[英]Want to randomly choose word from text file and instead printing everything from text file
我希望编译器从文本中randomly
选择一个单词,而不是从文本文件中打印所有内容。 现在下面的代码正在打印文本文件中的所有内容。 我认为我的getWord
方法有问题,因为当我从主函数调用getWord
方法时error
。
public class TextFile {
protected static Scanner file;
protected static List<String> words;
public TextFile(){
words = openFile();
}
private List<String> openFile() {
//List<String> wordList = new ArrayList<String>();
try {
file = new Scanner(new File("words.txt"));
} catch (FileNotFoundException e) {
System.out.println("File Not Found");
} catch (Exception e) {
System.out.println("IOEXCEPTION");
}
return words;
}
public void readFile() throws FileNotFoundException {
//ArrayList<String> wordList = new ArrayList<String>();
while(file.hasNext()){
String a = file.nextLine();
//Collections.shuffle(words);
//String pickWord = words.get(1);
//String[] a =
System.out.println(a);
}
}
public void closeFile() {
file.close();
}
public String getWord() {
Random r = new Random(words.size());
String randomWord = words.get(r.nextInt());
//System.out.println(randomWord);
return randomWord;
}
public static void main(String[] args) throws FileNotFoundException {
try {
TextFile file = new TextFile();
file.openFile();
file.readFile();
file.closeFile();
} catch (Exception e) {
System.out.println("IOEXCEPTION");
}
}
}
在 openfile 方法中,您正在重新调整一个“word”变量,该变量为空,为变量赋值
错误来自 {getword();} 因为您正在访问空变量的属性,这是一个错误
public List<String> readFile() throws FileNotFoundException {
while(file.hasNext()){
String a = file.nextLine();
words.add(a);
System.out.println(a);
}
return words;
}
在返回语句行的打开文件方法中调用“return readfile();” 并尝试您的代码\\
无需在 main 方法中调用 readfile 方法
您在调用 getWord 方法时遇到异常,因为它在String randomWord = words.get(r.nextInt());
行处抛出IndexOutOfBoundsException
.
对getWord
方法的 PFB 修正:
public String getWord() {
//You can use any approach..Random or Collections
//Random r = new Random();
//String randomWord = words.get(r.nextInt(words.size()));
Collections.shuffle(words);
String randomWord = words.get(1);
return randomWord;
}
同样,您应该正确填充words
字段:
public void readFile() throws FileNotFoundException {
words = new ArrayList<String>();
while (file.hasNext())
words.add(file.nextLine());
}
尝试这个。 您不需要在 main 中使用 getWord() 方法。 此外,为该类创建一个构造函数:
public TextFile() {
}
您的 openFile() 方法不需要返回字符串。
private void openFile() {
try {
file = new Scanner(new File("words.txt"));
} catch (FileNotFoundException e) {
System.out.println("File Not Found");
} catch (Exception e) {
System.out.println("IOEXCEPTION");
}
}
这是您的 readFile() 方法:1)读取文件 2)将一行单词拆分为每个单词并将其放入数组 3)然后,随机单词
public void readFile() throws FileNotFoundException {
// List<String> wordList = new ArrayList<String>();
while(file.hasNext()){
String line = file.nextLine(); //read file one line at a time
String[] parseWords = line.split(" "); //Parse what you read
int index = new Random().nextInt(parseWords.length);
String randW = parseWords[index];
System.out.println(randW);
}
}
在您的主要方法中:
TextFile file1 = new TextFile ();
file1.openFile();
file1.readFile();
file1.closeFile();
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