The below code shows the different ways one can declare and initialize an Array in Java:
import java.util.Arrays;
public class ArraysDemo {
public static void main(String[] args) {
int[] a1 = new int[]{1,2,3,4};
print(a1); //[1,2,3,4]
int[] a2 = new int[4];
a2[0] = 1;a2[2]=10;
print(a2); //[1,0,10,0]
int[] a3 = {1,4,5,67,8};
print(a3); //[1,4,5,67,8]
print(getArray()); //[3,32,6,7,5]
}
public static int[] getArray(){
//return {1,2,3,4}; - Invalid
return new int[]{3,32,6,7,5};
}
public static void print(int[] a){
System.out.println(Arrays.toString(a));
}
}
- Line 5: Declaration of array along with initialization of its values. Here it is not required to pass the size of the array.
- Line 8-9: Declaration of array by providing its size. The array will be initialized with 0 and we can then assign the value using the index.
- Line 12: Declaration with initialization
- Line 20: One of permissible way to return an array from the method
