1 | //Omar Khan |
2 | //CSE 143 Section AA |
3 | |
4 | import java.util.*; |
5 | import java.io.*; |
6 | |
7 | //This program builds a tree for a game similar to 20 questions using QuestionNodes |
8 | //and displays it using the passed UserInterface object. It also keeps track of the total |
9 | //games played and won for an instance of play. |
10 | |
11 | public class QuestionTree{
|
12 | private UserInterface ui; |
13 | private QuestionNode root; |
14 | private int played; |
15 | private int won; |
16 | |
17 | //Passes in the UserInterface and starts the tree with a single QuestionNode that contains the answer "Computer". |
18 | //Throws an IllegalArgumentException if UserInterface is null |
19 | public QuestionTree(UserInterface ui){
|
20 | //Checks if passed in ui is null and throws an exception accordingly |
21 | if(ui == null){
|
22 | throw new IllegalArgumentException(); |
23 | } |
24 | this.ui = ui; |
25 | this.played = 0; |
26 | this.won = 0; |
27 | root = new QuestionNode("computer");
|
28 | } |
29 | |
30 | //This method is used to play a game, it builds the question tree as the game progresses. |
31 | public void play(){
|
32 | played++; |
33 | root = play(root); |
34 | } |
35 | |
36 | //Helper method to play the game, returns a |
37 | //QuestionNode and requires a QuestionNode be passed in. |
38 | private QuestionNode play(QuestionNode otherRoot){
|
39 | if(otherRoot.isAnswer()){
|
40 | ui.print("Would your object happen to be " + otherRoot.data + "?");
|
41 | if(ui.nextBoolean()){
|
42 | won++; |
43 | ui.println("I win!");
|
44 | return otherRoot; |
45 | }else{
|
46 | ui.print("I lose. What is your object?");
|
47 | String answer = ui.nextLine(); |
48 | ui.print("Type a yes/no question to distinguish your item from " + otherRoot.data + ":");
|
49 | String question = ui.nextLine(); |
50 | ui.print("And what is the answer for your object?");
|
51 | |
52 | otherRoot = add(otherRoot, question, answer, ui.nextBoolean()); |
53 | return otherRoot; |
54 | } |
55 | }else{
|
56 | ui.print(otherRoot.data); |
57 | if(ui.nextBoolean()){
|
58 | otherRoot.yes = play(otherRoot.yes); |
59 | }else{
|
60 | otherRoot.no = play(otherRoot.no); |
61 | } |
62 | } |
63 | return otherRoot; |
64 | } |
65 | |
66 | //Helper method to add a new question and answer, used to expand the tree. |
67 | private QuestionNode add(QuestionNode otherRoot,String question, String answer, boolean y){
|
68 | QuestionNode currQuestion = new QuestionNode(question); |
69 | if(y){
|
70 | currQuestion.yes = new QuestionNode(answer); |
71 | currQuestion.no = otherRoot; |
72 | }else{
|
73 | currQuestion.yes = otherRoot; |
74 | currQuestion.no = new QuestionNode(answer); |
75 | } |
76 | |
77 | return currQuestion; |
78 | } |
79 | |
80 | //This method saves the contents of the tree in an appropriate |
81 | //format to the passed in PrintStream object. |
82 | //Throws an IllegalArgumentException if passed PrintStream is null |
83 | public void save(PrintStream output){
|
84 | if(output == null){
|
85 | throw new IllegalArgumentException(); |
86 | } |
87 | save(output, root); |
88 | } |
89 | |
90 | //Helper method for save which takes in a PrintStream object and a QuestionNode. |
91 | private void save(PrintStream output, QuestionNode otherRoot){
|
92 | if(otherRoot.isAnswer()){
|
93 | output.println("A:" + otherRoot.data);
|
94 | }else{
|
95 | output.println("Q:" + otherRoot.data);
|
96 | save(output, otherRoot.yes); |
97 | save(output, otherRoot.no); |
98 | } |
99 | } |
100 | |
101 | //This method builds a new tree using the contents of a passed in Scanner object. |
102 | //Throws an IllegalArgumentException if passed Scanner is null. |
103 | public void load(Scanner input){
|
104 | if(input == null){
|
105 | throw new IllegalArgumentException(); |
106 | } |
107 | root = load(input, root); |
108 | } |
109 | |
110 | //Helper method that takes in a Scanner object |
111 | //and a QustionNode, also returns a QuestionNode. |
112 | private QuestionNode load(Scanner input, QuestionNode otherRoot){
|
113 | if(!input.hasNextLine()){
|
114 | return otherRoot; |
115 | }else{
|
116 | String data = input.nextLine(); |
117 | otherRoot = new QuestionNode(data.substring(2)); |
118 | if(data.startsWith("Q:")){
|
119 | otherRoot.yes = load(input, otherRoot.yes); |
120 | otherRoot.no = load(input, otherRoot.no); |
121 | } |
122 | } |
123 | return otherRoot; |
124 | } |
125 | |
126 | //Returns the total games won. |
127 | public int gamesWon(){
|
128 | return won; |
129 | } |
130 | |
131 | //Returns total games played. |
132 | public int totalGames(){
|
133 | return played; |
134 | } |
135 | } |
Began life as a copy of #1002516
Travelled to 12 computer(s): aoiabmzegqzx, bhatertpkbcr, cbybwowwnfue, gwrvuhgaqvyk, ishqpsrjomds, lpdgvwnxivlt, mqqgnosmbjvj, pyentgdyhuwx, pzhvpgtvlbxg, tslmcundralx, tvejysmllsmz, vouqrxazstgt
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| Snippet ID: | #1002517 |
| Snippet name: | Java text game / QuestionTree |
| Eternal ID of this version: | #1002517/1 |
| Text MD5: | a5251402e12325521f1f6ee485f891cc |
| Author: | stefan |
| Category: | |
| Type: | Java source code |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2016-01-29 18:34:36 |
| Source code size: | 4542 bytes / 135 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 3030 / 192 |
| Referenced in: | [show references] |