Question

当我按下时，有人可以解释如何输入结束。因为我只是一个初学者，所以无需按下输入并计算长度而没有太多高级的东西。

class UserInput//defines class
{//class begins
    public static void main (String[] args) throws IOException
    {//main method begins
        BufferedReader bf = new BufferedReader(newInputStreamReader(System.in));


        //tells the user what the program does
        System.out.println("This program will give you the total number of inputed characters."); 

        // tells the user how to end the program
        System.out.println("To obtain your final number of characters, enter .");       

        System.out.println("");

        //tells user to type in characters
        System.out.println("Enter any characters you want:");
        String input = bf.readLine(); //reads the user input and initializes input


        //initialize and declares variables
        int length = 0;
        length = length + anything.length();

        //outputs total number of characters
        System.out.println("The total number of characters input is " + length);
    }//main method ends
}//class ends

Answer 1

尝试使用System.in.read()通过char读取char。如果这不适用于您的平台，请参阅Why can't we read one character at a time from System.in?

Answer 2

使用“。”结束命令不是惯例。在命令行程序上。我建议您使用输入或制作图形用户界面，在使用文档侦听器或等效文件将其键入textarea时对字母进行计数。 GUI解决方案现已在此处提供：sample project showing it working。

Answer 3

您可以尝试这样的事情：

Scanner input = new Scanner(System.in);
int totalChars = 0;
// start an endless loop, constantly reading the next entered char from the user
while (true) {
    String next = input.next();
    if (".".equals(next)) {
        // when the user enters ".", exit the loop and stop reading
        input.close();
        break;
    } else {
        // otherwise, just increment the total chars counter
        totalChars++;
    }
}
System.out.println("Total characters: " + totalChars);

基本思想是继续通过char读取char，直到用户选择以＆＃34;来终止。＆＃34;命令。我建议您将BufferedReader替换为Scanner。 Scanner类更适合阅读用户输入，提供更自然且易于使用的界面，并将帮助您充分实现目标。

我需要制作一个结束输入的程序，并在我按下时计算行的总长度

3 个答案: