Objective: It is always a good idea to organize your fears in a data structure.
ID: 3691697 • Letter: O
Question
Objective:
It is always a good idea to organize your fears in a data structure. Create a hash table of phobias where each entry the key is the name of the phobia, and the data is the explanation.
Create a class Phobia
Create a hash table PhobiaHashTable where each of the buckets corresponds to letters in the English alphabet.
Create a front end where users can add, remove, look up, and print out their fears.
Example Dialog:
Welcome to the fear hash table!
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
1
What is the fear’s name
Ancraophobia
Describe the fear
Fear of wind
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
1
What is the fear’s name
Cyberphobia
Describe the fear
Fear of computers or working on a computer
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
1
What is the fear’s name
Kakorrhaphiophobia
Describe the fear
Fear of failure or defeat
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
1
What is the fear’s name
Lutraphobia
Describe the fear
Fear of otters
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
1
What is the fear’s name
Arachibutyrophobia
Describe the fear
Fear of peanut butter sticking to the roof of the mouth
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
1
What is the fear’s name
Barophobia
Describe the fear
Fear of gravity
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
1
What is the fear’s name
Samhainophobia
Describe the fear
Fear of Halloween
4
Ancraophobia
Fear of wind
Arachibutyrophobia
Fear of peanut butter sticking to the roof of the mouth
Barophobia
Fear of gravity
Cyberphobia
Fear of computers or working on a computer
Kakorrhaphiophobia
Fear of failure or defeat
Lutraphobia
Fear of otters
Samhainophobia
Fear of Halloween
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
5
Goodbye Fears
Explanation / Answer
PhobiaHashTable.java
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Hashtable;
import java.util.Set;
public class PhobiaHashTable {
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
BufferedReader scan = new BufferedReader(new InputStreamReader(System.in));
Hashtable<String, Phobia> table = new Hashtable<String, Phobia>();
System.out.println("Welcome to the fear hash table! ");
int choice = 0;
while (true){
System.out.println("Enter: 1. To add a fear 2. To remove a fear 3. To look up a fear 4. Print all fears 5. Quit");
choice = Integer.parseInt(scan.readLine());
switch(choice){
case 1: addFear(scan, table); break;
case 2: removeFear(scan, table); break;
case 3: lookUpFear(scan, table); break;
case 4: printFears(table); break;
case 5: System.exit(0); break;
}
}
}
public static void addFear(BufferedReader scan, Hashtable<String, Phobia> table) throws IOException{
System.out.println("What is the fear’s name");
Phobia p = new Phobia();
String name = scan.readLine();
p.setName(name);
System.out.println("Describe the fear");
String description = scan.readLine();
p.setDescription(description);
table.put(name, p);
System.out.println("Fear details added");
}
public static void removeFear(BufferedReader scan, Hashtable<String, Phobia> table) throws IOException{
System.out.println("Enter the fear’s name that to be removed");
String name = scan.readLine();
table.remove(name);
System.out.println("Fear removed");
}
public static void lookUpFear(BufferedReader scan, Hashtable<String, Phobia> table) throws IOException{
System.out.println("Enter the fear’s name");
String name = scan.readLine();
Phobia p = (Phobia)table.get(name);
System.out.println(p.toString());
}
public static void printFears(Hashtable<String, Phobia> table){
Set<String> keys = table.keySet();
for(String key: keys){
Phobia p = table.get(key);
System.out.println(p.toString());
}
}
}
Phobia.java
public class Phobia {
private String name;
private String description;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String toString(){
return getName() +" :: "+getDescription();
}
public boolean equlas(Phobia p){
if(name.equals(p.getName())){
return true;
}
else{
return false;
}
}
}
Output:
Welcome to the fear hash table!
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
1
What is the fear’s name
Ancraophobia
Describe the fear
Fear of wind
Fear details added
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
1
What is the fear’s name
Cyberphobia
Describe the fear
Fear of computers or working on a computer
Fear details added
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
1
What is the fear’s name
Lutraphobia
Describe the fear
Fear of otters
Fear details added
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
1
What is the fear’s name
Barophobia
Describe the fear
Fear of gravity
Fear details added
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
4
Ancraophobia :: Fear of wind
Cyberphobia :: Fear of computers or working on a computer
Barophobia :: Fear of gravity
Lutraphobia :: Fear of otters
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
2
Enter the fear’s name that to be removed
Lutraphobia
Fear removed
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
4
Ancraophobia :: Fear of wind
Cyberphobia :: Fear of computers or working on a computer
Barophobia :: Fear of gravity
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
3
Enter the fear’s name
Cyberphobia
Enter:
1. To add a fear
2. To remove a fear
3. To look up a fear
4. Print all fears
5. Quit
5
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