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 obj = new ArrayList();
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');
}
}