Java String Exercises: Return the substring that is between the first and last appearance of the substring 'toast' in the given string, or return the empty string if substirng 'toast' does not exists

Java String: Exercise-69 with Solution

Write a Java program to return the substring that is between the first and last appearance of the substring 'toast' in the given string,or return the empty string if substirng 'toast' does not exists.

Sample Solution:

Java Code:

import java.util.*;
public class Main
{
public String pickMiddleOfBread(String stng) 
{
  int len = stng.length();
  String tmpString = "";
  String resultString = "";
  int st = 0;
  int en = 0;
  boolean found = false;
  if (len <= 10)
    return "";
  for (int i = 0; i < len - 4; i++) 
  {
    tmpString = stng.substring(i, i+5);
    if (tmpString.equals("toast") && found == true)
      en = i; 
    if (tmpString.equals("toast") && found == false) 
	{
      st = i+5;
      found = true;
    }
  }
  resultString = stng.substring(st,en);
  return resultString;
}
public static void main (String[] args)
    {
      Main m= new Main();
      String str1 =  "sweettoastbuttertoast";
      System.out.println("The given strings is: "+str1);
      System.out.println("The new string is: "+m.pickMiddleOfBread(str1));
	  }
}

Sample Output:

The given strings is: sweettoastbuttertoast
The new string is: butter

Pictorial Presentation:

Flowchart:

Java Code Editor:

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