Question

How to Initialize ArrayList in Java

Answer 1

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

public class MyClass {
    public static void main(String args[]) {
       ArrayList<String> al = new ArrayList<String>(Arrays.asList("java", "php", "c#"));
 
       System.out.println(al);
    }
}


 
/*
run:
 
[java, php, c#]
 
*/

 

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Answer 2

import java.util.ArrayList;

public class MyClass {
    public static void main(String args[]) {
        ArrayList<String> al = new ArrayList<String>();
         
        al.add("java");
        al.add("php");
        al.add("python");
 
       System.out.println(al);
    }
}
 
 
/*
run:
 
[java, php, python]
 
*/

 

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Answer 3

import java.util.ArrayList;

public class MyClass {
    public static void main(String args[]) {
        ArrayList<String> al = new ArrayList<String>() {{
            add("java");
            add("php");
            add("python");
            add("c++");
        }};
 
       System.out.println(al);
    }
}

 
/*
run:
 
[java, php, python, c++]
 
*/
 

 

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Answer 4

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(5, 2, 9, 7, 5, 1)); 
  
        System.out.println(al);
    }
}
   
   
   
   
/*
run:
   
[5, 2, 9, 7, 5, 1]
   
*/

 

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