Java: Display the middle character of a string

Last update on May 14 2025 13:03:12 (UTC/GMT +8 hours)

Find Middle Character(s) of String

Write a Java method to display the middle character of a string.

Note: a) If the length of the string is odd there will be two middle characters.
b) If the length of the string is even there will be one middle character.

Test Data:
Input a string: 350

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise3 {
  public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Input a string: ");
        String str = in.nextLine();
        System.out.print("The middle character in the string: " + middle(str)+"\n");
    }
 public static String middle(String str)
    {
        int position;
        int length;
        if (str.length() % 2 == 0)
        {
            position = str.length() / 2 - 1;
            length = 2;
        }
        else
        {
            position = str.length() / 2;
            length = 1;
        }
        return str.substring(position, position + length);
    }
}

Sample Output:

Input a string: 350                                                                                           
The middle character in the string: 5

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to extract the middle character(s) of a string and then reverse those characters.
• Write a Java program to find the middle character(s) of a string after removing all non-alphanumeric characters.
• Write a Java program to replace the middle character(s) of a string with asterisks while keeping the rest unchanged.
• Write a Java program to recursively determine the middle character(s) of a string.

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