YouTipJava Arraylist Foreach
# Java ArrayList forEach() Method
[ Java ArrayList](#)
The forEach() method is used to iterate over each element in a dynamic array and perform a specific operation.
The syntax for the forEach() method is:
arraylist.forEach(Consumer action)
**Note:** arraylist is an object of the ArrayList class.
**Parameter Description:**
* action - The operation to perform on each element.
### Return Value
No return value.
### Example
Multiply all elements by 10:
## Example
import java.util.ArrayList;
class Main {
public static void main(String[] args){
// Create an array
ArrayList numbers =new ArrayList();
// Add elements to the array
numbers.add(1);
numbers.add(2);
numbers.add(3);
numbers.add(4);
System.out.println("ArrayList: "+ numbers);
// Multiply all elements by 10
System.out.print("Updated ArrayList: ");
// Pass lambda expression to forEach
numbers.forEach((e)->{
e = e *10;
System.out.print(e +" ");
});
}
}
The output of the above program is:
ArrayList: [1, 2, 3, 4]Updated ArrayList: 10 20 30 40
In the example above, we created a dynamic array named numbers.
Note this line:
numbers.forEach((e) -> { e = e * 10; System.out.print(e + " "); });
In the example above, we passed an anonymous function lambda expression as a parameter to the forEach() method. The lambda expression multiplies each element in the dynamic array by 10 and then prints the result.
For more information about lambda expressions, please visit (#) Expressions.
**Note:** The forEach() method is different from the for-each loop. (#) is used to iterate over each element in an array.
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