Question

public static void main(String[] args) {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        int charCount = 0;
        int wordCount = 0;
        int lineCount = 0;

        String line;
        try {
            while( (line = in.readLine()) != null ) {
                System.out.println(line);
                lineCount++;
                charCount += line.length();
                String[] words = line.split("\\W");
                wordCount += words.length;
            }
            System.out.println("charCount = " + charCount);
            System.out.println("wordCount = " + wordCount);
            System.out.println("lineCount = " + lineCount);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

直截了当：如何退出上述while循环？我已经阅读了另一个问题，当没有剩余的行要读取时，readLine（）返回null，但是如何使用Eclipse的控制台呢？

我能设法打破循环的唯一方法是添加案例，例如

if(line.length() == 2 || line.equals("exit")))
  break;

Answer 1

如果您只是想读一行，为什么还需要while循环？或者如果你想要多个输入，那么你应该指定在第一个readline（）中输入多少输入; 否则我希望下面的代码将解决您的问题：）

公共类TestRandomArray {

public static void main(String[] args) {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    int charCount = 0;
    int wordCount = 0;
    int lineCount = 0;

          try {
            String line = in.readLine();
            lineCount++;
            charCount += line.length();
            String[] words = line.split(" ");
            wordCount += words.length;
            System.out.println("charCount = " + charCount);
            System.out.println("wordCount = " + wordCount);
            System.out.println("lineCount = " + lineCount);
         in.close();
              } catch (IOException e) {
        e.printStackTrace();
    }
}

}

如何使用Eclipse为BufferedReader的readLine（）方法提供null

1 个答案: