How can two arrays be merged into one array in Java?

2 years ago
Noah Thompson
1 minute

In Java, you can merge two arrays into one using either the System.arraycopy() method or the Arrays.copyOf() method. Below are examples of both methods.

  1. Use the System.arraycopy() method:
int[] array1 = {1, 2, 3};
int[] array2 = {4, 5, 6};

int[] mergedArray = new int[array1.length + array2.length];
System.arraycopy(array1, 0, mergedArray, 0, array1.length);
System.arraycopy(array2, 0, mergedArray, array1.length, array2.length);

System.out.println(Arrays.toString(mergedArray));
  1. Utilize the Arrays.copyOf() method:
int[] array1 = {1, 2, 3};
int[] array2 = {4, 5, 6};

int[] mergedArray = Arrays.copyOf(array1, array1.length + array2.length);
System.arraycopy(array2, 0, mergedArray, array1.length, array2.length);

System.out.println(Arrays.toString(mergedArray));

Both methods involve copying the second array to the end of the first array, achieving the merging of the two arrays.

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