how to add string to array in java

To add a string to an array in Java, you can use the add method of the ArrayList class or the Arrays.copyOf method to create a new array and copy the elements.

Here's an example of how you could use the add method of the ArrayList class to add a string to an array:

import java.util.ArrayList;

public class Main {
  public static void main(String[] args) {
    ArrayList<String> list = new ArrayList<>();
    list.add("hello");
    list.add("world");
    String[] words = list.toArray(new String[0]);
    System.out.println(Arrays.toString(words));
  }
}

In this example, the ArrayList object named list is initialized with no elements. The add method is then used to add two strings to the list. The toArray method is used to convert the list to an array of strings, and the result is assigned to the words variable. Finally, the Arrays.toString method is used to print the words array as a string.

The output of this example would be the following array:

[hello, world]

Keep in mind that the ArrayList class is part of the java.util package, which is included in the standard Java SE library. You can use a similar approach to add other types of objects to an array, by replacing the generic type String with the appropriate type.

Alternatively, you can use the Arrays.copyOf method to create a new array and copy the elements manually. Here's an example of how you could use the Arrays.copyOf method to add a string to an array:

import java.util.Arrays;

public class Main {
  public static void main(String[] args) {
    String[] words = new String[] {"hello"};
    words = Arrays.copyOf(words, words.length + 1);
    words[words.length - 1] = "world";
    System.out.println(Arrays.toString(words));
  }
}

In this example, the words array is initialized with a single element using an array literal. The Arrays.copyOf method is then used to create a new array with a length one element longer than the original array, and the result is assigned to the words variable.