Groovy : tokenize() vs split()

14 / Mar / 2013 by Vivek Garg 3 comments
  1. The split() method returns a string [] instance and the  tokenize() method returns a list instance
  2.  tokenize() ,which returns a list, will ignore empty string (when a delimiter appears twice in  succession) where as split() keeps such string.
    String testString = 'hello brother'
    assert testString.split() instanceof String[]
    assert ['hello','brother']==testString.split() //split with no arguments
    assert['he','','o brother']==testString.split('l')
    // split keeps empty string
    assert testString.tokenize() instanceof List
    assert ['hello','brother']==testString.tokenize() //tokenize with no arguments
    assert ['he','o brother']==testString.tokenize('l')
    //tokenize ignore empty string
    
  3. The tokenize() method uses each character of a String as delimiter where as split()  takes the entire string as delimiter
    String  testString='hello world'
    assert ['hel',' world']==testString.split('lo')
    assert ['he',' w','r','d']==testString.tokenize('lo')
    
  4. The split() can take regex as delimiter where as tokenize does not.
    String testString='hello world 123 herload'
    assert['hello world ',' herload']==testString.split(/\d{3}/)
    

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