Groovy using the list collection

2. Gets the elements in the list collection
   
   

   def LST = [1,3,4,1,8,9,2,6]println lst[-1]println lst[-2] Output: output: 62

4. Use Range object to get several consecutive values in a collection
   
   

   Take value from left to right
   def LST = [1,3,4,1,8,9,2,6]println lst[2..5] Output Result: [4, 1, 8, 9]
   
   Value from right to left
   def LST = [1,3,4,1,8,9,2,6]println lst[-1..-4]

   Output results: [6, 2, 9, 8]

6. Iterative ArrayList
   
   

   Iterate from left to right in LST = [1,3,4,1,8,9,2,6]lst.each{print "${it},"} Output: 1,3,4,1,8,9,2,6,//iterates from right to left in the reverse direction of LST = [1,3,4,1,8,9,2,6] lst.each{print "${it},"} Output: 6,2,9,8,1,4,3,1,//Iteration Display index def LST = [1,3,4,1,8,9,2,6]lst.eachwithindex{it,i, print ( "${i},")} Output Result: 0,1,2,3,4,5,6,7,

8. Using the Collect method of list
   
   

   Finding the list element/*find () finds the first occurrence of the match object, and it iterates only until the closure returns true. The resulting True,find method stops the iteration and returns the current element. Returns null if the traversal ends and does not get true. */lst = [1,3,4,1,8,9,2,6]println lst.find{it > 4} output Result: 8//Find list element, return all eligible elements LST = [1,3,4,1,8,9,2,6]println lst.findall{it > 4} output result: [8,9,6]//Find list element, return element subscript lst = [1,3,4,1,8,9,2,6]println lst.findallindexof{it = = 4} output Result: 2

10. Sort by using list
    
    

    def ids = [5,6,3,7,1,4,9]  //Can be considered Comparator sort  ids.sort {a,b->      return-a.compareto (b)  }  println IDs  //Natural sort  ids.sort ();  println IDs output: [9, 7, 6, 5, 4, 3, 1][1, 3, 4, 5, 6, 7, 9]

12. List to go heavy
    
    

    LST = [1,3,1,1,8,9,2,6]println lst.unique () output result: [1, 3, 8, 9, 2, 6]

14. Link a list element to a string
    
    

    LST = [' Shun Fenghai ', ' is good ', ' only sell genuine ']println lst.join (') println lst.join (', ') output: Shun Fenghai is good only sell genuine shun Fenghai, is good, only sell authentic

16. Element substitution
    
    

    LST = [' Shun Fenghai ', ' is good ', ' sell only authentic ']lst[0] = [' sfht ', '. com ']println lst.flatten () output: [Sfht,. com, that's good, sell only authentic]

18. +/-Operator
    
    
    

    LST = [' Shun Fenghai ', ' is good ', ' only sell genuine ']println LST-[' is good '] output: [Shun Fenghai, only sell genuine]lst = [' Shun Fenghai ', ' is good ', ' sell genuine ']println lst + [' You say it '] output: [Shun Fung Sea Amoy, is good, only sells the genuine, you say?

20. List element Leveling
    
    

    LST = [[up], ' Shun Fenghai ', ' is good ', ' only sell authentic ']println lst.flatten () output: [1, 2, ' Shun Fenghai ', ' is good ', ' only sell genuine ']

Groovy using the list collection