What is the best way to store multiple lists in Java?

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I am extracting data using some xyz logic. After extraction I am getting multiple list in each iteration.

   for (int i= 0; i<= 5; i++) 
   {
          for (int j= 0; j<= 5; j++) 
          {
              //data extraction logic
             lList1.add(value1);
             lList2.add(value2);
             lList3.add(value3);
          }
         //in each iteration I am getting list different 
          System.out.println(" lList1 for iteration "+i+"is: "+lList1);
          System.out.println(" lList2 for iteration "+i+"is: "+lList2);
          System.out.println(" lList3 for iteration "+i+"is: "+lList3);
   }

I need to pass these list to database. Each list is associated with one column in db. Example: lList1 is for column1, lList2 is for column2, lList3 is for column3 etc

What is best way to pass these list to db or to write these values row by row in java output should be like

row 1 lList1 lList2 lList3 etc of first iteration list values row 2 lList1 lList2 lList3 etc of second iteration list values etc

Can anyone help?


Create a class which will contain three members col1,col2 and col3 and make list of that class and use it.

class MyRow
{
public {col1datatype} col1;
public {col2DataType} col2;
public {col3DataType} col3;
}

your function

 List<MyRow> lstRows = new ArrayList<MyRow>();

         for (int i= 0; i<= 5; i++) 
           {
                  for (int j= 0; j<= 5; j++) 
                  {
                    MyRow row = new MyRow(); 
                     row.col1 = value1;
                     row.col2 = value2;
                     row.col3 = value3;
                     llstRows.Add(row); 
                  }
            }

And use that lstRows accordingly at database transaction.

Concatenate Multiple Lists in Java, In this article, several methods to concatenate multiple lists in Java into a single list are List.addAll(Collection) method concatenates all elements of the specified This technique should be best avoided as it costs an extra class at each� java.util.Vector is used to implement the vector class; Now we define a class and within it we define vector and also an object of another class called Person; Now the Person object is made to store basic info like name and id. And we use vector to store this information in easy manner


You can use Multidimensional Collections

ArrayList<ArrayList<Object>> a = new ArrayList<ArrayList<Object>>();

Result can be like that (based on your logic):

Multidimensional ArrayList: [[3, 4], [12, 13], [22, 23], [33,23]]

here is a full example :

ArrayList<ArrayList<Object>> list = new ArrayList<ArrayList<Object>>(); 
for (int i= 0; i<= 5; i++) {
    //if you got all the values 
    list.add(new ArrayList<Object>(Arrays.asList(value1, value2, value3))); 
    //else you have to fetch them from another loop
   for (int j= 0; j<= 5; j++) {
            list.add(new ArrayList<Object>()); 
            list.get(j).add(value1); 
          }
   }

Add Multiple Items to an Java ArrayList, In this quick tutorial, we'll show to how to add multiple items to an already initialized ArrayList. For an introduction to the use of the ArrayList,� Iterating the List: There are multiple ways to iterate through the List. The most famous ways are by using the basic for loop in combination with a get () method to get the element at a specific index and the advanced for loop.


2 Example to Merge or Join Multiple List in Java , By using addAll() method you can add contents from as many List as you want, it's best way to combine multiple List. One thing to remember is� Create an ArrayList object called cars that will store strings: import java.util.ArrayList; // import the ArrayList class ArrayList<String> cars = new ArrayList<String>(); // Create an ArrayList object. If you don't know what a package is, read our Java Packages Tutorial.


I would suggest in that case to serialize it to Json and store it in the column (since you use this approach with columns for lists).

When retrieving data from the DB, you can just deserialize it from Json to a List object.

For example Entity Framework is doing the same in .NET

Add multiple items to ArrayList in Java, To add all items from another collection to arraylist, use ArrayList.addAll() method . ArrayListExample.java. public class ArrayListExample. This method uses Java 8 stream API. We create a stream of elements from first list, add filter to get the desired elements only, and then collect filtered elements to another list. We create a stream of elements from first list, add filter to get the desired elements only, and then collect filtered elements to another list.


if all list contains same length then make one common function for all ArrayList and iterate it with the loop of the maximum size ArrayList: It should be like: for(int i=0;i<lList1.size();i++) { String insertQueryMainProduct = "INSERT INTO " + "" + tableName + "" + "(ColumnOneName,ColumnSecondName,ColumnThirdName)" + " VALUES('" +lList1.get(i)+ "', '" + lList2.get(i)+ "', '" + lList3.get(i)+ "')"; System.out.println("Query: " + insertQueryMainProduct); statement.executeUpdate(insertQueryMainProduct); Hope this will help you

Java Array of ArrayList, ArrayList of Array, Today we will learn how to create a Java array of ArrayList. type of objects in the array or you want to create an ArrayList of arrays that can hold multiple types, � There are many different ways to create objects in Java. Following are some ways in which you can create objects in Java: 1) Using new Keyword : Using new keyword is the most basic way to create an object. This is the most common way to create an object in java. Almost 99% of objects are created in this way.


Can you store multiple data types in an Array, How to store multiple datatypes in an array? interview questions and answers c# store different data types in an Array, better use System.Collections.ArrayList. Java List tutorial and examples for beginners. In this Java list tutorial, I will help you understand the characteristics of list collections, how to use list implementations (ArrayList and LinkedList) in day-to-day programming and look at various examples of common programming practices when using lists.


How to store multiple lists in a single list variable?, I want to store multiple lists in a single list variable and give a name for each list… Just like creating list array in java, we declare only 1 variable and create Surely there are better ways to do this, but it's just a quick idea. So we can say that heterogeneous tuple using a standard data structure is not possible in Java. 2.1. Comparison of Tuples vs Lists/Arrays A tuple is often compared with List as it looks very much like a list. But they differ in some aspects. A tuple is an object that can contain heterogeneous data. Lists are designed to store elements of a


Java List Collection Tutorial and Examples, Java List tutorial and examples for beginners. A list can store objects of any types. The following class diagram depicts the primary methods defined in the of the variable on the left based on the object type on the right side. Beacause list is interface we can use multiple classes with list interface. Java File IO Operations Sample Code Examples. All file operations. Show list of all file names from a folder. How to get list of all files from a folder? Filter the files by file extensions and show the file names. How to read file content using byte array? How to read file content line by line in java? How to read property file in static context?