[Term Entry] Java ArrayList .removeAll()

content/java/concepts/array-list/terms/removeAll/removeAll.md

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+---
+Title: '.removeAll()'
+Description: 'Removes multiple elements from an ArrayList.'
+Subjects:
+  - 'Code Foundations'
+  - 'Computer Science'
+Tags:
+  - 'Arrays'
+  - 'Data Types'
+  - 'Java'
+CatalogContent:
+  - 'learn-java'
+  - 'paths/computer-science'
+---
+
+The **`.removeAll()`** method is used for removing multiple elements from instances of the `ArrayList` class.
+
+## Syntax
+
+A collection of elements, specified by `Collection c`, can be removed from an `ArrayList` instance using the `.removeAll()` method:
+
+```pseudo
+arrayListInstance.removeAll(Collection c);
+```
+
+## Example
+
+In the example below, two `ArrayList` instances, `fallMonths` and `monthsToRemove`, are created to hold `String`-type elements. Elements are added to the `fallMonths` using the [`.add()`] method (https://www.codecademy.com/resources/docs/java/array-list/add). Then, `monthsToRemove` is utilized to remove the months - August and September from `fallMonths` using `.removeAll()`. Finally, all elements are removed from `fallMonths` by invoking `.removeAll()` with a reference to itself.
+
+```java
+import java.util.ArrayList;
+
+public class RemoveFallMonths{
+  public static void main(String[] args) {
+
+    ArrayList<String> fallMonths = new ArrayList<String>();
+
+    fallMonths.add("August");
+    fallMonths.add("September");
+    fallMonths.add("October");
+    fallMonths.add("November");
+    fallMonths.add("December");
+
+    ArrayList<String> monthsToRemove = new ArrayList<String>();
+
+    monthsToRemove.add("August");
+    monthsToRemove.add("December");
+
+    // Remove August and December from fallMonths using monthsToRemove
+    fallMonths.removeAll(monthsToRemove);
+
+    System.out.println("After removing specified months: " + fallMonths);```
+
+    // Remove all elements from fallMonths
+    fallMonths.removeAll(fallMonths);
+
+System.out.println("After removing all elements: " + fallMonths);```
+  }
+}
+```
+
+The `RemoveFallMonths` output should look like this:
+
+```shell
+[September, October, November]
+[]
+```