In netbeans using Java create a class Palindrome2 which replaces the while loop of problem 13 with a for loop.

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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In netbeans using Java create a class Palindrome2 which replaces the while loop of problem 13 with a for loop.

```java
package lab9;
import java.util.Scanner;
public class Palindrome1
{
    public static void main(String[] args)
    {
        // Create a Scanner
        Scanner input = new Scanner(System.in);

        // Prompt the user to enter a string
        System.out.print("Enter a string: ");
        String s = input.nextLine();

        // The index of the first character in the string
        int low = 0;

        // The index of the last character in the string
        int high = s.length() - 1;

        boolean isPalindrome = true;
        while (low < high)
        {
            if (s.charAt(low) != s.charAt(high))
            {
                isPalindrome = false;
                break;
            }
            low++;
            high--;
        }

        if (isPalindrome)
        {
            System.out.println(s + " is a palindrome");
        }
        else
        {
            System.out.println(s + " is not a palindrome");
        }
    }
}
```

### Explanation

The provided Java program checks if the input string is a palindrome. A palindrome is a sequence of characters that reads the same backward as forward.

1. **Imports**: The program utilizes `java.util.Scanner` to obtain user input.

2. **Class and Method Definition**:
   - The `Palindrome1` class contains the `main` method where the execution begins.
   
3. **Scanner for Input**:
   - A `Scanner` object named `input` is created to capture user input from the console.

4. **User Prompt**:
   - The user is prompted to enter a string.

5. **Index Initialization**:
   - `low` is initialized to 0, representing the first character in the string.
   - `high` is initialized to `s.length() - 1`, representing the last character in the string.

6. **Palindrome Check**:
   - A `boolean` variable `isPalindrome` is set to `true` initially.
   - A `while` loop iterates as long as `low < high`.
   - Inside the loop, characters at positions `low` and `high` are compared.
   - If they differ, `isPalindrome` is set to `false` and the loop is terminated.
   - If they are the same, `low` is incremented, and `high` is decremented to further check inward pairs.

7
Transcribed Image Text:```java package lab9; import java.util.Scanner; public class Palindrome1 { public static void main(String[] args) { // Create a Scanner Scanner input = new Scanner(System.in); // Prompt the user to enter a string System.out.print("Enter a string: "); String s = input.nextLine(); // The index of the first character in the string int low = 0; // The index of the last character in the string int high = s.length() - 1; boolean isPalindrome = true; while (low < high) { if (s.charAt(low) != s.charAt(high)) { isPalindrome = false; break; } low++; high--; } if (isPalindrome) { System.out.println(s + " is a palindrome"); } else { System.out.println(s + " is not a palindrome"); } } } ``` ### Explanation The provided Java program checks if the input string is a palindrome. A palindrome is a sequence of characters that reads the same backward as forward. 1. **Imports**: The program utilizes `java.util.Scanner` to obtain user input. 2. **Class and Method Definition**: - The `Palindrome1` class contains the `main` method where the execution begins. 3. **Scanner for Input**: - A `Scanner` object named `input` is created to capture user input from the console. 4. **User Prompt**: - The user is prompted to enter a string. 5. **Index Initialization**: - `low` is initialized to 0, representing the first character in the string. - `high` is initialized to `s.length() - 1`, representing the last character in the string. 6. **Palindrome Check**: - A `boolean` variable `isPalindrome` is set to `true` initially. - A `while` loop iterates as long as `low < high`. - Inside the loop, characters at positions `low` and `high` are compared. - If they differ, `isPalindrome` is set to `false` and the loop is terminated. - If they are the same, `low` is incremented, and `high` is decremented to further check inward pairs. 7
Expert Solution
Step 1

For Loop

Programmers use the for loop, a conditional iterative statement, to check for specific criteria and then continually run a piece of code as long as those requirements are satisfied.

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Follow-up Question

In netbeans using Java create a class Palindrome2 The class uses a for loop to determine whether a word (string) entered by the user is a palindrome. 

```java
package lab9;
import java.util.Scanner;
public class Palindrome1
{
    public static void main(String[] args)
    {
        // Create a Scanner
        Scanner input = new Scanner(System.in);

        // Prompt the user to enter a string
        System.out.print("Enter a string: ");
        String s = input.nextLine();

        // The index of the first character in the string
        int low = 0;

        // The index of the last character in the string
        int high = s.length() - 1;

        boolean isPalindrome = true;
        while (low < high)
        {
            if (s.charAt(low) != s.charAt(high))
            {
                isPalindrome = false;
                break;
            }

            low++;
            high--;
        }

        if (isPalindrome)
        {
            System.out.println(s + " is a palindrome");
        }
        else
        {
            System.out.println(s + " is not a palindrome");
        }
    }
}
```

### Explanation:

This Java program checks if a given string is a palindrome. A palindrome is a word, phrase, or sequence that reads the same forward and backward (ignoring spaces, punctuation, and capitalization). Here’s a detailed explanation of the code:

1. **Package Declaration:**
   - `package lab9;` - The code is part of the `lab9` package.

2. **Import Statement:**
   - `import java.util.Scanner;` - This imports the `Scanner` class, which is used to obtain user input.

3. **Class Declaration:**
   - `public class Palindrome1` - The main class named `Palindrome1`.

4. **Main Method:**
   - `public static void main(String[] args)` - The entry point of the program.

5. **Scanner Creation:**
   - `Scanner input = new Scanner(System.in);` - Creates a `Scanner` object to get input from the user.

6. **User Prompt and Input:**
   - `System.out.print("Enter a string: ");` - Prompts the user to enter a string.
   - `String s = input.nextLine();` - Reads the entire line of input from the user and stores it in the string `s`.

7. **Index Initialization:**
   - `int low = 0;` - Initializes the index for the first character of the string.
   -
Transcribed Image Text:```java package lab9; import java.util.Scanner; public class Palindrome1 { public static void main(String[] args) { // Create a Scanner Scanner input = new Scanner(System.in); // Prompt the user to enter a string System.out.print("Enter a string: "); String s = input.nextLine(); // The index of the first character in the string int low = 0; // The index of the last character in the string int high = s.length() - 1; boolean isPalindrome = true; while (low < high) { if (s.charAt(low) != s.charAt(high)) { isPalindrome = false; break; } low++; high--; } if (isPalindrome) { System.out.println(s + " is a palindrome"); } else { System.out.println(s + " is not a palindrome"); } } } ``` ### Explanation: This Java program checks if a given string is a palindrome. A palindrome is a word, phrase, or sequence that reads the same forward and backward (ignoring spaces, punctuation, and capitalization). Here’s a detailed explanation of the code: 1. **Package Declaration:** - `package lab9;` - The code is part of the `lab9` package. 2. **Import Statement:** - `import java.util.Scanner;` - This imports the `Scanner` class, which is used to obtain user input. 3. **Class Declaration:** - `public class Palindrome1` - The main class named `Palindrome1`. 4. **Main Method:** - `public static void main(String[] args)` - The entry point of the program. 5. **Scanner Creation:** - `Scanner input = new Scanner(System.in);` - Creates a `Scanner` object to get input from the user. 6. **User Prompt and Input:** - `System.out.print("Enter a string: ");` - Prompts the user to enter a string. - `String s = input.nextLine();` - Reads the entire line of input from the user and stores it in the string `s`. 7. **Index Initialization:** - `int low = 0;` - Initializes the index for the first character of the string. -
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