Converting Between array and List in Java

You can convert arrays to Lists and Lists to arrays.

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package arraytolist;

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

public class ArrayToListAndBack {

    public static void main(String[] args) {
        String[] names = { "Karl", "Peter", "Lucas" };
        // Array to list
        List<String> listNames = Arrays.asList(names);

        // List to array
        String[] newArrayNames = listNames.toArray(new String[0]);

        for (String t : newArrayNames) {
            System.out.println(t);
        }
    }
}

package arraytolist;

import java.util.Arrays;

import java.util.List;

public class ArrayToListAndBack {

public static void main(String[] args) {

String[] names = { "Karl", "Peter", "Lucas" };

// Array to list

List<String> listNames = Arrays.asList(names);

// List to array

String[] newArrayNames = listNames.toArray(new String[0]);

for (String t : newArrayNames) {

System.out.println(t);

}

Line 11 specifies the type of the array. The advantage of specifying a size of 0 for the parameter is that Java will create a new array of the proper size for the return value. You can suggest a larger array to be used instead. If the ArrayList fits in the array, it will be returned. Otherwise, a new one will be created.

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