Write a Java Program to Concatenate Two Arrays

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Write a Java Program to Concatenate Two Arrays

PROGRAM: Java Program to Concatenate Two Arrays

/*Java Program to Concatenate Two Arrays*/

1: Concatenate Two Arrays using arraycopy

import java.util.Arrays;

public class Concat {

    public static void main(String[] args) {
        int[] array1 = {1, 2, 3};
        int[] array2 = {4, 5, 6};

        int aLen = array1.length;
        int bLen = array2.length;
        int[] result = new int[aLen + bLen];

        System.arraycopy(array1, 0, result, 0, aLen);
        System.arraycopy(array2, 0, result, aLen, bLen);

        System.out.println(Arrays.toString(result));
    }
}

2: Concatenate Two Arrays without using arraycopy

import java.util.Arrays;

public class Concat {

    public static void main(String[] args) {
        int[] array1 = {1, 2, 3};
        int[] array2 = {4, 5, 6};

        int length = array1.length + array2.length;

        int[] result = new int[length];
        int pos = 0;
        for (int element : array1) {
            result[pos] = element;
            pos++;
        }

        for (int element : array2) {
            result[pos] = element;
            pos++;
        }

        System.out.println(Arrays.toString(result));
    }
}