BufferedReader and StringTokenizer

The StringTokenizer class in java.util can be used to parse a line of integers. Here is a Java program that reads a line of integers, displays each integer, and then calculates and displays the sum of all the integers.

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class IntegerProcessor {
    public static void main(String[] args) {
        BufferedReader reader = null;

        try {
            // Read input from the console
            reader = new BufferedReader(new InputStreamReader(System.in));
            System.out.println("Enter a line of integers separated by spaces:");
            String line = reader.readLine();

            // Use StringTokenizer to parse the line of integers
            StringTokenizer tokenizer = new StringTokenizer(line);
            int sum = 0;

            System.out.println("The integers are:");
            while (tokenizer.hasMoreTokens()) {
                String token = tokenizer.nextToken();
                int number = Integer.parseInt(token);
                System.out.println(number);
                sum += number;
            }

            // Display the sum of all integers
            System.out.println("The sum of all integers is: " + sum);

        } catch (IOException e) {
            System.err.println("An IOException occurred: " + e.getMessage());
        } finally {
            // Close the BufferedReader
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    System.err.println("Failed to close BufferedReader: " + e.getMessage());
                }
            }
        }
    }
}

Explanation:

  1. BufferedReader: Used to read a line of input from the console.
  2. StringTokenizer: Used to parse the line of integers separated by spaces.
  3. Parsing and Processing: The StringTokenizer splits the input line into tokens (integers). Each token is parsed to an integer, printed, and added to the sum.
  4. Exception Handling: Handles IOException that might occur during reading.
  5. Finally Block: Ensures that the BufferedReader is closed properly.

Detailed Steps:

  1. Reading Input:

    • The program reads a line of integers from the console using BufferedReader.

  2. Using StringTokenizer:

    • The StringTokenizer object is created with the input line.
    • The while loop iterates through each token, converts it to an integer, prints it, and adds it to the sum.

  3. Displaying Results:

    • After processing all tokens, the program prints the sum of all integers.

  4. Exception Handling:

    • The try block handles the input operations and catches any IOException.
    • The finally block ensures that the BufferedReader is closed properly to release the resources.

Programs to Try:
Find the sum of even and odd integers separately

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