float float new float( ) floatvaluedouble double new double( ) doublevaluestring objects string is sequence of characters that comes from some alphabet (the set of all possible characterseach character that makes up string can be referenced by its index in the stringwhich is equal to the number of characters that come before in (so the first character is at index in javathe alphabet used to define strings is the unicode international character seta -bit character encoding that covers most used written languages other programming languages tend to use the smaller ascii character set (which is proper subset of the unicode alphabet based on -bit encodingin additionjava defines special built-in class of objects called string objects for examplea string could be "hogs and dogs"which has length and could have come from someone' web page in this casethe character at index is 'gand the character at index is 'aalternatelyp could be the string "cgtaatagttaatccg"which has length and could have come from scientific application for dna sequencingwhere the alphabet is {gcatconcatenation string processing involves dealing with strings the primary operation for combining strings is called concatenationwhich takes string and string combines them into new stringdenoted qwhich consists of all the characters of followed by all the characters of in javathe "+operation