Replace New ArrayList to Old ArrayList in Android with New Size and Data

Here Some solution for how to copy or replace new arraylist to previous or old arraylist, with costmize new array size or data.

public class MainActivity extends Activity {



ArrayList<String> s = new ArrayList<String>();

ArrayList<String> f = new ArrayList<String>();



@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);



s.add("Nepal");

s.add("Korea");

s.add("Sri Lanka");

s.add("India");

s.add("Pakistan");

s.add("China");

s.add("Australia");

s.add("Bhutan");


f.add("London");

        f.add("New York");

        f.add("Mumbai");

        f.add("Kathamndu");

      

// first clear the array otherwise you are adding old array

        s.clear();

        s.addAll(f);

for(int i=0;i<s.size();i++){

   Log.d("TAG", "Sources---" + s.get(i));

   Log.d("TAG", "Destination---" + f.get(i));

}

}

}