Question

How to initialize a list in Java

Answer 1

import java.util.List;
import java.util.ArrayList;
 
public class MyClass {
    public static void main(String args[]) {
        List<Integer> list = new ArrayList<Integer>();
         
        list.add(7);
        list.add(2);
        list.add(9);
        list.add(5);        
        list.add(4);
         
        System.out.println(list.toString());
    }
}
 
 
 
 
/*
run:
  
[7, 2, 9, 5, 4]
  
*/

 

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Answer 2

import java.util.List;
import java.util.ArrayList;
 
public class MyClass {
    public static void main(String args[]) {
        List<Integer> list = new ArrayList<Integer>() {{
            add(7);
            add(2);
            add(9);
            add(5);
            add(4);
            }};
         
        System.out.println(list.toString());
    }
}
 
 
 
 
/*
run:
  
[7, 2, 9, 5, 4]
  
*/

 

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Answer 3

import java.util.List;
import java.util.Arrays;
 
public class MyClass {
    public static void main(String args[]) {
        List<Integer> list = Arrays.asList(7, 2, 9, 5, 4);

        System.out.println(list.toString());
    }
}
 
 
 
 
/*
run:
  
[7, 2, 9, 5, 4]
  
*/

 

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Answer 4

import java.util.List;
import java.util.ArrayList;
import java.util.Arrays;
 
public class MyClass {
    public static void main(String args[]) {
        List<Integer> list = new ArrayList<>(Arrays.asList(7, 2, 9, 5, 4)); 

        System.out.println(list.toString());
    }
}
 
 
 
 
/*
run:
  
[7, 2, 9, 5, 4]
  
*/

 

70+ SQL courses for beginners and professionals