how to declare and insert value to arraylist in same line in java

In Java, you can declare and insert values into an ArrayList in the same line using the add method and the Arrays.asList method.

For example, consider the following code that declares an ArrayList of strings and inserts three values into it:

import java.util.ArrayList;
import java.util.Arrays;

ArrayList<String> list = new ArrayList<>(Arrays.asList("apple", "banana", "cherry"));

The Arrays.asList method returns a fixed-size list backed by the specified array. The add method adds the elements of the list returned by Arrays.asList to the ArrayList.

You can also use this syntax to declare an ArrayList and insert values into it in a single line of code:

ArrayList<String> list = new ArrayList<>(Arrays.asList("apple", "banana", "cherry"));

This creates an ArrayList with the elements "apple", "banana", and "cherry".

Note that this syntax is only suitable for inserting a small number of values into the ArrayList. If you need to insert a large number of values, it is more efficient to use the add method in a loop.

For example:

ArrayList<String> list = new ArrayList<>();
for (int i = 0; i < 100; i++) {
   list.add("Value " + i);
}

This will insert 100 values into the ArrayList.