Question

在我的while循环中，我在“+ =”下遇到语法错误。我去了这里，但答案对我没有帮助 Cumulative sum of an Array

我只是想打印从服务器流式传输的每个累积总和。

  public static void main(String[] args) {

    try
    {
        //Create client socket, connect to server
        Socket clientSocket = new Socket("localhost",9999);
        //create output stream attached to socket
        PrintStream outToServer = new PrintStream(clientSocket.getOutputStream());

        System.out.print("Command : ");
        //create input stream
        InputStreamReader inFromUser = new InputStreamReader(System.in);
        BufferedReader ed = new BufferedReader(inFromUser);

        String temp = ed.readLine();

        outToServer.println(temp);
        //create input stream attached to socket
        BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));

        String display=null;
        while((display = inFromServer.readLine())!=null){
        int displayByt = Integer.valueOf(display);
        double totalByt += displayByt;//SYNTAX ERROR  "+="
          //totalByt = totalByt + displayByt; Does not Work either
        System.out.print(totalByt);
        System.out.print("\n");
        }
        clientSocket.close();
    }

Answer 1

您应该在循环之前定义并初始化totalByt，并且只在循环中添加它，而不是尝试重新定义它：

double totalByt = 0.0; // Defined and initialized here
while ((display = inFromServer.readLine()) != null) {
    int displayByt = Integer.valueOf(display);
    totalByt += displayByt; // Used here
}

Answer 2

在循环之前移动totalByt的声明和初始化。在循环中增加它。并显示System.out.println而不是两次调用print。像，

double totalByt = 0; // <-- declare and set to 0.
while((display = inFromServer.readLine())!=null){
    int displayByt = Integer.valueOf(display);
    totalByt += displayByt;
    System.out.println(totalByt);
}

Answer 3

我认为这里唯一的问题是你的totalByt变量需要一个初始值。基本上你的代码编写方式，你试图将整数添加到任何东西。

试试这个：

String display=null;
double totalByt = 0;
while((display = inFromServer.readLine())!=null){

    int displayByt = Integer.valueOf(display);
    totalByt += displayByt;

    System.out.print(totalByt);
    System.out.print("\n");
}

Answer 4

初始化totalByt。这应该可以解决问题。

Java增量问题

4 个答案: