Question

State Lookup Table:

Below are two tables, stateStrings (50 rows by 6 columns) and stateInts (50 rows by 3 columns), that contain data for the 50 states. Below are examples for the first state, Alabama:

stateStrings:

State Abbrev	Name	Capital	Largest City	Governor	Political Party
AL	Alabama	Montgomery	Birmingham	Robert Julian Bentley	Republican

stateInts:

State Index	Population	Electoral Votes
0	4,858,979	9

Write a java application that uses the full tables below to look up the corresponding data using the “Main menu” approach described in the sample output below. You can use a switch statement to handle the choice entered. You must be able to handle mixed case input for the state abbreviation (ar, AR, aR, Ar) and you must format the population data with commas (e.g. 1,234,567) by importing the DecimalFormat class in the java.text library, create an object of that type, and then use the format instance method in that class to format the population with commas.

Sample run:

Enter a state abbreviation code: ar

State abbreviation code: AR

State index: 3

Main menu

1: Name

2: Capital

3: Largest City

4: Governor

5: Political Party

6: Population

7: Electoral Votes

8: Exit

Enter a choice: 1

Name: Arkansas

Main menu

1: Name

2: Capital

3: Largest City

4: Governor

5: Political Party

6: Population

7: Electoral Votes

8: Exit

Enter a choice: 2

Capital: Little Rock

Main menu

1: Name

2: Capital

3: Largest City

4: Governor

5: Political Party

6: Population

7: Electoral Votes

8: Exit

Enter a choice: 3

Largest city: Little Rock

Main menu

1: Name

2: Capital

3: Largest City

4: Governor

5: Political Party

6: Population

7: Electoral Votes

8: Exit

Enter a choice: 4

Governor: Asa Hutchinson

Main menu

1: Name

2: Capital

3: Largest City

4: Governor

5: Political Party

6: Population

7: Electoral Votes

8: Exit

Enter a choice: 5

Governor's political party: Republican

Main menu

1: Name

2: Capital

3: Largest City

4: Governor

5: Political Party

6: Population

7: Electoral Votes

8: Exit

Enter a choice: 6

Population: 3,020,327

Main menu

1: Name

2: Capital

3: Largest City

4: Governor

5: Political Party

6: Population

7: Electoral Votes

8: Exit

Enter a choice: 7

Electoral votes: 6

Main menu

1: Name

2: Capital

3: Largest City

4: Governor

5: Political Party

6: Population

7: Electoral Votes

8: Exit

Enter a choice: 8

Answer 1

StateStrings.java

/** * Utility Class to store the information of a single state * @author * */ public class StateStrings { // private instance variables private String stateAbbrev; private String name; private String capital; private String largestCity; private String governor; private String politicalParty; // default constructor public StateStrings() { } // parameterized constructor public StateStrings(String stateAbbrev, String name, String capital, String largestCity, String governor, String politicalParty) { this.stateAbbrev = stateAbbrev; this.name = name; this.capital = capital; this.largestCity = largestCity; this.governor = governor; this.politicalParty = politicalParty; } // method to return the state abbreviation public String getStateAbbrev() { return stateAbbrev; } // method to return the name of state public String getName() { return name; } // method to return capital of the state public String getCapital() { return capital; } // method to return the largest city of the state public String getLargestCity() { return largestCity; } // method to return the governor of the state public String getGovernor() { return governor; } // method to return the political party of the state public String getPoliticalParty() { return politicalParty; } // method to set the state abbreviation public void setStateAbbrev(String stateAbbrev) { this.stateAbbrev = stateAbbrev; } // method to set the name of the state public void setName(String name) { this.name = name; } // method to set the capital of the state public void setCapital(String capital) { this.capital = capital; } // method yo set the largest city of the state public void setLargestCity(String largestCity) { this.largestCity = largestCity; } // method to set the governor of the state public void setGovernor(String governor) { this.governor = governor; } // method to set the political party of the state public void setPoliticalParty(String politicalParty) { this.politicalParty = politicalParty; } }

StateInts.java

/** * Utility class to store a single state's population, index, and electoral votes * @author * */ public class StateInts { // private instance variables private int stateIndex; private long population; private int electoralVotes; // default constructor public StateInts() { stateIndex = -1; population = 0; electoralVotes = 0; } // parameterized constructor public StateInts(int stateIndex, long population, int electoralVotes) { this.stateIndex = stateIndex; this.population = population; this.electoralVotes = electoralVotes; } // method to return the state index public int getStateIndex() { return stateIndex; } // method to return the state population public long getPopulation() { return population; } // method to return the electoral votes public int getElectoralVotes() { return electoralVotes; } // method to set state index public void setStateIndex(int stateIndex) { this.stateIndex = stateIndex; } // method to set population of the state public void setPopulation(long population) { this.population = population; } // method to set the state electoral votes public void setElectoralVotes(int electoralVotes) { this.electoralVotes = electoralVotes; } }

StateTable.java

/** * Composite class which holds the object of StateStrings and StateInts for a single state * @author * */ public class StateTable { // instance variables of StateStrings and StateInts // for a single state private StateStrings stateStrings; private StateInts stateInts; // default constructor public StateTable() { stateStrings = new StateStrings(); stateInts = new StateInts(); } // parameterized constructor public StateTable(StateStrings stateStrings, StateInts stateInts) { this.stateStrings = stateStrings; this.stateInts = stateInts; } // methdo to return the state string object public StateStrings getStateStrings() { return stateStrings; } // methdo tos get stateints object public StateInts getStateInts() { return stateInts; } // method to set state string instance to the state public void setStateStrings(StateStrings stateStrings) { this.stateStrings = stateStrings; } // method to set the state int object public void setStateInts(StateInts stateInts) { this.stateInts = stateInts; } }

StateLookupTable.java (Driver File)

import java.text.DecimalFormat; import java.util.Scanner; /** * Driver file to run the state table * @author * */ public class StateLookupTable { public static void main(String args[]) { String abbv; Scanner kb = new Scanner(System.in); // array to store the state info StateTable[] table = new StateTable[50]; // adding data to table // here 5 states are stored in the array // but you can store more if you want table[0] = new StateTable(new StateStrings("AL", "Alabama", "Montgomery", "Birmingham", "Robert Julian Bentley", "Republican"), new StateInts(0, 4858979, 9)); table[1] = new StateTable(new StateStrings("AK", "Alaska", "Juneau", "Anchorage", "Bill Walker", "Independent"), new StateInts(1, 739795, 3)); table[2] = new StateTable(new StateStrings("AZ", "Arizona", "Phoenix", "Phoenix", "Doug Ducey", "Republican"), new StateInts(2, 7016270, 11)); table[3] = new StateTable(new StateStrings("AR", "Arkansas", "Little Rock", "Little Rock", "Asa Hutchinson", "Republican"), new StateInts(3, 3004279, 6)); table[4] = new StateTable(new StateStrings("CA", "California", "Sacramento", "Los Angeles", "Jerry Brown", "Democratic"), new StateInts(4, 39536653, 55)); System.out.print("Enter a state abbreviation code: "); abbv = kb.nextLine(); int index = getIndex(table, abbv); if(index == -1) { System.out.println("No such state with that abbreviation exist in the StateTable array."); System.out.println("Please store that state information first in the array"); } else { int choice = mainMenu(); while(choice != 8) { processChoice(table, index, choice); choice = mainMenu(); if(choice == 8) { System.out.println("\nGoodBye..."); } } } } // static method to process input choice public static void processChoice(StateTable[] table, int index, int choice) { if(choice == 1) { System.out.println("Name: " + table[index].getStateStrings().getName()); } else if(choice == 2) { System.out.println("Capital: " + table[index].getStateStrings().getCapital()); } else if(choice == 3) { System.out.println("Largest City: " + table[index].getStateStrings().getLargestCity()); } else if(choice == 4) { System.out.println("Governor: " + table[index].getStateStrings().getGovernor()); } else if(choice == 5) { System.out.println("Political Party: " + table[index].getStateStrings().getPoliticalParty()); } else if(choice == 6) { DecimalFormat putComma = new DecimalFormat("#,###"); long pop = table[index].getStateInts().getPopulation(); System.out.println("Population: " + putComma.format(pop)); } else if(choice == 7) { System.out.println("Electoral Votes: " + table[index].getStateInts().getElectoralVotes()); } System.out.println(); } // method to show menu to the user and do validation // and return the input choice public static int mainMenu() { int choice = -1; Scanner kb = new Scanner(System.in); while(choice < 1 || choice > 8) { System.out.println("Main menu"); System.out.println("1: Name"); System.out.println("2: Capital"); System.out.println("3: largest City"); System.out.println("4: Governor"); System.out.println("5: Political Party"); System.out.println("6: Population"); System.out.println("7: Electoral Votes"); System.out.println("8: Exit"); System.out.print("Enter a choice: "); choice = Integer.parseInt(kb.nextLine()); if(choice < 1 || choice > 8) { System.out.println("Error! Invalid Input. input must be in range 1 to 8.\n"); } } return choice; } // method to return the index of a particular state abbreviation // into state array public static int getIndex(StateTable[] table, String abbv) { for(int i = 0; i < 50; i++) { if(table[i] == null) return -1; if(table[i].getStateStrings().getStateAbbrev().equalsIgnoreCase(abbv)) return i; } return -1; } }

OUTPUT

$Console 3 <terminated> StatelookupTable [Java Application] C:\Program Files\Java Enter a state abbreviation code: Ar Main menu 1: Name 2: Capital 3: largest City 4: Governor 5: Political Party 6: Population 7: Electoral Votes 8: Exit Enter a choice: 1 Name: Arkansas Main menu 1: Name 2: Capital 3:largest City 4: Governor 5: Political Party 6: Population 7: Electoral Votes 8: Exit Enter a choice: 4 Governor: Asa Hutchinson Main menu 1: Name 2: Capital 3:largest City 4: Governor 5: Political Party 6: Population 7: Electoral Votes 8: Exit$

Instructions: Total 4 java classes have been used to create the application. StateStrings and StateInts have been created as 2 different classes. Another composite class is created to combine the objects of the former two classes to be put into one single unit known as StateTable class and finally, one driver file StateLookupTable has been created to run the application. In the main method of StateLookupTable class, an array of size 50 of StateTable has been created to store the info of 50 states.

Create the 4 java files with the exact names as given in table headers (underlined and bolded) and then copy-paste the codes into their respective files and save. Please note that only 5 states info have been stored into the state table array in the main method to test the application but you can store the remaining state info into the array. Finally, run the driver file StateLookupTable.java