Answered: ew HMap<

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

Problem 1PE

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Question

package ch08.apps;
import ch08.maps.*;

public class HMapDriver
{
public static void main(String[] args)
{
boolean result;
HMap<String, String> test;
test = new HMap<String, String>(10,0.75);

/*
String s = null;
test.put(s,"value");
test.put("s",null);
System.out.println("Expect 'null':\t" + test.get("s"));
System.out.println("Expect 'true':\t" + test.contains("s"));
test = new ArrayListMap<String, String>();
*/

System.out.println("Expect 'true':\t" + test.isEmpty());
System.out.println("Expect '0':\t" + test.size());

System.out.println("Expect 'null':\t" + test.put("1", "One"));
System.out.println("Expect 'false':\t" + test.isEmpty());
System.out.println("Expect '1':\t" + test.size());

System.out.println("Expect 'One':\t" + test.put("1", "One"));
System.out.println("Expect 'false':\t" + test.isEmpty());
System.out.println("Expect '1':\t" + test.size());

test.put("2", "Two");
test.put("3", "Three");
test.put("4", "Four");
test.put("5", "Five");
System.out.println("Expect '5':\t" + test.size());

System.out.println("Expect 'Three':\t" + test.put("3", "Three XXX"));
System.out.println("Expect 'Three XXX':\t" + test.put("3", "Three"));
System.out.println("Expect '5':\t" + test.size());

System.out.println("Expect 'true':\t" + test.contains("5"));
System.out.println("Expect 'false':\t" + test.contains("6"));

System.out.println(test);

test.put("d","d");

System.out.println(test);
System.out.println("Expect 'true':\t" + test.contains("d"));
System.out.println("Expect 'false':\t" + test.contains("e"));

System.out.println("Expect 'One':\t" + test.get("1"));
System.out.println("Expect 'One':\t" + test.get("1"));
System.out.println("Expect 'Two':\t" + test.get("2"));
System.out.println("Expect 'Three':\t" + test.get("3"));
System.out.println("Expect 'Four':\t" + test.get("4"));
System.out.println("Expect 'Five':\t" + test.get("5"));
System.out.println("Expect 'null':\t" + test.get("6"));

test.put("e","e");

System.out.println(test);

System.out.println("\nThe Map is:\n");
for (MapEntry<String,String> m: test)
System.out.println(m + "\n");

System.out.println(1);
test.put("f","f");
System.out.println(2);
System.out.println(test);
System.out.println(3);
System.out.println("\nThe Map is:\n");
for (MapEntry<String,String> m: test)
System.out.println(m + "\n");
System.out.println(4);

}
}

**Exercise 3: Detecting Repeated Words using HMap**

**Objective:**

Create an application that utilizes the `HMap` from Chapter 8 sample codes (located in the `bookFiles` folder). This application will read a list of words from a provided file and determine whether any word repeats.

**Instructions:**

1. **Implement the Application:**
- Use the `HMap` data structure to track the words as they are read from the file.

2. **Input Handling:**
- Read the list of words from the provided file.

3. **Output Requirements:**
- The application should check for repeated words.
- As soon as the application identifies at least one word that repeats, it should display the message:
```
<such and such word> repeats
```
and then terminate the execution.
- If all words in the list are unique and no repetition is found, the application should display:
```
No words repeat
```
and terminate.

By following these steps, you will ensure that the application efficiently reads an input file and promptly identifies any repeated words. If no repeats are found, the application will appropriately indicate this outcome.

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