Java 2 dimensional array

Question

@ Gouki Pls check if this is a correct Implementation as there may be multiple attributes in my row that has T,N or X -I basically want to check if the first attribute in every row for a value of T,N or X and do some business logic- Thanks

public void printarray(List<String[]> usersList) { for(String[] row: usersList) { System.out.println(row[0]); if(row[0].equals("N")){ System.out.println("Insert records in DB"); System.out.println("*********************"); System.out.println(row[1]+" , " + row[2]+" , "+row[3]+" , " + row[4]+" " +row[5]); } if(row[0].equals("T")){ System.out.println("Get date from DB and update DB based on the same"); System.out.println("*********************"); System.out.println(row[1]+" , " + row[2]+" , "+row[3]+" , " + row[4]+" " +row[5]); } if(row[0].equals("X")){ System.out.println("Update 2 sub tables"); System.out.println("*********************"); System.out.println(row[1]+" , " + row[2]+" , "+row[3]+" , " + row[4]+" " +row[5]); } } }

gouki · Accepted Answer · 2011-06-26 04:49:12Z

4

You can perhaps use a List as container for every row (which is an array).

List<String[]> userList = new ArrayList<String[]>();

and then on your while loop:

 while ((line = br.readLine()) != null) { String[] values = line.split(","); userList.add(values); }

To retrieve, modify your printarray :

public void printarray(List<String[]> usersList) { for(String[] row: usersList) { for(String element:row) { System.out.println(element); } } System.out.println(); }

edited Jun 26, 2011 at 4:49

answered Jun 26, 2011 at 3:30

gouki

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9 Comments

Marcelo Over a year ago

Why don't you put values directly into userList?

trashgod Over a year ago

Also consider List<List<String>>.

gouki Over a year ago

@marcelo, you're right, i overlooked that. Will update answer

user549432 Over a year ago

@ In ur updated answe pls help me with populating in userlist itself and retrieving it as well Thanks a lot for your help

gouki Over a year ago

@user549432 , I've updated the answer to demonstrate how to retrieve the data from the list. It functions just the same as your original method (print the elements)

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