Question

How to initialize an ArrayList with zeros in Java

Answer 1

import java.util.ArrayList; 
import java.util.Arrays; 
  
public class MyClass {
    public static void main(String args[]) {
        ArrayList<Integer> al = new ArrayList<Integer>(Arrays.asList(0, 0, 0, 0, 0)); 
 
        System.out.println(al);
    }
}
  
  
  
  
/*
run:
  
[0, 0, 0, 0, 0]
  
*/

 

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Answer 2

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

public class MyClass {
    public static void main(String args[]) {
        List<Integer> list_al = new ArrayList<Integer>(Collections.nCopies(10, 0));
   
        System.out.println(list_al);
    }
}
   
   
   
/*
run:
   
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
   
*/

 

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