Java: New string taking specified number of characters from first and last position of a given string

Last update on May 21 2025 12:49:05 (UTC/GMT +8 hours)

61. Substring from First and Last N Chars

Write a Java program to create a new string taking specified number of characters from first and last position of a given string.

Visual Presentation:

Sample Solution:

Java Code:

import java.util.*;

// Define a class named Main
public class Main {
    
    // Method to return a string formed by taking 'n' characters from the beginning and 'n' characters from the end
    public String nTwice(String str, int n) {
        return str.substring(0, n) + str.substring(str.length() - n, str.length());
    }

    // Main method to execute the program
    public static void main(String[] args) {
        Main m = new Main(); // Create an instance of the Main class

        String str1 = "Welcome"; // String
        int n1 = 3; // Integer 'n'
        
        // Display the given string, the given number, and the new string formed using nTwice method
        System.out.println("The given strings is: " + str1);
        System.out.println("The given numbers is: " + n1);
        System.out.println("The new string is: " + m.nTwice(str1, n1));
    }
}

Sample Output:

The given strings is: Welcome
The given numbers is: 3
The new string is: Welome

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to extract the first p characters and the last p characters of a string and concatenate them.
• Write a Java program to form a new string using the initial and terminal segments of specified length.
• Write a Java program to join substrings from the beginning and end of a string based on a user-specified number.
• Write a Java program to create a new string from the border parts of a string while handling cases of insufficient length.

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