What is Parse parsing

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In Java  What exactly is Parsing   Why are they used   For example  Integer parseInt       and parsing a string

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From dictionary reference com      Computers  to analyze  a string of   characters  in order to associate   groups of characters with the   syntactic units of the underlying   grammar    The context of the definition is the translation of program text or a language in the general sense into its component parts with respect to a defined grammar -- turning program text into code   In the context of a particular language keyword  though  it generally means to convert the string value of a fundamental data type into an internal representation of that data type  For example  the string  10  becomes the number  integer  10

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Parsing means we are analyzing an object specifically  For example  when we enter some keywords in a search engine  they parse the keywords and give back results by searching for each word  So it is basically taking a string from the file and processing it to extract the information we want   Example of parsing using indexOf to calculate the position of a string in another string   String s  What a Beautiful day     int i s indexOf  day     value of i would be 17 int j s indexOf  be     value of j would be -1 int k s indexOf  ea     value of k would be 8   paresInt essentially converts a String to a Integer   String s  9876543   int a new Integer s    uses constructor System out println  Constructor method      a   a Integer parseInt s    uses parseInt   method System out println  parseInt   method      a     Output    Constructor method  9876543  parseInt   method  9876543

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You could say that parsing a string of characters is analyzing this string to find tokens  or items and then create a structure from the result   In your example  calling Integer parseInt on a string is parsing this string to find an integer   So  if you have    String someString    123     And then you invoke   int i   Integer parseInt  someString      You re telling java to analyze the  123  string and find an integer there    Other example   One of the actions the java compiler does  when it compiles your source code is to  parse  your  java file and create tokens that match the java grammar    When you fail to write the source code properly   for instance forget to add a   at the end of a statement    it is the parser who identifies the error   Here s more information  http   en wikipedia org wiki Parse

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Parsing is the division of text in to a set of parts or tokens

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Parsing is just process of analyse the string of character and find the tokens from that string and parser is a component of interpreter and compiler It uses lexical analysis and then syntactic analysis It parse it and then compile this code after this whole process of compilation

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Parsing is to read the value of one object to convert it to another type  For example you may have a string with a value of  10   Internally that string contains the Unicode characters  1  and  0  not the actual number 10  The method Integer parseInt takes that string value and returns a real number   String tenString    10     This won t work since you can t add an integer and a string Integer result   20   tenString     This will set result to 30 Integer result   20   Integer parseInt tenString

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Parsing can be considered as a synonym of  Breaking down into small pieces  and then analysing what is there or using it in a modified way  In Java  Strings are parsed into Decimal  Octal  Binary  Hexadecimal  etc  It is done if your application is taking input from the user in the form of string but somewhere in your application you want to use that input in the form of an integer or of double type  It is not same as type casting  For type casting the types used should be compatible in order to caste but nothing such in parsing

[java] What is Parse/parsing?

Examples related to java

Examples related to parsing