Question

How to remove multiple elements from ArrayList in Java

Answer 1

import java.util.ArrayList;
import java.util.List;
import java.util.Iterator;
  
public class MyClass {
    public static void main(String args[]) {
        List<Integer> al = new ArrayList<Integer>();
        al.add(12);
        al.add(90);
        al.add(87);
        al.add(42);
        al.add(100);
        al.add(51);
        al.add(99);
        al.add(121);
 
        System.out.println(al);
 
        Iterator<Integer> itr = al.iterator();
        while (itr.hasNext()) {
            Integer number = itr.next();
 
            if (number % 2 == 0) {
                itr.remove();
            }
        }
 
        System.out.println(al);
    }
}
       
       
       
       
       
/*
run:
       
[12, 90, 87, 42, 100, 51, 99, 121]
[87, 51, 99, 121]
   
*/

 

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Answer 2

import java.util.ArrayList;
import java.util.List;

public class MyClass {
    public static void main(String args[]) {
        List<Integer> al = new ArrayList<Integer>();
        al.add(12);
        al.add(90);
        al.add(87);
        al.add(32);
        al.add(100);
        al.add(51);
        al.add(99);
        al.add(121);
 
        System.out.println(al);
 
        al.subList(1, 4).clear();

        System.out.println(al);
    }
}
       
       
       
       
       
/*
run:
       
[12, 90, 87, 32, 100, 51, 99, 121]
[12, 100, 51, 99, 121]
   
*/

 

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Answer 3

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class MyClass {
    public static void main(String args[]) {
        List<Integer> al = new ArrayList<>(Arrays.asList(0, 1, 2, 3, 4, 5, 6, 7, 8, 9));
        List<Integer> itemstoremove = new ArrayList<>(Arrays.asList(2, 3, 8));
        
        al.removeAll(itemstoremove);
        
        System.out.println(al);
     }
}
       
       
       
       
       
/*
run:
       
[0, 1, 4, 5, 6, 7, 9]
   
*/

 

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