Question

How to combine (concatenate) two arrays in Java

Answer 1

import java.util.Arrays;
 
public class Main {
    public static void main(String args[]) {
        int[] array1 = {1, 2, 3, 3};
        int[] array2 = {4, 5, 6, 7, 8};
 
        int len1 = array1.length;
        int len2 = array2.length;
         
        int[] combine = new int[len1 + len2];
 
        System.arraycopy(array1, 0, combine, 0, len1);
        System.arraycopy(array2, 0, combine, len1, len2);
 
        System.out.println(Arrays.toString(combine));
    }
}
   
   
   
/*
run:
   
[1, 2, 3, 3, 4, 5, 6, 7, 8]
  
*/

 

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Answer 2

import java.util.Arrays;
  
public class Main {
    public static void main(String args[]) {
        int[] array1 = {1, 2, 3, 3};
        int[] array2 = {4, 5, 6, 7, 8};
 
        int[] combine = Arrays.copyOf(array1, array1.length + array2.length);
         
        for (int i = 0; i < array2.length; i++) {
            combine[array1.length + i] = array2[i];
        }
          
        System.out.println(Arrays.toString(combine));
    }
}

   
   
/*
run:
   
[1, 2, 3, 3, 4, 5, 6, 7, 8]
  
*/

 

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