Java ArrayList replaceAll()

Java ArrayList [Java ArrayList] Java ArrayList

replaceAll()

replaceAll() 

arraylist.replaceAll(UnaryOperator<E> operator)

arraylist ArrayList

  • operator -

replaceAll()

import java.util.*;

class Main {
    public static void main(String[] args){

        //
        ArrayList<String> sites = new ArrayList<>();
       
        sites.add("Google");
        sites.add("Runoob");
        sites.add("Taobao");

        System.out.println("ArrayList : " + sites);

        //
        sites.replaceAll(e -> e.toUpperCase());
        System.out.println(" ArrayList: " + sites);
    }
}

ArrayList : [Google, Runoob, Taobao]
 ArrayList: [GOOGLE, RUNOOB, TAOBAO]

2

import java.util.ArrayList;

class Main {
    public static void main(String[] args) {
        //
        ArrayList<Integer> numbers = new ArrayList<>();

        //
        numbers.add(1);
        numbers.add(2);
        numbers.add(3);
        System.out.println("ArrayList: " + numbers);
        // 2
        numbers.replaceAll(e -> e * 2);;
        System.out.println(" ArrayList: " + numbers);
    }
}

ArrayList: [1, 2, 3]
 ArrayList: [2, 4, 6]

numbers 

numbers.replaceAll(e -> e * 2);
  • e -> e * 2 - 2
  • replaceAll() - e -> e * 2

Java ArrayList [Java ArrayList] Java ArrayList