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Java String Exercises: Check whether the character immediately before and after a specified character is same in a given string

Java String: Exercise-80 with Solution

Write a Java program to check whether the character immediately before and after a specified character is same in a given string.

Sample Solution:

Java Code:

import java.util.*;
public class Main
{
public boolean leftAndRightSame(String stng) 
{
  int l = stng.length();
  boolean found = true;
  for (int i = 0; i < l; i++) 
  {
    String tmpString = stng.substring(i,i+1);
    if (tmpString.equals("#") && i > 0 && i < l-1) 
	{
      if (stng.charAt(i-1) == stng.charAt(i+1))
        found = true;
      else
        found = false;
    }
  }
  return found;
}
public static void main (String[] args)
    {
      Main m= new Main();
      String str1 =  "moon#night";
      System.out.println("The given string is: "+str1);
      System.out.println("The before and after character are same: "+m.leftAndRightSame(str1));
	  }
}

Sample Output:

The given string is: moon#night
The before and after character are same: true

The given string is: bat##ball
The before and after character are same: false

The given string is: #moon#night
The before and after character are same: true

Pictorial Presentation:

Java String Exercises: Check whether the character immediately before and after a specified character is same in a given string.

Flowchart:

Flowchart: Java String Exercises - Check whether the character immediately before and after a specified character is same in a given string.

Java Code Editor:

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Previous: Write a Java program to create a new string from a given string after removing the 2nd character from the substring of length three starting with 'z' and ending with 'g' presents in the said string.
Next: Write a Java program to check whether two strings of length 3 and 4 appear in same number of times in a given string.

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Java: Tips of the Day

Array vs ArrayLists:

The main difference between these two is that an Array is of fixed size so once you have created an Array you cannot change it but the ArrayList is not of fixed size. You can create instances of ArrayLists without specifying its size. So if you create such instances of an ArrayList without specifying its size Java will create an instance of an ArrayList of default size.

Once an ArrayList is full it re-sizes itself. In fact, an ArrayList is internally supported by an array. So when an ArrayList is resized it will slow down its performance a bit as the contents of the old Array must be copied to a new Array.

At the same time, it's compulsory to specify the size of an Array directly or indirectly while creating it. And also Arrays can store both primitives and objects while ArrayLists only can store objects.

Ref: https://bit.ly/3o8L2KH