YouTipJava Arraylist Clear
# Java ArrayList clear() Method
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The `clear()` method is used to remove all elements from a dynamic array.
The syntax of the `clear()` method is:
arraylist.clear()
**Note:** `arraylist` is an object of the ArrayList class.
**Parameter Description:**
* None
### Example
Using ArrayList `clear()` to remove all elements:
## Example
import java.util.ArrayList;
class Main {
public static void main(String[] args){
// Create an array
ArrayList sites =new ArrayList();
sites.add("Google");
sites.add("");
sites.add("Taobao");
System.out.println("Website List: "+ sites);
// Remove all elements
sites.clear();
System.out.println("After clear() method: "+ sites);
}
}
The output of the above program is:
Website List: [Google, , Taobao]After clear() method: []
In the example above, we created a dynamic array named `sites`. This dynamic array stores the names of websites.
At the end of the example, we used the `clear()` method to remove all elements from the dynamic array `sites`.
### clear() vs removeAll() Method
The dynamic array also provides the `removeAll()` method, which can also remove all elements from the array, as shown below:
## Example
import java.util.ArrayList;
class Main {
public static void main(String[] args){
// Create a dynamic array
ArrayList oddNumbers =new ArrayList();
// Add elements to the dynamic array
oddNumbers.add(1);
oddNumbers.add(3);
oddNumbers.add(5);
System.out.println("Odd Numbers ArrayList: "+ oddNumbers);
// Remove all elements
oddNumbers.removeAll(oddNumbers);
System.out.println("After using removeAll() method: "+ oddNumbers);
}
}
The output of the above program is:
Odd Numbers ArrayList: [1, 3, 5]After using removeAll() method: []
In the example above, we created a dynamic array named `oddNumbers`, and then used the `removeAll()` method to remove all elements from the array.
Both `removeAll()` and `clear()` methods have the same functionality. However, the `clear()` method is more commonly used than `removeAll()` because `clear()` is faster and more efficient than `removeAll()`.
To learn more about `removeAll()`, please visit [Java ArrayList removeAll() Method](#).
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