How to convert long[] to Long[] in Java?

Approach 1: Traversing to each element and convert.

public static Long[] getBoxedArray_approach1(long[] arr) {
 if (arr == null)
  return null;

 Long[] result = new Long[arr.length];
 int index = 0;
 for (long i : arr) {
  result[index] = Long.valueOf(i);
  index++;
 }
 return result;
}

Approach 2: Using ‘Arrays.stream’.

Long[] result = Arrays.stream(arr).boxed().toArray(Long[]::new);

Approach 3: Using LongStream.

Long[] result = LongStream.of(arr).boxed().toArray(Long[]::new);

App.java

package com.sample.app;

import java.util.Arrays;
import java.util.stream.LongStream;

public class App {

 private static void printElements(Long[] arr) {
  for (long i : arr) {
   System.out.print(i + " ");
  }
  System.out.println();
 }

 public static Long[] getBoxedArray_approach1(long[] arr) {
  if (arr == null)
   return null;

  Long[] result = new Long[arr.length];
  int index = 0;
  for (long i : arr) {
   result[index] = Long.valueOf(i);
   index++;
  }
  return result;
 }

 public static Long[] getBoxedArray_approach2(long[] arr) {
  if (arr == null)
   return null;
  Long[] result = Arrays.stream(arr).boxed().toArray(Long[]::new);
  return result;
 }

 public static Long[] getBoxedArray_approach3(long[] arr) {
  if (arr == null)
   return null;
  Long[] result = LongStream.of(arr).boxed().toArray(Long[]::new);
  return result;
 }

 public static void main(String args[]) {
  long[] arr = { 1, 3, 5, 7, 2, 4, 6, 8, 10 };

  Long[] result1 = getBoxedArray_approach1(arr);
  Long[] result2 = getBoxedArray_approach2(arr);
  Long[] result3 = getBoxedArray_approach3(arr);

  printElements(result1);
  printElements(result2);
  printElements(result3);

 }

}

Output

1 3 5 7 2 4 6 8 10

1 3 5 7 2 4 6 8 10

1 3 5 7 2 4 6 8 10

You may like

Miscellaneous

Interview Questions

Programming Questions

How to convert int[] to List in Java?

How to convert byte[] to Byte[] in Java?

How to convert byte[] to List in Java?

How to convert short[] to Short[] in Java?

How to convert short[] to List in Java?