What is an Array?

Element -> 1 value in an array
Index -> the position of the value in the array
Declaring an array int[] array = new int[10];
Bound errors -> accessing an element that does not exist
Uninitialized and Unfilled arrays, assigning an array variable but not the whole array
Traversing array, can use while but mainly for loop
enhanced for loop .. for (int element:values)

Important Collegeboard

array.length(), array[i]

// Write array methods for the Array Methods class below out of the options given above.
public class ArrayMethods {
    private static int[] values = {1,2,3,4,5};

    public static void swap(){
        System.out.println("0th Index = " + values[0]);
        System.out.println("4th Index = " + values[4]);
        int a = values[0];
        int b = values[4];
        values[0] = b;
        values[4] = a;
        System.out.println("0th Index = " + values[0]);
        System.out.println("4th Index = " + values[4]);
    }


    public static void replaceZero(){
        for(int i = 0; i < values.length; i++){
            if(values[i] % 2 == 0){
                values[i] = 0;
            }
        }
        for(int i : values){
            System.out.print(i);
        }
    }
}

ArrayMethods.swap();
ArrayMethods.replaceZero();

0th Index = 1
4th Index = 5
0th Index = 5
4th Index = 1
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