default : str = hex;
}
return str;
}
/**
* 根据补位标志将源字符串补位到指定长度
* @param str 源字符串
* @param len 补位到指定长度
* @param flag 补位标志 true-左补;false-右补
* @return 补位后的字符串
*/
public static String appendZero(String str, int len, boolean flag) {
String zero = "0";
if (null == str || str.length() == 0) {
return "";
}
if (str.length() >= len) {
return str;
}
for (int i = str.length(); i < len; i++) {
if (flag) {
str = zero + str;
} else {
str += zero;
}
}
return str;
}
/**
* 是否合法二进制字符串
* @param binary 二进制字符串
* @return true-合法;false-不合法
*/
public static boolean isBinary(String binary) {
boolean flag = true;
if (binary.contains(".")) {
if (binary.lastIndexOf(".") + 1 == binary.length()) {
return false;
} else if (binary.indexOf(".") == 0) {
return false;
}
char[] c = binary.toCharArray();
int sum = 0;
for (int i = 0; i < c.length; i++) {
if (c[i] == '.') {
sum += 1;
} else {
if (c[i] != '0' && c[i] != '1') {
return false;
}
}
if (sum > 1) {
return false;
}
}
} else {
char[] c = binary.toCharArray();
for (int i = 0; i < c.length; i++) {
if (c[i] != '0' && c[i] != '1') {
return false;
}
}
}
return flag;
}
/**
* 是否包含小数点
* @param number 字符串
* @return true-包含;false-不包含
*/
public static boolean isContainsPoint(String number) {
return number.contains(".") ? true : false;
}
/**
* 判断是否数字
* @param number 要判断的数字
* @return true-数字;false-非数字
*/
public static boolean isOToN(String number) {
Pattern p = Pattern.compile("\\d");
Matcher m = p.matcher(number);
return m.matches();
}
/**
* 判断是否是一个合法的数字
* @param number 要判断是数字
* @return true-合法数字;false-非法数字
*/
public static boolean isNumber(String number) {
boolean flag = true;
if (number.contains(".")) {
if (number.lastIndexOf(".") + 1 == number.length()) {
return false;
} else if (number.indexOf(".") == 0) {
return false;
}
char[] c = number.toCharArray();
int sum = 0;
for (int i = 0; i < c.length; i++) {
if (c[i] == '.') {
sum += 1;
} else {
if (!BinaryUtil.isOToN(String.valueOf(c[i]))) {
return false;
}
}
if (sum > 1) {
return false;
}
}
} else {
char[] c = number.toCharArray();
for (int i = 0; i < c.length; i++) {
if (!BinaryUtil.isOToN(String.valueOf(c[i]))) {
return false;
}
}
}
return flag;
}
public static void main(String[] args) throws Exception {
String binary = "110011";
System.out.println(BinaryUtil.binaryToDecimalism(binary));
System.out.println(BinaryUtil.binaryToOctal(binary));
System.out.println(BinaryUtil.binaryToHexadecimal(binary));
String integer = "51";
System.out.println(BinaryUtil.decimalismToBinary(integer));
String bin = "101011.101";
System.out.println(BinaryUtil.binaryToDecimalism(bin));
System.out.println(BinaryUtil.binaryToOctal(bin));
System.out.println(BinaryUtil.binaryToHexadecimal(bin));
String inte = "43.625";
System.out.println(BinaryUtil.decimalismToBinary(inte));
}
}
package com.iteye.injavawetrust.ad;
/**
* 非法的数字异常类
*
* @author InJavaWeTrust
*/
public class IllegalNumberException extends Exception{
private static final long serialVersionUID = 1L;
public IllegalNumberException(){
}
public IllegalNumberException(String message){
super(message);
}
}
package com.iteye.injavawetrust.ad;
/**
* 非法的二进制数异常类
*
* @author InJavaWeTrust
*/
public class IllegalBinaryException extends Exception{
private static final long serialVersionUID = 1L;
public IllegalBinaryException(){
}
public IllegalBinaryException(String message){
super(message);
}
}
