Could anyone help me with ArrayReverser, LeapYear , ExceptionZero . so that I could understand it better thanks advance.

Reverser.java

public class Reverser extends Presenter{ // method to reverse an array and displaying it public static int[] reverse(int a[]) { int[] b = new int[n]; int j = n; for (int i = 0;...) { // complete for loop definition // do some coding } return b; } // info has to return a content for an array {1, 2, 3{ like // <1, 2, 3> public static void main(String[] args) { int [] arr = {10, 20, 30, 40, 50}; Rerverser r = new Reverser(arr); r.reverse(); } }

LeapYear.java

import java.util.Scanner;

// Leap year occurs in a year which is an integer multiple of 4 (except for years evenly divisible by 100, // which are not leap years unless evenly divisible by 400)

// The following code is not working for all leap years. Modify LeapChecker() to fix it.

public class LeapYear { public static String LeapChecker(int year) { boolean isLeap = false; if(year % 4 == 0) { if(year % 100 == 0) { // some coding is required isLeap = false; } else isLeap = true; } else { isLeap = false; } if(isLeap == true) return(year + " is a Leap Year."); else return(year + " is not a Leap Year."); } public static void main(String[] args) { int year; Scanner scan = new Scanner(System.in); System.out.println("Enter any Year:"); year = scan.nextInt(); scan.close(); System.out.println(LeapChecker(year)); } }

ExceptionZero.java

class ExceptionZero { public static String divideMethod(int a, int b) { // Modify this method to catch appropriate exception and return exception e.toString()

int result = a/b; // don't modify the return statement return String.valueOf(result); } public static void main(String[] args) { System.out.println(divideMethod(20, 0)); } }

...................................

Presenter.java

public abstract class Presenter {

public abstract String info();

}

SReverser.java

import java.util.Arrays;

// reverse only the part of the array indicated by index (from, to)

// example

// {1, 2, 3}

// reverse(2,3) would give

// {1, 3, 2}

// throw an excpetion, if bound are negative, or if to > from

public class SReverser extends Reverser{

public SReverser(int[] a) throws EmptyArrayException {

// need some code

}

public int[] reverse(int from, int upTo) throws InvalidBoundsException{

// need some code

}

}

EmptyArrayException.java

public class EmptyArrayException extends Exception {

private static final long serialVersionUID = 42L;

public class EmptyArrayException extends Exception {

public EmptyArrayException() {

System.out.println("Array reference is null");

}

}

InvalidBoundsException.java

public class InvalidBoundsException extends Exception {

private static final long serialVersionUID = 43L;

public InvalidBoundsException() {

System.out.println("Invalid Bounds exception");

}

}