java完成單詞搜刮迷宮游戲。本站提示廣大學習愛好者:(java完成單詞搜刮迷宮游戲)文章只能為提供參考,不一定能成為您想要的結果。以下是java完成單詞搜刮迷宮游戲正文
本文實例講述了java完成單詞搜刮迷宮游戲。分享給年夜家供年夜家參考。詳細剖析以下:
我們在雜志上,常常可以或許看到找單詞的小游戲,在一個二維表格中,存在各類字母,我們可以從八個偏向找單詞。這個用盤算機處置非常便利,然則,算法的利害很主要,由於如果用蠻力算法完成,那末消耗的時光是弗成想象的。
這是數據構造與成績求解Java說話描寫一書中給的完成思緒
完全代碼以下,正文寫的很明確了
import java.io.BufferedReader; import java.io.FileReader; import java.io.InputStreamReader; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; import java.util.List; /** * 單詞搜刮迷宮 * * */ public class WordSearch { /** * 在結構函數中結構兩個輸出流,單詞的輸出流,和表格的輸出流 * */ public WordSearch( ) throws IOException { puzzleStream = openFile( "輸出表格文件途徑:" ); wordStream = openFile( "輸出單詞文件途徑:" ); System.out.println( "文件讀取中..." ); readPuzzle( ); readWords( ); } /** * @return matches 共有若干個單詞婚配 * 依照每一個地位從八個偏向搜刮 * rd 表現行上得增量,eg:rd=-1,表現向上一行 * cd 表現列上得增量 eg:cd=-1。表現向左一步 * 所以rd=1,cd=0表現南 * rd=-1,cd=0表現北, * rd=-1,cd=1,表現西南 */ public int solvePuzzle( ) { int matches = 0; for( int r = 0; r < rows; r++ ) for( int c = 0; c < columns; c++ ) for( int rd = -1; rd <= 1; rd++ ) for( int cd = -1; cd <= 1; cd++ ) if( rd != 0 || cd != 0 ) matches += solveDirection( r, c, rd, cd ); return matches; } /** * 在指定的坐標上,依照給定的偏向搜刮,前往婚配的單詞數目 * @return number of matches */ private int solveDirection( int baseRow, int baseCol, int rowDelta, int colDelta ) { String charSequence = ""; int numMatches = 0; int searchResult; charSequence += theBoard[ baseRow ][ baseCol ]; for( int i = baseRow + rowDelta, j = baseCol + colDelta; i >= 0 && j >= 0 && i < rows && j < columns; i += rowDelta, j += colDelta ) { charSequence += theBoard[ i ][ j ]; searchResult = prefixSearch( theWords, charSequence ); /** * 上面的 if( searchResult == theWords.length ) * 必需要斷定,不然會湧現越界的風險,及當最初一個單詞之婚配前綴時,前往的是索引-1 * */ if( searchResult == theWords.length ) break; /** * 假如沒有呼應的前綴,直接跳過這個基點的搜刮,即便持續搜刮,做的也是無用功 * */ if( !theWords[ searchResult ].startsWith( charSequence ) ) break; if( theWords[ searchResult ].equals( charSequence ) ) { numMatches++; System.out.println( "發明了 " + charSequence + " 在 " + baseRow+1 + "行 " + baseCol + " 列 " + i + " " + j ); } } return numMatches; } /** * 先說明Arrays.binarySearch(Object[] ,Object) * 應用二進制搜刮算法來搜刮指定命組,以取得指定對象。在停止此挪用之前, * 必需依據數組元素的天然次序 對數組停止升序排序(經由過程下面的 Sort(Object[] 辦法)。 * 假如沒有對數組停止排序,則成果是不明白的。(假如數組包括弗成互相比擬的元素(例如,字符串和整數), * 則沒法 依據數組元素的天然次序對數組停止排序,是以成果是不明白的。) * 假如數組包括多個等於指定對象的元素,則沒法包管找到的是哪個。 */ private static int prefixSearch( String [ ] a, String x ) { int idx = Arrays.binarySearch( a, x ); if( idx < 0 ) return -idx - 1; else return idx; } /** * 讀取文件內容,取得輸出流 */ private BufferedReader openFile( String message ) { String fileName = ""; FileReader theFile; BufferedReader fileIn = null; do { System.out.println( message + ": " ); try { fileName = in.readLine( ); if( fileName == null ) System.exit( 0 ); theFile = new FileReader( fileName ); fileIn = new BufferedReader( theFile ); } catch( IOException e ) { System.err.println( "Cannot open " + fileName ); } } while( fileIn == null ); System.out.println( "Opened " + fileName ); return fileIn; } /** * 讀入表格 * */ private void readPuzzle( ) throws IOException { String oneLine; List<String> puzzleLines = new ArrayList<String>( ); if( ( oneLine = puzzleStream.readLine( ) ) == null ) throw new IOException( "No lines in puzzle file" ); columns = oneLine.length( ); puzzleLines.add( oneLine ); while( ( oneLine = puzzleStream.readLine( ) ) != null ) { if( oneLine.length( ) != columns ) System.err.println( "Puzzle is not rectangular; skipping row" ); else puzzleLines.add( oneLine ); } rows = puzzleLines.size( ); theBoard = new char[ rows ][ columns ]; int r = 0; for( String theLine : puzzleLines ) theBoard[ r++ ] = theLine.toCharArray( ); } /** * 讀取曾經依照字典排序的單詞列表 */ private void readWords( ) throws IOException { List<String> words = new ArrayList<String>( ); String lastWord = null; String thisWord; while( ( thisWord = wordStream.readLine( ) ) != null ) { if( lastWord != null && thisWord.compareTo( lastWord ) < 0 ) { System.err.println( "沒有依照字典次序排序,此次跳過" ); continue; } words.add( thisWord.trim() ); lastWord = thisWord; } theWords = new String[ words.size( ) ]; theWords = words.toArray( theWords ); } // Cheap main public static void main( String [ ] args ) { WordSearch p = null; try { p = new WordSearch( ); } catch( IOException e ) { System.out.println( "IO Error: " ); e.printStackTrace( ); return; } System.out.println( "正在搜刮..." ); p.solvePuzzle( ); } private int rows; private int columns; private char [ ][ ] theBoard; private String [ ] theWords; private BufferedReader puzzleStream; private BufferedReader wordStream; private BufferedReader in = new BufferedReader( new InputStreamReader( System.in ) ); }
願望本文所述對年夜家的java法式設計有所贊助。