how to declare array java

1int intArray[];    //declaring array
2intArray = new int[20];  // allocating memory to array
3//OR
4int[] intArray = new int[20]; // combining both statements in one

1int[] array = new int[/*size*/];
2// Works for double, char, etc.

1int[] array1 = new int[5]; //int array length 5
2String[] array2 = new String[5] //String array length 5
3double[] array3 = new double[5] // Double array length 5
4

1int[] intArray = new int[]{ 1,2,3,4,5,6,7,8,9,10 }

1// Accessing array elements using for loop
2public class AccessingArrayElements
3{
4   public static void main(String[] args)
5   {
6      int[] arrNum = {25, 23, 15, 20, 24};
7      for(int a = 0; a < arrNum.length; a++)
8      {
9         System.out.println(arrNum[a]);
10      }
11   }
12}

1int[] intArray = new int[20];
2String[] cars = {"Volvo", "BMW", "Ford", "Mazda"};