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excHandling.java

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package excHandling;

import java.util.*;

import java.io.*;

public class ArrayListProg {

public static void main(String[] args) throws IOException {

System.out.println("Program for implementing ArrayList: ");

ArrayList<Character> obj = new ArrayList<Character>();

Scanner sc = new Scanner(System.in);

char ans;

do {

System.out.println("Main Menu");

System.out.println("1. Create \n2. Display \n3. Insert \n4. Delete \n5. Modify");

System.out.println("Enter your choice: ");

int choice = sc.nextInt();

switch (choice) {

case 1:

System.out.println("Inserting some elements in the array...");

System.out.println("How many characters do you want to add to the list? ");

int n = sc.nextInt();

for (int i = 0; i < n; i++) {

System.out.println("Enter character: ");

char ch = sc.next().charAt(0);

if (Character.isDigit(ch))

throw new IOException("Invalid data type!");

else

obj.add(ch);

}

break;

case 2:

System.out.println("The size of the array is: " + obj.size());

System.out.println("The array elements are: " + obj);

break;

case 3:

System.out.println("Inserting some elements in the array in between: ");

System.out.println("Enter the index at which you want to insert new character: ");

int i = sc.nextInt();

System.out.println("Enter character: ");

char ch = sc.next().charAt(0);

if (Character.isDigit(ch))

throw new IOException("Invalid data type!");

else

obj.add(i, ch);

break;

case 4:

System.out.println("Enter the index of the number that you want to delete: ");

int index = sc.nextInt();

System.out.println("Removing " + index + "th element from the array!");

obj.remove(index);

break;

case 5:

System.out.println("Updating the elements from the array: ");

System.out.println("Enter the index at which you want to modify the character: ");

i = sc.nextInt();

System.out.println("Enter character: ");

ch = sc.next().charAt(0);

if (Character.isDigit(ch))

throw new IOException("Invalid data type!");

else

obj.set(i, ch);

break;

}

System.out.println("Do you want to go back to main menu?(y/n)");

ans = sc.next().charAt(0);

} while (ans == 'y' || ans == 'Y');

}