Skip to main content

Multiple ArrayList in Java

Like Multiple array also we can create and use multiple arraylist.

Declaration of Multiple ArrayList in JAVA.

ArrayList<integer> sets[];

initialization of Multiple ArrayList in JAVA.

sets = new ArrayList[5];

Sample program using Multiple ArrayList in JAVA.

public class A {
static ArrayList<integer> numbers[];

public static void main(String[] args) throws ParseException {
numbers= new ArrayList[5];
numbers[0] = new ArrayList<integer>();
numbers[0].add(1);
// extending your code in order to use more than one value of the List array
numbers[1] = new ArrayList<integer>();
numbers[1].add(2);
numbers[1].add(3);
// if you want to get the values of first array.
for(int i = 0;i&ltnumbers[1].size();i++)
System.out.println(numbers[1].get(i));
// if you want to get the values of whole arraylist.
for(int j = 0; j&ltsets.length;j++)
for(int i = 0;i&ltnumbers[j].size();i++)
System.out.println(numbers[j].get(i));
}
}

Comments

Popular posts from this blog

Simple example of using Spinner in Kotlin | Android

Though Kotlin has lot massive features to speedup the development time, here is the simple way of using Spinner in Android. In Kotlin we don't need to declare and initialize Spinner. We can simply access the id of Spinner from xml. Ex : import android.os.Bundle import android.support.v7.app.AppCompatActivity import android.view.View import android.widget.AdapterView import android.widget.ArrayAdapter import android.widget.Toast import android.widget.Toast.LENGTH_LONG import kotlinx.android.synthetic.main.activity_main.* class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) //String array. val myStrings = arrayOf("One", "Two", "Three", "Four", "Five") //Adapter for spinner mySpinner.adapter = ArrayAdapter(this, android.R.layout.simple_spinner_dropdown_i...

Simple example of OCRReader in Android.

Hi Friends, Maybe you all heard/used text scanning using camera feature or extracting text from Image. But this sample made it very easy for you. You can made it in very simple line of code. You can download the source code from OCRSample and import the library as a module into your project. Example usage : MainActivity.java public class MainActivity extends AppCompatActivity { private TextView textView; private final int CAMERA_SCAN_TEXT = 0; private final int LOAD_IMAGE_RESULTS = 1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView = findViewById(R.id.textView); } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.menu_main, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSele...

Simple example of Navigation view on both side in Android

Hi guys, you can use NavigationView on both side if you want side menu in both left and right side in Android as following. Your drawer layout will be &lt?xml version="1.0" encoding="utf-8"?&gt &ltandroid.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" tools:openDrawer="start"&gt &ltinclude layout="@layout/app_bar_main" android:layout_width="match_parent" android:layout_height="match_parent" /&gt &ltandroid.support.design.widget.NavigationView android:id="@+id/nav_view" ...