In Java, we can concatenate two arrays of the same data type using the Arrays.copyOf() or System.arraycopy() method.
Here is an example using Arrays.copyOf():
int[] array1 = {1, 2, 3};
int[] array2 = {4, 5, 6};
int[] result = Arrays.copyOf(array1, array1.length + array2.length);
System.arraycopy(array2, 0, result, array1.length, array2.length);
System.out.println(Arrays.toString(result)); // Output: [1, 2, 3, 4, 5, 6]
Here is another example using System.arraycopy():
int[] array1 = {1, 2, 3};
int[] array2 = {4, 5, 6};
int[] result = new int[array1.length + array2.length];
System.arraycopy(array1, 0, result, 0, array1.length);
System.arraycopy(array2, 0, result, array1.length, array2.length);
System.out.println(Arrays.toString(result)); // Output: [1, 2, 3, 4, 5, 6]
In both examples, we create two arrays array1 and array2, and then concatenate them into a new array called result. We can then print out the contents of result using Arrays.toString() method.
The first example uses Arrays.copyOf() to create result array of size array1.length + array2.length, copies the contents of array1 to result, and then copies the contents of array2 to result starting from index array1.length.
The second example creates result array of size array1.length + array2.length, copies the contents of array1 to result starting from index 0, and then copies the contents of array2 to result starting from index array1.length.