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Java Program To Convert A Primitive Array To A List

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A quick pratical java program to convert primivie array to list. Primitive means int, float, double arrays convertion to List implementations.

1. Overview

In this programming tutorial, You will learn how to convert any primitive type array to a List. Primitive types are int, float, double, byte, long.
By end of this article, you will be able to convert int[] array to List<Integer> and float[] array to List<Float> or any primitive array to any List implementation.

Example programs are shown in classic java and using java 8 streams.

Java Program To Convert A Primitive Array To A List




2. Class Java Example


Example program to convert int[] array to ArrayList<Integer> and float[] array to LinkedList<Float>.

package com.javaprogramto.engineering.programs.conversions;

/**
 * classic java example to convert int[] array to List<Integer> and float[] array to LinkedList<Float>
 * 
 */
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

public class PrimitiveToListClassic {

    public static void main(String[] args) {

        // int array to ArrayList
        int[] intArray = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 90 };

        List<Integer> intList = new ArrayList<>();
        for (int i = 0; i < intArray.length; i++) {
            intList.add(intArray[i]);

        }
        System.out.println("intList : " + intList);

        // float array to LinkedList
        float[] floatArray = { 1.1f, 2.5f, 5.3f, 4.5f, 5, 6, 7, 8, 9, 90 };

        List<Float> floatList = new LinkedList<>();
        for (int i = 0; i < floatArray.length; i++) {
            floatList.add(floatArray[i]);

        }
        System.out.println("floatList : " + floatList);

    }

}

Output:

intList : [1, 2, 3, 4, 5, 6, 7, 8, 9, 90]
floatList : [1.1, 2.5, 5.3, 4.5, 5.0, 6.0, 7.0, 8.0, 9.0, 90.0]

3. Example Using Java 8 Streams


Java 8 Stream exmaple program to covnert int[] or double[] array to List<Integer> or List<Double>.

package com.javaprogramto.engineering.programs.conversions;

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class PrimitiveToListJava8 {

    public static void main(String[] args) {

        // int array to ArrayList
        int[] intArray = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 90 };

        List<Integer> intList = Arrays.stream(intArray).boxed().collect(Collectors.toList());

        System.out.println("intList : " + intList);

        // double array to LinkedList
        double[] doubleArray = { 1.1f, 2.5f, 5.3f, 4.5f, 5, 6, 7, 8, 9, 90 };

        List<Double> doubleList = Arrays.stream(doubleArray).boxed().collect(Collectors.toList());

        System.out.println("doubleList : " + doubleList);

    }

}


Output:

intList : [1, 2, 3, 4, 5, 6, 7, 8, 9, 90]
doubleList : [1.100000023841858, 2.5, 5.300000190734863, 4.5, 5.0, 6.0, 7.0, 8.0, 9.0, 90.0]

boxed() method does convertion to Stream<Double> and Stream<Integer>.


4. Conclusion


In this short article, We've seen how to convert int or float or double array to List<Integer> or List<Double> or List<Float>.

Note: Arrays.asList() is not directly used to convert to List becuase it expects to return List<int[]>.

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JavaProgramTo.com: Java Program To Convert A Primitive Array To A List
Java Program To Convert A Primitive Array To A List
A quick pratical java program to convert primivie array to list. Primitive means int, float, double arrays convertion to List implementations.
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