w3resource

Java String Exercises: Return a string with the characters of the index position 0,1,2, 5,6,7, ... from a given string

Java String: Exercise-97 with Solution

Write a Java program to return a string with the characters of the index position 0,1,2, 5,6,7, ... from a given string.

Sample Solution:

Java Code:

import java.util.*;
public class Main
{
public String pairsToReturn(String stng) 
{
  String fin_str = "";
  for (int i=0; i<stng.length(); i += 5) 
  {
    int end = i + 3;
    if (end > stng.length()) 
	{
      end = stng.length();
    }
    fin_str = fin_str + stng.substring(i, end);
  }
  return fin_str;
}

public static void main (String[] args)
    {
      Main m= new Main();
      String str1 =  "w3resource.com";
      System.out.println("The given string is: "+str1);
      System.out.println("The new string is: "+m.pairsToReturn(str1));
	  }
}

Sample Output:

The given string is: w3resource.com
The new string is: w3rour.co

Pictorial Presentation:

Java String Exercises: Return a string with the characters of the index position 0,1,2, 5,6,7, ... from a given string

Flowchart:

Flowchart: Java String Exercises - Return a string with the characters of the index position 0,1,2,  5,6,7, ... from a given string

Java Code Editor:

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Next: Write a Java program to check whether the first instance of a given character is immediately followed by the same character 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