Question

Write a program that prompts the user for a String value and a character value. The program should then find the last occurrence of the provided character in the provided String and display the corresponding index. If the character is not found in the String, display -1. For additional challenge, create a multi-class solution. The business class should consist of two instance varaibles to store the user provided values and one method to accomplish the given task. The tester class should call the instance method to test the behavior.

Answer 1

import java.util.Scanner; //reads data from input stream
class CharacterChecker
{
//instance variables
String original;
char data;
//parameterized constructor
CharacterChecker(String original,char data)
{
this.original=original;
this.data=data;
}
int findLastOccurence()
{
int found=-1;
for(int i=original.length()-1;i>=0;i--)
{
if(original.charAt(i)==data)
{
found=i;
break;
}
}
return found;
}   
}
class Tester
{
public static void main(String[] args)
{
Scanner input=new Scanner(System.in);
System.out.println("Enter String:");
String original=input.nextLine();
System.out.print("Enter character to search in string: ");
char data=input.next().charAt(0);
CharacterChecker checker=new CharacterChecker(original,data);
int found=checker.findLastOccurence();
if(found!=-1)
System.out.println("The given "+data+" is found at "+found+" in "+original);
else
System.out.println("The given "+data+" is not found in "+original);
}
}   

Output

koushikhp@koushikhpnew:~$ java Tester
Enter String:
Welcome
Enter character to search in string: e
The given e is found at 6 in Welcome
koushikhp@koushikhpnew:~$ java Tester
Enter String:
Hai welcome to Computers
Enter character to search in string: o
The given o is found at 16 in Hai welcome to Computers
koushikhp@koushikhpnew:~$ java Tester
Enter String:
Hai welcome
Enter character to search in string: a
The given a is found at 1 in Hai welcome

koushikhp@koushikhpnew:~$ java Tester
Enter String:
HAI WELCOME
Enter character to search in string: B
The given B is not found in HAI WELCOME