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URL: https://dev.to/vidya_cdd37fca763a53a10e2/arraylist-methods-92b

⇱ ArrayList Methods - DEV Community

1.Adding Elements

ArrayList<String> list = new ArrayList<>();
list.add("Apple");
System.out.println(list); --> output:[Apple]

2.Accessing Elements

ArrayList<String> list = new ArrayList<>();
list.add("Apple");

String item = list.get(0);
System.out.println(item); -->output:Apple

3. Updating Elements

import java.util.ArrayList;

public class Demo {
 public static void main(String[] args) {

 ArrayList<String> list = new ArrayList<>();
 list.add("Apple");
 list.add("Banana");

 list.set(0, "Mango"); // replace element

 System.out.println(list);
 }
} 

output:[Mango, Banana]

4. Removing Elements

import java.util.ArrayList;

public class Demo {
 public static void main(String[] args) {

 ArrayList<String> list = new ArrayList<>();
 list.add("Apple");
 list.add("Banana");
 list.add("Mango");

 list.remove(0); // remove by index
 System.out.println(list);

 list.remove("Banana"); // remove by value
 System.out.println(list);

 list.clear(); // remove all
 System.out.println(list);
 }
}

 output:[Banana, Mango]
 [Mango]
 []

5. Size & Check

import java.util.ArrayList;

public class Demo {
 public static void main(String[] args) {

 ArrayList<String> list = new ArrayList<>();
 list.add("Apple");
 list.add("Banana");

 System.out.println(list.size()); // number of elements
 System.out.println(list.isEmpty()); // check empty
 System.out.println(list.contains("Apple"));// check element
 }
}

output:2
 false
 true

6. Searching

 import java.util.ArrayList;

public class Demo {
 public static void main(String[] args) {

 ArrayList<String> list = new ArrayList<>();
 list.add("Apple");
 list.add("Banana");
 list.add("Apple");

 System.out.println(list.indexOf("Apple")); // first index
 System.out.println(list.lastIndexOf("Apple")); // last index
 }
}

output:0
 2

7. Bulk Operations

import java.util.ArrayList;

public class Demo {
 public static void main(String[] args) {

 ArrayList<String> list = new ArrayList<>();
 list.add("Apple");
 list.add("Banana");
 list.add("Apple");

 System.out.println(list.indexOf("Apple")); // first index
 System.out.println(list.lastIndexOf("Apple")); // last index
 }
}

output:[Apple, Banana, Grapes]
 [Apple, Banana]
 [Grapes]