Arraylist replaceAll() Code With Examples

Program

import java.util.ArrayList;
import java.util.Collections;
public class ArrayListReplaceAll 
{
	public static void main(String[] args) 
	{
		ArrayList<String> colorList = new ArrayList<String>();
		colorList.add("White");
		colorList.add("White");
		colorList.add("Black");
		colorList.add("Grey");
		colorList.add("Blue");
		colorList.add("White");
		colorList.add("Green");
		colorList.add("Black");
		colorList.add("White");
		System.out.println("Original List:" + colorList);
		Collections.replaceAll(colorList, "White", "Black");
		System.out.println(" After replacing all White color with Balack color :"+ colorList);
	}
}

Output

 Original List[White, White, Black, Grey, Blue, White, Green, Black, White]
 After replacing all White color with Black color :[Black, Black, Black, Grey, Blue,Black, Green, Black, Black]
 

Description

public void replaceAll(UnaryOperator operator)

List Replaces each element of this list with the result of applying the operator to that element.