how to check for invalid characters public static String binaryStringToOctalString(String binString) { if (binString == null
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how to check for invalid characters
public static String binaryStringToOctalString(String binString) {
if (binString == null || binString.length() == 0) {
return null;
}
if(binString.charAt(0)<'0' || binString.charAt(0)>'1'){// else check my 0 the char is valid
return null;
}
int dec = Integer.parseInt(binString, 2);
return Integer.toOctalString(dec);
}
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