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‎chapter_07/Project_07_15/Project_07_15.java

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package chapter_07;
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import java.util.Scanner;
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/**
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* 15. Write a program that manages a list of up to 10 players and their high
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* scores in the computer’s memory. Use two arrays to manage the list. One
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* array should store the player’s name and the other array should store the
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* player’s high score. Use the index of the arrays to correlate the name with
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* the score. In the next Programming Project, we ask you to do the same
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* thing, but using an array of a class. Your program should start with zero
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* players in the list and support the following features:
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* a. Add a new player and score. If it is one of the top 10 scores then add it
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* to the list of scores. The same name and score can appear multiple
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* times. For example, if Bill played 3 times and scored 100,100, and 99,
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* and Bob played once and scored 50, then the top scores would be Bill
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* 100, Bill 100, Bill 99, Bob 50.
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* b. Print the top 10 names and scores to the screen sorted by score (highest
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* at the top).
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* c. Allow the user to enter a player name and output that player’s highest
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* score if it is on the top 10 list or a message if the player’s name has not
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* been input or is not in the top 10.
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* d. Allow the user to enter a player name and remove the highest score for
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* that player from the list.
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* Create a menu system that allows the user to select which option to
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* invoke.
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*
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*
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*
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* @author Sharaf Qeshta
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* */
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public class Project_07_15
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{
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private static String[] names = new String[10];
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private static int[] scores = new int[10];
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private static Scanner scanner = new Scanner(System.in);
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public static void main(String[] args)
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{
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while (true)
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start();
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}
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public static void start()
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{
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printOptions();
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System.out.println("\nEnter a choice: ");
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int choice = scanner.nextInt();
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switch (choice)
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{
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case 1 : addPlayer(); break;
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case 2 : printTop10(); break;
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case 3 : search(); break;
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case 4 : remove(); break;
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case 5 : System.exit(0);
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default:
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System.out.println("Invalid Choice");
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}
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}
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public static void printOptions()
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{
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System.out.println("1. Add new player");
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System.out.println("2. Print top 10 players");
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System.out.println("3. Search for a player");
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System.out.println("4. Remove a player");
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System.out.println("5. Exit");
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}
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public static void remove()
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{
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System.out.print("Enter player name: ");
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String playerName = scanner.next();
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int index = -1;
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for (int i = 0; i < 10; i++)
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{
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if (names[i] == null)
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break;
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if (names[i].equals(playerName))
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{
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index = i;
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break;
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}
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}
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if (index == -1)
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{
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System.out.println("the name is not exist");
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return;
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}
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for (int i = index; i < scores.length-1; i++)
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{
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names[i] = names[i+1];
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scores[i] = scores[i+1];
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}
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names[names.length-1] = null;
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scores[scores.length-1] = 0;
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}
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public static void search()
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{
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System.out.print("Enter player name: ");
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String playerName = scanner.next();
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for (int i = 0; i < 10; i++)
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{
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if (names[i] == null)
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{
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System.out.println(playerName + " is not exist");
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break;
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}
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if (names[i].equals(playerName))
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{
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System.out.println(playerName + " highest score : " + scores[i]);
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return;
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}
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}
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System.out.println(playerName + " is not on the top ten");
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}
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public static void printTop10()
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{
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for (int i = 0; i < 10; i++)
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{
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if (names[i] == null)
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break;
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System.out.println(names[i] + " : " + scores[i]);
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}
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}
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public static void addPlayer()
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{
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System.out.print("Enter player name: ");
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String playerName = scanner.next();
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System.out.print("Enter player score: ");
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int score = scanner.nextInt();
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int index = 0;
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for (int i = scores.length-1; i > -1; i--)
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{
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if (score <= scores[i])
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{
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index = i + 1;
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break;
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}
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}
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for (int i = index; i < scores.length-1; i++)
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{
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String indexName = names[i+1];
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int indexScore = scores[i+1];
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names[i+1] = names[index];
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scores[i+1] = scores[index];
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names[index] = indexName;
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scores[index] = indexScore;
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}
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if (index < scores.length)
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{
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names[index] = playerName;
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scores[index] = score;
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}
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}
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}

‎chapter_07/Project_07_16/Player.java

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package chapter_07;
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public class Player
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{
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String name;
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int score;
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public Player(String name, int score)
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{
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this.name = name;
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this.score = score;
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}
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}

‎chapter_07/Project_07_16/Project_07_16.java

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package chapter_07;
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import java.util.Scanner;
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/**
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* 16. Do Programming Project 15 except use a class named Player to store a
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* player’s name and score. Use a single array of type Player. Be sure to
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* include a constructor with this class that sets the name and score.
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*
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*
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* @author Sharaf Qeshta
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* */
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public class Project_07_16
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{
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private static Player[] players = new Player[10];
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private static Scanner scanner = new Scanner(System.in);
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public static void main(String[] args)
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{
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while (true)
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start();
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}
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public static void start()
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{
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printOptions();
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System.out.println("\nEnter a choice: ");
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int choice = scanner.nextInt();
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switch (choice)
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{
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case 1 : addPlayer(); break;
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case 2 : printTop10(); break;
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case 3 : search(); break;
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case 4 : remove(); break;
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case 5 : System.exit(0);
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default:
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System.out.println("Invalid Choice");
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}
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}
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public static void printOptions()
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{
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System.out.println("1. Add new player");
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System.out.println("2. Print top 10 players");
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System.out.println("3. Search for a player");
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System.out.println("4. Remove a player");
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System.out.println("5. Exit");
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}
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public static void remove()
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{
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System.out.print("Enter player name: ");
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String playerName = scanner.next();
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int index = -1;
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for (int i = 0; i < 10; i++)
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{
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if (players[i] == null)
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break;
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if (players[i].name.equals(playerName))
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{
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index = i;
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break;
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}
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}
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if (index == -1)
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{
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System.out.println("the name is not exist");
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return;
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}
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for (int i = index; i < players.length-1; i++)
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players[i] = players[i+1];
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players[players.length-1] = null;
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}
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public static void search()
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{
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System.out.print("Enter player name: ");
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String playerName = scanner.next();
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for (int i = 0; i < 10; i++)
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{
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if (players[i] == null)
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{
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System.out.println(playerName + " is not exist");
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break;
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}
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if (players[i].name.equals(playerName))
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{
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System.out.println(playerName + " highest score : " + players[i].score);
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return;
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}
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}
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System.out.println(playerName + " is not on the top ten");
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}
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public static void printTop10()
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{
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for (int i = 0; i < 10; i++)
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{
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if (players[i] == null)
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break;
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System.out.println(players[i].name + " : " + players[i].score);
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}
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}
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public static void addPlayer()
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{
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System.out.print("Enter player name: ");
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String playerName = scanner.next();
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System.out.print("Enter player score: ");
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int score = scanner.nextInt();
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int index = 0;
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for (int i = players.length-1; i > -1; i--)
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{
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if (players[i] == null)
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continue;
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if (score <= players[i].score)
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{
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index = i + 1;
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break;
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}
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}
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for (int i = index; i < players.length-1; i++)
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{
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Player indexPlayer = players[i+1];
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players[i+1] = players[index];
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players[index] = indexPlayer;
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}
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if (index < players.length)
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{
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players[index] = new Player(playerName, score);
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}
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}
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}

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