如果找到单词，我很难将我的布尔值更改为true。
import java.util.Scanner;
public class WordSearch
{
private char[][] array;
private boolean found;
public WordSearch(char[][] inArray)
{
array = inArray;
}
public void play()
{
Scanner in = new Scanner(System.in);
String choice = "";
while(!choice.equals("end"))
{
print();
System.out.println("What word do you want to search for? (Type end to quit)");
choice = in.nextLine();
System.out.println();
switch (choice)
{
case "end":
break;
default:
search(choice);
break;
}
}
}
public void print()
{
for(int i = 0; i < array.length; i++)
{
for(int j = 0; j < array[0].length; j++)
{
System.out.print(array[i][j]);
}
System.out.println();
}
System.out.println();
}
public void search(String inWord)
{
// Puts inWord into an array
char[] word = new char[inWord.length()];
for(int i = 0; i < inWord.length(); i++)
{
word[i] = inWord.charAt(i);
}
for(int i = 0; i < array.length; i++)// goes to each row
{
for(int j = 0; j < array[0].length; j++)// goes through every letter
{
if(array[i][j] == word[0])// asks if it matches
{
lookHorizantal(word, array, i, j, found);
lookVertical(word, array, i, j, found);
lookDiagnal(word, array, i, j, found);
}
}
}
if(!found)
{
System.out.println(inWord + "was not found!");
}
System.out.println();
}
public void lookHorizantal(char[] inWord, char[][] inArray, int row, int column, boolean ifFound)
{
int counter = 1; //set this to one because we already found the first letter
column += 1;
for(int i = 0; i < inWord.length; i++)
{
if(column < 15 && counter < inWord.length)
{
if(inArray[row][column] == inWord[counter])
{
//System.out.println("WE FOUND A LETTER AT COLUMN: " + row + " Row: " + column);
counter += 1;
column += 1;
}
}
}
if(counter == inWord.length)
{
ifFound = true;
System.out.println(printChar(inWord) + " found horizontally at row " + row + " and column " + (column - counter) + "!");
}
}
public void lookVertical(char[] inWord, char[][] inArray, int row, int column, boolean ifFound)
{
int counter = 1; //set this to one because we already found the first letter
row += 1;
for(int i = 0; i < inWord.length; i++)
{
if(row < 10 && counter < inWord.length)
{
if(inArray[row][column] == inWord[counter])
{
//System.out.println("WE FOUND A LETTER AT COLUMN: " + row + " Row: " + column);
counter += 1;
row += 1;
}
}
}
if(counter == inWord.length)
{
ifFound = true;
System.out.println(printChar(inWord) + " found vertically at row " + (row - counter) + " and column " + column + "!");
}
}
public void lookDiagnal(char[] inWord, char[][] inArray, int row, int column, boolean ifFound)
{
int counter = 1; //set this to one because we already found the first letter
row += 1;
column += 1;
for(int i = 0; i < inWord.length; i++)
{
if(row < 10 && column < 15 && counter < inWord.length)
{
if(inArray[row][column] == inWord[counter])
{
//System.out.println("WE FOUND A LETTER AT COLUMN: " + row + " Row: " + column);
counter += 1;
row += 1;
column +=1;
}
}
}
if(counter == inWord.length)
{
ifFound = true;
System.out.println(printChar(inWord) + " found diagnolly at row " + (row - counter) + " and column " + (column - counter) + "!");
}
}
public String printChar(char[] inChar)
{
String complete = "";
for(int i = 0; i < inChar.length; i++)
{
complete += inChar[i];
}
return complete;
}
}
每当我找到一个单词时，它返回false并运行未找到的单词。我没有声明布尔对吗？还是在它退出方法时重置？
如果你想测试它，请看驱动程序：
import java.util.*;
import java.io.*;
public class Driver
{
public static void main (String[] args)
{
// try block needed to read in file
try
{
//open the file "sampleSearch.txt"
FileReader fileName = new FileReader("sampleSearch.txt");
Scanner fileRead = new Scanner(fileName);
//read in the number of rows
int numRow = fileRead.nextInt();
fileRead.nextLine();
//read in the number of columns
int numCol = fileRead.nextInt();
fileRead.nextLine();
//create a 2d array to hold the characters in the file
char[][] array = new char[numRow][numCol];
//for each row in the file
for (int r = 0; r < numRow; r++)
{
//read in the row as a string
String row = fileRead.nextLine();
//parse the string into a sequence of characters
for (int c = 0; c < numCol; c++)
{
//store each character in the 2d array
array[r][c] = row.charAt(c);
}
}
//create a new instance of the WordSearch class
WordSearch ws = new WordSearch(array);
//play the game
ws.play();
}
catch (FileNotFoundException exception)
{
//error is thrown if file cannot be found. See directions or email me...
System.out.println("File Not Found");
}
}
}
和heres sampleSearch.txt：
10
15
fqexfecmxdvjlgu
cxomfslieyitqtz
nucatfakuxofegk
hfytpnsdlhcorey
pgrhdqsypyscped
ckadhyudtioapje
yerjodxnqzztfmf
hypmmgoronkzhuo
hdskymmpkzokaao
amuewqvtmrlglad
答案 0 :(得分：6)
您无法在被调用的方法中修改不可变原语布尔值（甚至是布尔包装器），对方法的更改不会保留在方法之外。相反，你有两个选择 -
答案 1 :(得分：3)
当你传递found作为参数时，你传递的是它的值，而不是对它的引用，所以基本上你要创建一个方法实例变量。
我建议两个选项
第一个是返回值：
found = lookHorizantal(word, array, i, j);
// Maybe check between these search calls if it is found?
found = lookVertical(word, array, i, j);
// Maybe check between these search calls
found = lookDiagnal(word, array, i, j);
// Maybe check between these search calls if it is found?
public boolean lookHorizantal(char[] inWord, char[][] inArray, int row, int column)
{
// OMITTED CODE
if(counter == inWord.length)
{
return true; /*******************/
// OMITTED CODE
}
}
或只引用类变量：
public void lookHorizantal(char[] inWord, char[][] inArray, int row, int column)
{
// OMITTED CODE
if(counter == inWord.length)
{
found = true; /*******************/
// OMITTED CODE
}
}
这些开关将直接更改类变量found。