JAVA实现二进制和16进制之间的互相转换，8进制同理，附带异或操作实现

来源：互联网发布：像堆糖一样的软件编辑：程序博客网时间：2024/05/29 11:22

public static String bin2Hex(String binStr) {int deci = Integer.valueOf(binStr,2);return Integer.toHexString(deci);}public static String hex2Bin(String hexStr) {int deci = Integer.valueOf(hexStr,16);return Integer.toBinaryString(deci);}

public static void main(String args[]) {String str = "f012";System.out.println(hex2Bin(str));System.out.println(bin2Hex("01011011"));}

执行结果：

1111000000010010
5b

非常简单

8进制同理，转换

但是以上方法的缺陷是，16进制或2进制串很大时就转换失败，下面给出通用方法：

public static String bin2Hex(String binStr) {StringBuffer temp = null;while (binStr.length() % 4 != 0) {temp = new StringBuffer(binStr);temp.insert(0, "0");binStr = temp.toString();}StringBuffer sb = new StringBuffer();int deci = 0;for (int i = 0; i <= binStr.length() - 4; i += 4) {deci = Integer.valueOf(binStr.substring(i, i + 4), 2);sb.append(Integer.toHexString(deci));}return sb.toString();}

public static String hex2Bin(String hexStr) {StringBuffer sb = new StringBuffer();int deci = 0;StringBuffer temp = null;for (int i = 0; i < hexStr.length(); i++) {deci = Integer.valueOf(hexStr.charAt(i) + "", 16);temp = new StringBuffer(Integer.toBinaryString(deci));while (temp.length() < 4) {temp.insert(0, "0");}sb.append(temp);}return sb.toString();}

顺带来个异或操作：

public static String xor(String binStr1, String binStr2) {int len1 = binStr1.length();int len2 = binStr2.length();StringBuffer sb = new StringBuffer();if (len1 != len2) {return null;}for (int i = 0; i < len1; i++) {if (binStr1.charAt(i) == binStr2.charAt(i)) {sb.append("0");} else {sb.append("1");}}return sb.toString();}

public static void main(String args[]) {String str = "89451211512131";String str2 = "fd589213165131";String bin1 = hex2Bin(str);String bin2 = hex2Bin(str2);System.out.println(bin1.length() + "==" + bin2.length());System.out.println(bin2Hex(bin1));System.out.println(bin2Hex(bin2));String bin = xor(bin1,bin2);System.out.println(bin2Hex(bin));}

运行结果如下：

56==56
89451211512131
fd589213165131
741d8002477000

上述原理仍然是使用Integer.valueOf方法来实现的，只不过是分段转换

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