Type error occurs due to mismatch of data type. In this example, Arraylist is of Integer type - ArrayList<Integer>
Data Apple and Cherry are String type. So When you try to add String data into Integer type ArrayList, it will generate error.

In the same way when you try to add integer data into String type ArrayList ,error occurs.

Whenever you declare Arraylist type beware in the time of adding data.

import java.util.*;
public class ArraylistTypeError {
  public static void main(String[] args) {
  ArrayList<Integer> list = new ArrayList<Integer>();


  list.add("Apple");
  list.add("Cherry");

 System.out.println(list);
}
}