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Java String Exercises: Get a substring of a given string between two specified positions

Java String: Exercise-27 with Solution

Write a Java program to get a substring of a given string between two specified positions.

Pictorial Presentation:

Java String Exercises: Get a substring of a given string between two specified positions

Sample Solution:

Java Code:

public class Exercise27 {
    
   public static void main(String[] args)
    {
        String str = "The quick brown fox jumps over the lazy dog.";

        // Get a substring of the above string starting from
        // index 10 and ending at index 26.
        String new_str = str.substring(10, 26);

        // Display the two strings for comparison.
        System.out.println("old = " + str);
        System.out.println("new = " + new_str);
    }
}

Sample Output:

old = The quick brown fox jumps over the lazy dog.                                                            
new = brown fox jumps

Flowchart:

Flowchart: Java String Exercises - Get a substring of a given string between two specified positions

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Java Code Editor:

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Next: Write a Java program to create a character array containing the contents of a 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