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Message: [QUOTE="Oscar Kind, post: 555351"] Remember that a binary string is a number with radix 2. Next, determine what you want to convert: a number (not a String; a String probably needs to be parsed into a number). Then, note that any (integer) number can be represented as a long, and look at the API for java.lang.Long: String binary = Long.toString(number, 2); long number = Long.parseLong(binary, 2); (note: this works slightly different with java.math.BigInteger) Now you only have to catch the esceptions and you're set. Oscar [/QUOTE]