Write a Java method to display the middle character of a string
This Java program prompts the user to enter a string and then finds and prints the middle character(s) of the string. Here's a step-by-step explanation of how the program works:
- The program begins by importing the Scanner class, which is used to read user input from the command line.
- The main method is defined, which is the entry point of the program.
- A new Scanner object is created and assigned to the variable input.
- The program prompts the user to enter a string by calling System.out.print() method with the message "Enter the String: ".
- The user enters a string, which is read by calling the nextLine() method on the Scanner object input, and is assigned to the variable str.
- Two integer variables pos and len are declared but not initialized.
- The program checks if the length of the input string is even by using the modulo operator (%) to determine if the remainder of str.length() / 2 is zero. If the length is even, the middle characters will be the two characters at positions str.length() / 2 - 1 and str.length() / 2. If the length is odd, the middle character will be the single character at position str.length() / 2.
- The program assigns the value of pos and len based on whether the length of the input string is even or odd, as described in step 7.
- The program uses the substring() method on the string str to extract the middle character(s) by passing in the pos and len variables as arguments. This method returns a new string that contains the characters of the original string starting at position pos and continuing for len characters.
- The program prints the middle character(s) of the input string by calling System.out.print() method with the message "Middle character in the String : " concatenated with the result of the substring() method.
- The program terminates.
Overall, this program is a simple example of how to manipulate strings in Java to find the middle character(s) of a string.
Source Code
import java.util.Scanner;
public class Middle_Character
{
public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
System.out.print("Enter the String: ");
String str = input.nextLine();
int pos;
int len;
if (str.length() % 2 == 0)
{
pos = str.length() / 2 - 1;
len = 2;
}
else
{
pos = str.length() / 2;
len = 1;
}
System.out.print("Middle character in the String : " + str.substring(pos, pos + len));
}
}
Output
Enter the String: Computer
Middle character in the String : pu