int[] a = new int[]{1,5,44,7,32};
//how to display all elements on screen?

for (int i=0; i<a.length; i++){
  System.out.println(a[i]);
}

//ok, let's write a method that displays content of an array for index i to j inclusive
ArrayDemo.displayArray(a, 0, 2);
ArrayDemo.displayArray(a, 2, 2);
ArrayDemo.displayArray(a, 2, 4);
ArrayDemo.displayArray(a, 0, a.length - 1); //all elements
ArrayDemo.displayArray(a, 0, a.length - 1); //all elements

//now let's write a method that tries to find a value in an array
//For example example is 2 in array {1,2,34} at what index?, what abut 10?

ArrayDemo.findElement(new int[]{1,2,3,4}, 2)
ArrayDemo.findElement(new int[]{1,2,3,4}, 6)
ArrayDemo.findElement(new int[]{1,2,3,4}, 6)


int[] a = {1,2,3,4}
int[] b = {1,2,3,4}
a==b  //remember a and b are objects. they are in different memory locations!
//you need to write you own equality for array.

//let's copy content of an array to another:
a=b  //this doesn't copy contents of b into a! it copies reference of b to a!
a == b  //a and be point to the same array!

a[0] = 10
a[0]

b[0]  //as you can see array a and b are the same!

//how to copy array a into a new array? we write a method!
//it copies the array and return a new one:
ArrayDemo.copyArray(new int[]{1,2,3}, 6)
ArrayDemo.copyArray(new int[]{1,2,3}, 6)[0]
ArrayDemo.displayArray(ArrayDemo.copyArray(new int[]{1,2,3}, 6), 0, 5)

int[] a1 = ArrayDemo.copyArray(new int[]{10,2,30}, 3);
a1
ArrayDemo.displayArray(a1, 0, 2)

int[] a2 = ArrayDemo.copyArray(new int[]{10,2,30}, 10);
a2
ArrayDemo.displayArray(a2, 0, 9)