Array Declaration

 1)declaration

   Memory allocation

public class declaration1 {

    public static void main(String[] args) {

        // DECLARATION

        int[] marks;

        // MEMORY ALLOCATION

        marks = new int[5];

        marks[0] = 37;

        marks[1] = 23;

        marks[2] = 44;

        marks[3] = 63;

        marks[4] = 43;

        System.out.println(marks[4]);

    }

}

2)Declaration +Memory Allocation 

public class d2 {

    public static void main(String[] args) {

        int[] marks = new int[5];  //DECLARATION + MEMORY ALLOCATION

        marks[0] = 37;

        marks[1] = 23;

        marks[2] = 44;

        marks[3] = 63;

        marks[4] = 43;

        System.out.println(marks[4]);

    }

}

3)Declaration + Initialization

public class d3 {

    public static void main(String[] args) {

        // Declaration+ Initialization

        int[] marks = { 100, 78, 45, 33, 77 };

        System.out.println(marks[4]);

    }

}