Think Java 12以降

背景・理由

立派なプログラマーになるためにThink Javaを学びます。
chap12以降はゲーム作成なので別立てにします。
#リソース
https://books.trinket.io/thinkjava/

chap 12

語彙

encode
class variable
sequential search
binary search

# ex12_1
 public Card[] makeDeck(){
        Card[] cards = new Card[52];
        int index = 0;
        for (int suit = 0; suit <= 3; suit++) {
            for (int rank = 1; rank <= 13; rank++) {
                cards[index] = new Card(rank, suit);
                index++;
            }
        }
        return cards;
    }

# ex12_2

if (this.rank > that.rank){
         if (that.rank == 1) {
            return -1;
         } 
         else {
            return 1;
         }
      }

# ex12_3

   public static int[] suitHist(Card[] cards){
        int[] result = new int[4];
        for (Card card:cards){
            result[card.getSuit()] += 1;
        }
        return result;
    }
    public static boolean hasFlush(Card [] cards ){
        for (int count:suitHist(cards)){
            if (count >= 5){
                return true;
            }
        }
        return false;
    
    }

言い訳

・プログラム見る
・回答は他の人のを見ました。
・2Dは軽く目を通しました。

chap 13

語彙

pseudocode:
helper method:
top-down development:
selection sort:
merge sort:

# ex13_2
   public static int randomInt(int low, int high){
        return random.nextInt(Math.max(high, low) - Math.min(high, low) + 1) + low;
    }

    public void swapCards(int i, int j) {
        Card temp = cards[i];
        cards[i] = cards[j];
        cards[j] = temp;
    }

    public void shuffle(){
        for (int i=0;i<card.length;i++){
            swapCards(i, randomInt(i, card.length - 1));
        }
    }
# ex13_5
 public String toString() {
        StringBuilder result = new StringBuilder();
        for (int i= 0; i < this.cards.length; i++) {
            result.append(cards[i]);
            result.append('\n');
        }
        return result.toString();
    }

chap 14

語彙

collection:
subclass:
superclass:
wrapper method:
bottom-up development:
HAS-A:
IS-A:

# ex14_1
package ch14;//
//  EightsPlayer.java
//  Chapter14
//
//  Created by Apollo Zhu on 8/20/16.
//  Copyright © 2015-2016 WWITDC. All rights reserved.
//

public class EightsPlayer extends Player {

   private EightsCardCollection eightHand;

   public EightsPlayer(String name){
      super(name);
      eightHand = new EightsCardCollection(name);
   }
   
   /**
    * Gets the player's hand.
    */
   public EightsCardCollection getHand(){ return eightHand;}
   /**
    * Calculates the player's score (penalty points).
    */
   public int score() {
      int sum = 0;
      for(int i = 0; i < getHand().size(); i++){
         sum += getHand().getCardAt(i).score();
      }
      return sum;
   }

   /**
    * Displays the player's hand.
    */
   public void display() { getHand().display();}

   /**
    * Displays the player's name and score.
    */
   public void displayScore() { System.out.println(getName() + "has"  + score() + "points");}

   /**
    * Removes and returns a legal card from the player's hand.
    */
   public EightsCard play(Eights eights, EightsCard prev) {
      EightsCard card = searchForMatch(prev);
      if (card == null){
         card = drawForMatch(eights, prev);
      }
      return card;
   }

   public EightsCard searchForMatch(EightsCard prev) {
      for(int i=0; i < getHand().size(); i++){
         EightsCard card = getHand().getCardAt(i);
         if(card.matches(prev)){
            return getHand().removeAt(i);
         }
      }
      return null;
   }

   public EightsCard drawForMatch(Eights eights, EightsCard prev){
      while (true){
         EightsCard card = eights.draw();
         System.out.println(getName() + " draws " + card);
         if (card.matches(prev)){
            return card;
         }
         getHand().append(card);
      }
   }
}