Write a program that passes an unspecified number of integers as command-line arguments to the main method and display the total number of integers that the user entered and their total.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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I just started learning java and having trouble with this problem. Please help figure out the coding and please add note if possible next to your codes for my understanding. 

**Task Description: Passing Command-Line Arguments in Java**

**Objective:**

Write a program that passes an unspecified number of integers as command-line arguments to the main method and displays:

- The total number of integers that the user entered
- Their total sum

**Explanation:**

In this task, learners are expected to create a Java program that takes advantage of command-line arguments to accept an unspecified number of integers from the user. The program should then calculate and display two pieces of information:

1. **The Total Number of Integers:** This involves counting how many command-line arguments were provided.
2. **The Sum of the Integers:** This involves summing up all the provided integers.

**Implementation Steps:**

1. **Main Method Setup:** Configure the `main` method to receive command-line inputs.
2. **Input Parsing:** Convert the input arguments from strings to integers.
3. **Counting the Integers:** Use a counter to determine how many integers were entered.
4. **Summing the Integers:** Sum up all the input integers.
5. **Output the Results:** Print the total count of integers and their sum to the console.

**Example Code:**

```java
public class CommandLineSum {
    public static void main(String[] args) {
        int totalCount = args.length;
        int sum = 0;

        for (String arg : args) {
            sum += Integer.parseInt(arg);
        }

        System.out.println("Total number of integers entered: " + totalCount);
        System.out.println("Sum of the integers: " + sum);
    }
}
```

**Explanation of Code:**

- `args` contains the command-line arguments.
- `totalCount` is calculated as the length of `args`.
- The program uses a for-each loop to iterate over `args`, converting each to an integer and adding it to `sum`.
- The results are printed to the console.

**Usage Example:**

To run the program, use the following command in the terminal:

```
java CommandLineSum 3 5 7 2
```

**Expected Output:**

```
Total number of integers entered: 4
Sum of the integers: 17
```

This exercise teaches students how to handle command-line arguments and perform basic operations on them in Java.
Transcribed Image Text:**Task Description: Passing Command-Line Arguments in Java** **Objective:** Write a program that passes an unspecified number of integers as command-line arguments to the main method and displays: - The total number of integers that the user entered - Their total sum **Explanation:** In this task, learners are expected to create a Java program that takes advantage of command-line arguments to accept an unspecified number of integers from the user. The program should then calculate and display two pieces of information: 1. **The Total Number of Integers:** This involves counting how many command-line arguments were provided. 2. **The Sum of the Integers:** This involves summing up all the provided integers. **Implementation Steps:** 1. **Main Method Setup:** Configure the `main` method to receive command-line inputs. 2. **Input Parsing:** Convert the input arguments from strings to integers. 3. **Counting the Integers:** Use a counter to determine how many integers were entered. 4. **Summing the Integers:** Sum up all the input integers. 5. **Output the Results:** Print the total count of integers and their sum to the console. **Example Code:** ```java public class CommandLineSum { public static void main(String[] args) { int totalCount = args.length; int sum = 0; for (String arg : args) { sum += Integer.parseInt(arg); } System.out.println("Total number of integers entered: " + totalCount); System.out.println("Sum of the integers: " + sum); } } ``` **Explanation of Code:** - `args` contains the command-line arguments. - `totalCount` is calculated as the length of `args`. - The program uses a for-each loop to iterate over `args`, converting each to an integer and adding it to `sum`. - The results are printed to the console. **Usage Example:** To run the program, use the following command in the terminal: ``` java CommandLineSum 3 5 7 2 ``` **Expected Output:** ``` Total number of integers entered: 4 Sum of the integers: 17 ``` This exercise teaches students how to handle command-line arguments and perform basic operations on them in Java.
Below is the transcription of the provided image for our Educational website, along with an explanation of its components.

---

## Introduction to Java Programming: Lab Assignment

### Lab 9: Simple Addition Program

In this lab, we will learn how to write a basic Java program that prints a message and calculates the sum of numbers. Let's analyze the structure provided in the template:

```java
package homework;

public class Lab9 {

    // Main method
    public static void main(String[] args) {
        System.out.println("You entered " + 
        /*Please write your code here*/ + " numbers");

        // Please write your code here

        System.out.println("The sum of these numbers is " + 
        /*Please write your code here*/);
    }
}
```

#### Breakdown of Components:

1. **Package Declaration**:
    ```java
    package homework;
    ```
    - The `package` statement groups related classes. Here, it indicates that the class `Lab9` is part of the `homework` package.

2. **Class Declaration**:
    ```java
    public class Lab9 {
    ```
    - This declares a public class named `Lab9`.

3. **Main Method**:
    ```java
    public static void main(String[] args) {
    ```
    - The `main` method is the entry point of any Java application. It is required to run the program.

4. **Printing the Number of Entries**:
    ```java
    System.out.println("You entered " + 
    /*Please write your code here*/ + " numbers");
    ```
    - This line prints a message indicating the number of entries. You need to insert the number of entries in place of the highlighted comment `/*Please write your code here*/`.
  
5. **Calculation and Sum Output**:
    ```java
    // Please write your code here
    ```
    - Here, you should write your own logic to handle the user input and calculate the sum of the numbers.

    ```java
    System.out.println("The sum of these numbers is " + 
    /*Please write your code here*/);
    ```
    - This line prints the calculated sum. You need to replace the highlighted comment with your code that provides the sum of the numbers.

### Instructions:

1. Fill in the first placeholder with the number of entries (e.g., from user input or predefined values).
2. Write code to calculate the
Transcribed Image Text:Below is the transcription of the provided image for our Educational website, along with an explanation of its components. --- ## Introduction to Java Programming: Lab Assignment ### Lab 9: Simple Addition Program In this lab, we will learn how to write a basic Java program that prints a message and calculates the sum of numbers. Let's analyze the structure provided in the template: ```java package homework; public class Lab9 { // Main method public static void main(String[] args) { System.out.println("You entered " + /*Please write your code here*/ + " numbers"); // Please write your code here System.out.println("The sum of these numbers is " + /*Please write your code here*/); } } ``` #### Breakdown of Components: 1. **Package Declaration**: ```java package homework; ``` - The `package` statement groups related classes. Here, it indicates that the class `Lab9` is part of the `homework` package. 2. **Class Declaration**: ```java public class Lab9 { ``` - This declares a public class named `Lab9`. 3. **Main Method**: ```java public static void main(String[] args) { ``` - The `main` method is the entry point of any Java application. It is required to run the program. 4. **Printing the Number of Entries**: ```java System.out.println("You entered " + /*Please write your code here*/ + " numbers"); ``` - This line prints a message indicating the number of entries. You need to insert the number of entries in place of the highlighted comment `/*Please write your code here*/`. 5. **Calculation and Sum Output**: ```java // Please write your code here ``` - Here, you should write your own logic to handle the user input and calculate the sum of the numbers. ```java System.out.println("The sum of these numbers is " + /*Please write your code here*/); ``` - This line prints the calculated sum. You need to replace the highlighted comment with your code that provides the sum of the numbers. ### Instructions: 1. Fill in the first placeholder with the number of entries (e.g., from user input or predefined values). 2. Write code to calculate the
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