In this post under Java Collections, I will explain with example the purpose of “fill” static method in “Collections” utility class.
This method takes any list as input and replace all the elements of the list with user given object.
So if we have a list named “entries” containing below elements
[1, 2, 3, 4, 5]
The below method call
Collections.fill(entries, 6);
The output will be
Output
[6, 6, 6, 6, 6]
Below is the complete main class for your reference
Main class
package core.collection;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class ListFillDemo {
public static void main(String[] args) {
List<Integer> list = new ArrayList<>(0);
list.add(1);
list.add(2);
list.add(3);
list.add(4);
list.add(5);
System.out.println("Before call to fill: " + list.toString());
Collections.fill(list, 6);
System.out.println("After call to fill: " + list.toString());
}
}
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